cdl_study_guide_book_3.of.3

Question 1

Question:
1. What is the best way to tell if your trailer has started to skid?

• Seeing it in the mirror
• Feeling for the pulling in the cab
• Hearing the wheels skidding

Answer 1

Seeing it in the mirror

Question 2

Question:
2. When inspecting the landing gear after uncoupling the trailer, where should the tractor be?
- Completely clear of the trailer
- With the tractor frame under the trailer
- The fifth wheel directly under the kingpin

Answer 2

With the tractor frame under the trailer

Question 3

Question:
3. There are two things the driver can do to prevent roll-over - keeping the cargo as close to the ground as possible and…?
- Going slow around turn
- Making suer the vehicle brakes are properly adjusted
- Keeping the fifth wheel free play as tight as possible

Answer 3

Going slow around turn

Question 4

Question:
4. After locking the king pin into the fifth wheel, how can you check the connection?
- Pull the tractor ahead gently with the trailer brake locked
- Pull forward 50 feet, then turn right and left
- Pull the tractor ahead sharply to release the trailer brake

Answer 4

Pull the tractor ahead gently with the trailer brake locked

Question 5

Question:5. If you have a semi-trailer, where should you put the front trailer that support it before driving away?

• Raised halfway with the crack handle secured in its bracket
• Fully raised with the crack handle secure in its bracket
• None of the above

Answer 5

Fully raised with the crack handle secure in its bracket

Question 6

Question:6. The safest way to turn right from a two-way road is…?

• Turning wide as you complete the turn
• Turning wide as before starting the turn
• Backing up if there are vehicles in that lane if you have to cross to the opposing lane

Answer 6

Turning wide as you complete the turn

Question 7

Question:7. While uncoupling, you should disconnect the electrical cable and…?

• Coil it to keep it out of the way
• Hang it with the plug down
• Hang it with the plug up

Answer 7

Hang it with the plug down

Question 8

Question:8. More than half of truck drivers deaths is as a results of…?

• Speed
• Following too closely
• Roll-Overs

Answer 8

Roll-Overs

Question 9

Question:9. Low-slung vehicles can be risky at railroad crossings because…?

• They may take longer to stop
• They are more likely to get stuck on a railroad crossing
• They are more likely to jackknife on the uneven ground

Answer 9

They are more likely to get stuck on a railroad crossing

Question 10

Question:10. Which of the following is true regarding the use of drugs when it come to driving?

• Prescription or non-prescription drugs are not allowed for any reason
• Prescription drugs are allowed as long as the doctor say it will not affect your driving ability
• Speed is allowed as long as you are taking drugs to stay awake

Answer 10

Prescription drugs are allowed as long as the doctor say it will not affect your driving ability

Question 11

Question:11. Once of the following statements is true about tires in hot weather?
- You should inspect your tires every two hours or every 100 miles when driving in very hot weather
- You should check tire mounting and air pressure before driving
- You should bleed a small amount of air to keep tire pressure steady

Answer 11

You should inspect your tires every two hours or every 100 miles when driving in very hot weather

Question 12

Question:12. Some suspension system defect are…?
- Leaking shock absorbers
- Broken leave in a leaf spring and a cracked spring hanger
- All of the above

Answer 12

All of the above

Question 13

Question:13. If the trailer has an Antilock Braking System but the tractor doesn’t, what is likely to happen?
- The trailer is likely to swing out
- The trailer is still less likely to swing out
- None of the above

Answer 13

The trailer is still less likely to swing out

Question 14

Question:14. When you are pulling doubles or triples, the shut-off-valves should always be…?
- Open, except for those on the last trailer
- Open
- Open, except for those on the first trailer

Answer 14

Open, except for those on the last trailer

Question 15

Question:15. After connecting the air lines but before backing under the trailer, one should…?
- Make sure that the trailer brakes are off
- Supply air to the trailer system and then pull out the air supply knob
- Walk around the rig to make sure that it is clear

Answer 15

Supply air to the trailer system and then pull out the air supply knob

Question 16

Question:16. What is crack-the-whip effect according to one of these statements?
- The rearmost trailer will sing out the most and will be more likely to roll over
- If a sudden movement is made from your steering wheel, the tractor will tend to rock and sway
- When your trailer is half full and loaded in the front of the trailer, sudden movement of your steering wheel will cause your cargo to slide

Answer 16

The rearmost trailer will sing out the most and will be more likely to roll over

Question 17

Question:17. If your vehicle gets stuck on a railroad track, you should…?
- Get away from your vehicle and call 911
- Radio in for assistance
- Honk the horn loudly and call 911

Answer 17

Get away from your vehicle and call 911

Question 18

Question:18. Before uncoupling you should…?
- Call in for any special request
- Make sure your vehicle is parked on a level surface, the ground is solid and can support the weight of the trailer
- Make sure the trailer has enough air supply for the brakes to hold

Answer 18

Make sure your vehicle is parked on a level surface, the ground is solid and can support the weight of the trailer

Question 19

Question:19. Combination vehicles take longer to stop when they are empty because…?
- There is less traction
- You are likely to brake as hard
- The center of gravity is lower

Answer 19

There is less traction

Question 20

Question:20. If you must drive on slippery roads, what is a good thing to do in such situation…?
- Slow down gradually
- Use smaller following following distance
- Apply brakes during turns
- None of the above

Answer 20

Slow down gradually

Question 21

Question:21. One can confirm if air is going to all brakes in the trailer by…?
- Opening the emergency line shut off-valves at the rear of the last trailer and listening for air escaping
- Opening the emergency line shut-off valves and the service line valve at the rear of the last trailer and listening for air escaping each time
- Confirming that the air pressure is at normal level.

Answer 21

Opening the emergency line shut-off valves and the service line valve at the rear of the last trailer and listening for air escaping each time

Question 22

Question:22. To prevent a roll-over, cargo should be…?
- Spread evenly across the rig as low as possible
- Stacked closet to the door
- Stacked as close to the front of the rig as possible

Answer 22

Spread evenly across the rig as low as possible

Question 23

Question:23. When testing ONLY the trailer service brake, which of the options below about the air valves is correct?
- Parking Brake: push in; Trailer air supply: in/open
- Parking Brake: push in; Trailer air supply: out/closed
- Parking Brake: pull out: Trailer air supply: out/closed

Answer 23

Parking Brake: pull in: Trailer air supply: in/open

Question 24

Question:24. How should you test the tractor-trailer connection for security?
- Pull gently forward in lower gear against the locked trailer brakes, then inspect the coupling
- Rock the trailer back and forth with the trailer brakes locked
- Put the tractor in gear and pull ahead with a sharp jerk

Answer 24

Pull gently forward in lower gear against the locked trailer brakes, then inspect the coupling

Question 25

Question:25. You should not use the trailer hand valve while driving because...? - You should only use the parking brake - Of the danger of making the trailer skid - It wont work as well as the foot brake

Answer 25

Of the danger of making the trailer skid

Question 26

Question:26. The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than _____ psi per minute? - 2 - 3 - 4

Answer 26

4

Question 27

Question:27. Why should you lock the tractor gladhands to each other or to the storage bracket when you are not towing a trailer? - Because the connected brake circuit becomes a backup air tank - Because it will keep dirt and water out of the lines - Because if you do not, you can never build system pressure

Answer 27

Because it will keep dirt and water out of the lines

Question 28

Question:28. The hand valve should be used...? - Only with the foot brake - To test the trailer brakes - Only when the trailer is fully loaded

Answer 28

To test the trailer

Question 29

Question:29. If the brakes do not release when you push the trailer air supply valve, you should...? - Check the electrical cabin - Cross the air lines - Check the air line connections

Answer 29

Check the air line connections

Question 30

Question:30. In general, the higher your truck's center of gravity, the...? - Easier it is to turn over - Easier it is to turn around corners - More stable it is when turning

Answer 30

Easier it is to turn over

Question 31

Question:31. When you test the tractor protection valve, the red air supply control knob should go into the _____________ position? - Emergency - Normal - Neutral

Answer 31

Emergency

Question 32

Question:32. When the front trailer supports are raised, and the trailer is resting on the tractor, you should make sure that...? - There is enough clearance between the tops of the tractor tires and the nose of the trailers - There is enough clearance between the tractor frame and the landing gear - Both answer are correct

Answer 32

Both answer are correct

Question 33

Question:33. To test the tractor protection valve, charge the trailer air bake system, turn off the engine, and...? - Keep pressing the brake pedal firmly - Flash your high-beam headlights on and off several times - Step on and off the brake pedal server times

Answer 33

Step on and off the brake pedal server times

Question 34

Question:34. One of these vehicles off-tracks the most? - A 5-Axl tractor towing a 45-foot trailer - A 5-Axl tractor towing a 42-foot trailer - A 5-Axl tractor towing a 52-foot trailer

Answer 34

A 5-Axl tractor towing a 52-foot trailer

Question 35

Question:35. Describe what the trailer air supply control does? - It is a device used to keep the trailer behind the tractor - It is six-sided yellow knob used to control the tractor protection valve - It is used to supply the trailer with air, shut the air off, and apply the trailer emergency brakes

Answer 35

It is used to supply the trailer with air, shut the air off, and apply the trailer emergency brakes

Question 36

Question:36. Why should you connect the glad hands to the dummy couplers if your vehicle is equipped with them? - It will keep dirt and water out of the lines - If you don't, you will never build system pressure - The connected brake circuit becomes a backup air tank

Answer 36

It will keep dirt and water out of the lines

Question 37

Question:37. In what position should the tractor protection valve control be placed in order to test the trailer air brakes when coupling a tractor-semitrailer? - Up - Down - Normal

Answer 37

Normal

Question 38

Question:38. Trucks roll-over more easily when fully loaded and are...? - Five times more likely to roll over during a crash than empty rigs - Two times more likely to roll over during a crash than empty rigs - Ten times more likely to roll over during a crash than empty rigs

Answer 38

Ten times more likely to roll over during a crash than empty rigs

Question 39

Question:39. If the driver crosses the air lines when hooking up to an old trailer, what will happen? - You can drive away if the trailer has no spring brakes, but you will not have trailer brakes - Instead of the trailer brakes, the hand valve will apply the tractor brakes - Instead of the air brakes, the brake pedal will work the trailer spring brakes

Answer 39

You can drive away if the trailer has no spring brakes, but you will not have trailer brakes.

Question 40

Question:40. Why should you be sure that the fifth wheel plate is greased as required? - To ensure good electrical connections - To prevent steering problems - To reduced head and noise

Answer 40

To prevent steering problems

Question 41

Question:41. What is a tractor jackknife? - When the driver tires on the tractor get locked up and the tractor spins out sideways as the trailer continues pushing forward - When the driver tries on the trailer get locked up and the trailer spins out sideways as the tractor continues pushing forward - Neither of the above

Answer 41

When the driver tires on the tractor get locked up and the tractor spins out sideways as the trailer continues pushing forward

Question 42

Question:42. After you have uncoupled the trailer and are inspecting the trailer supports, in what gear should the tractor engine be? - Neutral - High reverse - Low reverse

Answer 42

Neutral

Question 43

Question:43. You should line up ______ as you get ready to back under the semi-trailer? - About 15 degrees away from the line of the trailer - So that the king pin engages the driver's side licking jaw first - Directly in front of the trailer

Answer 43

Directly in front of the trailer

Question 44

Question:44. During uncoupling, you should disengage the electrical cable and...? - Coil it to keep it out of the way - Hang it with the plug down - Hang it with the plug

Answer 44

Hang it with the plug down

Question 45

Question:45. You should line up ____ as you get ready to back up the semi-trailer? - Connect the air lines before backing under the trailer - Back under the trailer before connecting the air lines - Make sure the trailer brakes are locked

Answer 45

Make sure the trailer brakes are locked

Question 46

Question:46. How should you test the tractor-semitrailer connection for security? - Rock the trailer back and forth with the trailer brakes locked - Pull gently forward in low gear against the locked trailer brakes then look at it carefully - Look at it carefully

Answer 46

Pull gently forward in low gear against the locked trailer brakes then look at it carefully

Question 47

Question:47. You are coupling a tractor to a semitrailer and have backed up, but are not under it. What should you hook up before backing under? - The electrical service cable - The emergency and service air lines - Nothing, back up and lock the fifth wheel

Answer 47

The emergency and service air lines

Question 48

Question:48. To test the trailer brakes before driving, use the hand valve or the ______________? - Service brakes - Parking brake valve - Emergency spring brake valve - Tractor protection valve

Answer 48

Tractor protection valve

Question 49

Question:49. The spring brakes of a tractor will come on when the air pressure falls within _________? - 60-75 psi - 20-45 psi - 50-55 psi - 100-125 psi

Answer 49

20-45 psi

Question 50

Question:50. Air and electrical lines from the tractor to the trailer should be ________________? - Fully tight but away a little looped - Resting on the frame of the tractor - Secured but with enough loop to turn

Answer 50

Secured but with enough loop to turn

Question 51

Question:51. You are coupling a tractor to the semitrailer; you have connected the airlines. Before backing under the trailer. you should ________________? - Pulled ahead to test the glad hands connection - Supply air to the trailer system knob - Make sure that the trailer brakes are off

Answer 51

Supply air to the trailer system knob

Question 52

Question:52. There are two types of jackknife, they are ______________? - Both trailer and tractor - Tractor - Trailer

Answer 52

Both trailer and tractor

Question 53

Question:53. The tractor should be positioned to back under the trailer___________? - At a 90 degree angle - At a 45 degree angle - Straight Back - In whatever position is convenient

Answer 53

Straight Back

Question 54

Question:54. When uncoupling the trailer, after you shut off the trailer air supply and lock the trailer brakes, you should _____________? - Put on you tractor parking brakes - Back up gently to ease pressure on the fifth wheel - Lower trailer landing gear

Answer 54

Back up gently to ease pressure on the fifth wheel

Question 55

Question:55. When coupling, the proper position of the fifth wheel is __________________? - Tilted up toward the end of the trailer - Tilted down toward the end of the trailer - Level ground

Answer 55

Tilted down toward the end of the trailer

Question 56

Question:56. What happens if the emergency air line breaks or becomes disconnected while driving? - The trailer supply valve will open - The trailer emergency brakes will engage - The air compressor will unload instead of pumping air

Answer 56

The trailer emergency brakes will engage

Question 57

Question:57. In the event of brake or disconnection in the emergency air line while driving a combination vehicle, what consequences can be expected? - Nothing significant will occur until the application of the service brakes - The tractor emergency brakes will engage - The trailer emergency brakes will engage

Answer 57

The trailer emergency brakes will engage

Question 58

Question:58. Among the following vehicles, which one will have the greatest off-tracking of the rear wheel? - A bobtail tractor - A 3-axel tractor towing two 27-foot trailers - A 3-axel trailer towing one 45-foot trailer

Answer 58

A 3-axel tractor towing two 27-foot trailers

Question 59

Question:59. When examining the connectivity between the rear trailer and the front trailer, ensure that the landing gear is ____________? - partially elevated - completely elevated - fully elevated

Answer 59

partially elevated

Question 60

Question:60. When uncoupling a loaded trailer, lower the landing gear until it reaches a specific point. What is that point? - Lower the landing gear until it makes firm contact with the ground - Lower the landing gear until it makes firm contact with the ground and slightly lifts the trailer off the fifth wheel - Lower the landing gear until it reaches the ground

Answer 60

Lower the landing gear until it makes firm contact with the ground

Question 61

Question:61. Glad hands are used to connect the ________________? - Service and emergency air lines from the truck or tractor to the trailer - Electrical lines from the tractor to the trailer - Kingpin from the trailer to the locking jaws of the fifth wheels

Answer 61

Service and emergency air lines from the truck or tractor to the trailer

Question 62

Question:62. What is the importance of ensuring proper greasing of the fifth wheel plate? - To prevent steering complications - To minimize levels of heat and noise - To ensure optimal electrical connections

Answer 62

To prevent steering complications

Question 63

Question:63. During normal driving, some drivers employ the hand valve prior to to using the brake pedal in order to prevent a jackknife. Which of the following statements is accurate? - It leads to reduced skidding compared to using the brake pedal alone. - It is the most effective method to brake and maintain vehicle alignment - It should not be practiced

Answer 63

It should not be practiced

Question 64

Question:64. How can you determine if your vehicle is equipped with antilock braking systems (ABS)? - Apply the brakes on a slippery road and check it the wheels lock. - Inspect underneath the vehicle for the location of the ECU and wheel speed sensor wiring from the brake assembly - Inspect underneath the vehicle for the presence of an ABS test light

Answer 64

Inspect underneath the vehicle for the location of the ECU and wheel speed sensor wiring from the brake assembly

Question 65

Question:65. What happens when there is a loss of air pressure in the emergency line? - The air pressure in the service line will increase - The relay valves will close - The trailers emergency brakes will engage

Answer 65

The trailers emergency brakes will engage

Question 66

Question:66. You have a major leak in the service line, and you apply the brakes. Service air pressure will escape and cause the ____________? - Trailer tank pressure to be lost - Tractor spring brakes to lock on - Trailer emergency brakes to come on

Answer 66

Trailer emergency brakes to come on

Question 67

Question:67. While attaching your tractor to a trailer, you have pressed the trailer supply valve. Before moving the tractor, what should be the status of the whole air brake system? - Completely empty - Between 60 and 80 psi - At regular pressure

Answer 67

At regular pressure

Question 68

Question:68. The stopping distance of a combination vehicle is longest when it is _____________? - nearly fully loaded - empty - fully loaded

Answer 68

empty

Question 69

Question:69. How should you test the tractor-semitrailer connection for security? - Gently pull forward in low gear against the locked trailer brakes; then look at it carefully - Rock the trailer back and forth with the trailer brakes locked - Put the tractor in gear and pull ahead with a sharp jerk

Answer 69

Gently pull forward in low gear against the locked trailer brakes; then look at it carefully

Question 70

Question:70. When turning right from a two-lane, two-way street onto another. what is the recommended path if your truck is long to turn without swinging wide? - Path B - Path A - Path C

Answer 70

Path B

Question 71

Question:71. How can you supply air to the trailer tanks? - You can supply air to the trailer tanks by connecting the service line glad hand - You can supply air to the trailer tanks by pushing in the trailer air supply control - You can supply air to the trailer tanks by pulling out the trailer air supply control

Answer 71

You can supply air to the trailer tanks by pushing in the trailer air supply control

Question 72

Question:72. How can you confirm that air is reaching all brakes in your trailers? - Verify that the air pressure is within normal levels - Open the emergency line shut-off valve at the rear of the last and listen for the sound of air escaping - Alternate opening the emergency line shut-off valve and the service line valve at the rear of the last trailer while listening for the sound of air escaping each time.

Answer 72

Alternate opening the emergency line shut-off valve and the service line valve at the rear of the last trailer while listening for the sound of air escaping each time.

Question 73

Question:73. Under good driving conditions, you should leave at least one second of the following distance behind the vehicle ahead of you for every ________ feet of your vehicle's length? - 30 - 20 - 10

Answer 73

10

Question 74

Question:74. Which of these vehicles exhibits the most off-tracking? - A 5-axle tractor towing a 42-foot trailer - A 5-axle tractor towing a 45-foot trailer - A 5-axle tractor towing a 52-foot trailer

Answer 74

A 5-axle tractor towing a 52-foot trailer

Question 75

Question:75. How should you check for crossed air lines after supplying air to the trailer during the coupling procedure? - Check the dashboard air pressure gauges to ensure they show normal pressures - Apply and release the trailer service brakes while listening for any sounds - Apply the trailer parking brakes while listening for any sound

Answer 75

Apply and release the trailer service brakes while listening for any sounds

Question 76

Question:76. When preparing to drive away after coupling with semi-trailer, what should the position of the front trailer supports? - The front trailer supports should be raised halfway with the crank handle secured in it bracket - The front trailer support should be raised three-quarters of the way with the crank handle removed - The front trailer support should be fully raised with the crank handle secured in its bracket

Answer 76

The front trailer support should be fully raised with the crank handle secured in its bracket

Question 77

Question:77. In the event of a trailer skid, should you engage the trailer hand brake? - Yes, as the trailer hand brake aids in recovering from the skid - Yes, as the trailer hand brake can diminish the risk of a rollover but may not entirely halt the skid - No, since the skid was initially caused by the brakes on the trailer wheels - It relies on the speed at which you were traveling initially. Activate the hand brake if you were driving above the speed limit

Answer 77

No, since the skid was initially caused by the brakes on the trailer wheels

Question 78

Question:78. As part of the vehicle inspection test, when inspecting the air connections between the truck/tractor and the trailer, it is important to check that the __________ are properly secured and free from any harm or air leakage? - Lug nuts - glad hands - pins

Answer 78

glad hands

Question 79

Question:79. When hauling double or triple trailers, it is necessary to keep the shut-off valves? - Open except for those on the last trailer - open - open except for those one the first trailer

Answer 79

Open except for those on the last trailer

Question 80

Question:80. What is the acceptable air leakage rate for a combination vehicle with the engine off and the service brakes released? - The air pressure should not drop more than 4 psi per minute - The air pressure should not drop more than 3 psi per minute - The air pressure should not drop more than 2 psi per minute

Answer 80

The air pressure should not drop more than 3 psi per minute

Question 81

Question:81. A trailer is at a higher risk of jackknifing when it is ________________? - empty - overloaded - fully loaded

Answer 81

empty

Question 82

Question:82. If the test of the tractor protection valve proves successful, _________________? - The tractor protection valve control (trailer air supply control) will pop out or switch from "normal" to "emergency" - the parking brake valve will pop out - the low air pressure warning signal will illuminate

Answer 82

The tractor protection valve control (trailer air supply control) will pop out or switch from "normal" to "emergency"

Question 83

Question:83. What are the alternative terms used to refer to the service air line? - The service air line is also known as the curved line and signal line - The service air line is also known as the straight line and signal line - The service air line is also known as the control line and signal line

Answer 83

The service air line is also known as the control line and signal line

Question 84

Question:84. The tractor protection valve is designed to automatically close when the air pressure falls within the manufacturer's specified ____________________? - range of 50 to 75 psi - range of 75 to 100 psi - range of 20 to 45 psi

Answer 84

range of 20 to 45 psi

Question 85

Question:85. What should be the distance between the upper and lower fifth wheel after coupling? - Approximately 1/4 inch - None at all - Just enough to see light pass through it

Answer 85

none at all

Question 86

Question:86. You cross the air lines when hooking up to an old trailer. What will happen? - In the absence of spring brakes on the trailer, it is possible to drive, albeit without functional trailer brakes - The hand valve will activate the tractor brakes rather than the trailer brakes - Depressing the brake pedal will trigger the activation of the brake lights

Answer 86

In the absence of spring brakes on the trailer, it is possible to drive, albeit without functional trailer brakes

Question 87

Question:87. Over 50% of fatalities among truck drivers are attributable to __________? - excessive speed - rollovers - following other vehicles too closely

Answer 87

rollovers

Question 88

Question:88. In order to prevent a skid while towing a trailer, the recommended action is to _____________? - counter steer the vehicle - utilize the brakes on the trailer - release the brakes on the vehicle

Answer 88

release the brakes on the vehicle

Question 89

Question:89. What is the estimated duration for a typical tractor-trailer to clear a single railroad track? How about a double track? - It take around 10 seconds to clear a single track and more than 12 seconds to clear a double track - It take roughly 14 seconds to clear a single track and more than 15 seconds to clear a double track - It take roughly 7 seconds to clear a single track and more than 10 seconds to clear a double track

Answer 89

It take roughly 14 seconds to clear a single track and more than 15 seconds to clear a double track

Question 90

Question:90. In a double or triple vehicle, which wheels experience that greatest amount of off-tracking? - The wheels located at the rear end of the tractor - The wheels positioned at the back of the last trailer - The wheels on the front trailer

Answer 90

The wheels positioned at the back of the last trailer

Question 91

Question:91. When not towing a trailer it is important to connect the tractor glad hands to each other because? - It ensures adequate tank pressure is built - This prevents dirt and water from entering the lines - The connected brake circuit can serve as a backup air source

Answer 91

This prevents dirt and water from entering the lines

Question 92

Question:92. You are operating a combination vehicle and apply the service brakes. However, there is a significant leak in the service air line. If the air pressures continue to drop,__________________? - The emergency brakes on the trailer will engage - All air within the trailer's air tanks will be lost - The emergency brakes on the tractor will engage

Answer 92

The emergency brakes on the trailer will engage

Question 93

Question:93. To disengage the fifth wheel lock, in which position should the release handle be pulled? - To disengage the fifth wheel lock, pull the release handle to the neutral position - To disengage the fifth wheel lock, pull the release handle to the closed position - To disengage the fifth wheel local, pull the release handle to the open position

Answer 93

To disengage the fifth wheel local, pull the release handle to the open position

Question 94

Question:94. Why is it imperative to adequately lubricate the fifth wheel plate? - To prevent steering complications - To minimize wear and tear on the fifth wheel - To reduce noise levels

Answer 94

To prevent steering complications

Question 95

Question:95. The air leakage rate for a combination vehicle with the engine off and the service brakes on should not exceed? - 4 psi per minute - 2 psi per minute - 3 psi per minute

Answer 95

4 psi per minute

Question 96

Question:96. Are you advised to exit your vehicle before backing a combination vehicle? - No, it is strongly discouraged - Yes, particularly when uncertain about the intended path of travel - Yes, but only if your trainer begins drifting towards the passenger side

Answer 96

Yes, particularly when uncertain about the intended path of travel

Question 97

Question:97. What is a clear example of the "crack-the-whip" effect? - Imagine a scenario where your trailer is half full and the cargo is loaded in the front. If you make a sudden steering adjustment, the cargo will slide to the back causing the trailer to roll over - If you execute a sudden steering maneuver or change lanes abruptly, the tractor will experience rocking and swaying. As a result of the rearmost trailer's velocity, the tractor will roll over before the trailers do - When you make sudden steering movement or perform a quick lane change, your trailers will tend to swing out. The rearmost trailer will swing out the most and have the highest chance of rolling over.

Answer 97

When you make sudden steering movement or perform a quick lane change, your trailers will tend to swing out. The rearmost trailer will swing out the most and have the highest chance of rolling over.

Question 98

Question:98. During the coupling process of tractor-semitrailer, what position should the tractor protection valve control be in to test the trailer air brakes? - Down - Up - Normal

Answer 98

Normal

Question 99

Question:99. Where can the shut-off valves on the trailer be found? - They are located at the rear of the trailer - They are positioned at the front of the trailer - They can be found on the side of the trailer

Answer 99

They are located at the rear of the trailer

Question 100

Question:100. The locking jaws of the fifth wheel should close around the ______________? - Head of the kingpin - Shank of the kingpin - base of the kingpin

Answer 100

Shank of the kingpin

Question 101

Question:101. A tractor paired with an ______________ trailer requires the shortest distance to come to a stop? - Empty - Lightly loaded - Fully loaded

Answer 101

Fully loaded

Question 102

Question:102. While attaching a trailer to a tractor, it is necessary to connect the emergency air line to _________________? - The trailer's service glad hand - The trailer's service shut-off valve - The trailer's emergency glad hand - The trailer's emergency shut-off valve

Answer 102

The trailer's emergency glad hand

Question 103

Question:103. Can you explain the function of the trailer air supply control? - It supplies air to the trailer, enables air cutoff, and activates the trailer emergency brakes - It ensures the trailer remains connected to the back of the tractor - It is a yellow knob used to control the tractor's protection valve

Answer 103

It supplies air to the trailer, enables air cutoff, and activates the trailer emergency brakes

Question 104

Question:104. Using the trailer hand valve while driving is not recommended because ______________? - The parking brake should be used instead - It does not have the same effectiveness as the foot brake - It can lead to the trailer skidding

Answer 104

It can lead to the trailer skidding

Question 105

Question:105. What should you do after connecting the air lines but before backing under the trailer? - Perform a walk-around inspection to ensure clearance - Ensure that the trailer brakes are disengaged - Supply air to the trailer system and then activate the air supply knob

Answer 105

Supply air to the trailer system and then activate the air supply knob

Question 106

Question:106. During your inspection, ensure that the air and electrical lines connection the tractor and the trailer are properly positioned? - The air and electrical lines should be secured but with enough slack to accommodate turns - The air and electrical line should be pulled tight with minimal slack - The air and electrical lines should be resting on the tractor's frame

Answer 106

The air and electrical lines should be secured but with enough slack to accommodate turns

Question 107

Question:107. Among the following combinations of vehicles, which one is most prone to rolling over when making a turn? - A triple 27-foot trailer - A double 45-foot trailer - A 45-foot trailer and a 27-foot trailer

Answer 107

A triple 27-foot trailer

Question 108

Question:108. You are coupling a trailer to a tractor. What do you check when making a visual check of the coupling? - Landing gear, trailer height, and upper and lower fifth wheel - Upper and lower fifth wheel, air lines, and electrical lines - Tires, landing gear, and trailer damage - Air lines, electrical line, and trailer height

Answer 108

Upper and lower fifth wheel, air lines, and electrical lines

Question 109

Question:109. If there is a major leak in the brake line, the tractor protection valve will close and the trailer _____________ brakes will come on. - Service - Emergency - Parking

Answer 109

Emergency

Question 110

Question:110. The fifth wheel locking lever has not been engaged after the jaws have closed around the kingpin. Consequently, ____________? - The parking lock is disengaged, and driving can commence - The trailer will not pivot on the fifth wheel - The connection is not proper and needs to be rectified prior to driving the coupled unit.

Answer 110

The connection is not proper and needs to be rectified prior to driving the coupled unit.

Question 111

Question:111. Which statement is accurate? - Bobtail tractors may have longer stopping distances compared to fully loaded combination vehicles - Combination vehicles are designed to function optimally with a light load - Light vehicles require more braking power than heavy vehicles to come to a stop

Answer 111

Bobtail tractors may have longer stopping distances compared to fully loaded combination vehicles

Question 112

Question:112. Upon locking the kingpin into the fifth wheel, what procedure should be followed to ensure the connection is secure? - Gently pull the tractor forward with the trailer brakes locked - Pull forward approximately 50 feet, followed by a series of right and left turns - Pull the tractor forward abruptly to disengage the trailer brakes

Answer 112

Gently pull the tractor forward with the trailer brakes locked

Question 113

Question:113. After coupling, verify that the air lines are not crossed. How can this be accomplished? - Adjust the air supply knob to direct air to the trailer brakes, then check if the air pressure normalizes - Adjust the air supply knob to direct air to the trailer brakes. Once the air pressure returns to normal, switch off the engine. Subsequently, listen for the sound of escaping air as the brakes are released - Switch off the engine and listen for the release of air as you engage the brakes

Answer 113

Adjust the air supply knob to direct air to the trailer brakes. Once the air pressure returns to normal, switch off the engine. Subsequently, listen for the sound of escaping air as the brakes are released

Question 114

Question:114. When abruptly changing direction while pulling double trailers, which trailer is most prone to tipping over? - All trailers have an equal likelihood of tipping over as the tractor - The front trailer is twice as susceptible to tipping over as the tractor - The rear trailer is twice as likely to tip over as the tractor

Answer 114

The rear trailer is twice as likely to tip over as the tractor

Question 115

Question:115. If the trailer is equipped with antilock braking system (ABS) while the tractor does not have them, _____________? - The probability of the trailer swaying out is reduced - the presence of ABS does not affect the likelihood of the trailer swaying out - The likelihood of the trailer swaying out increases

Answer 115

The probability of the trailer swaying out is reduced

Question 116

Question:116. If your vehicle is equipped with dummy couplers, why should you connect the glad hands to them? - Connecting the glad hands to dummy couplers prevents the entry of dirt and water into the lines - Connecting the glad hands to dummy couplers serves as means to establish a backup air circuit for the connected brake circuit - Failure to connect the glad hands to dummy couplers would result in the inability to build system pressure

Answer 116

Connecting the glad hands to dummy couplers prevents the entry of dirt and water into the lines

Question 117

Question:117. To uncouple a loaded trailer, once the landing gear is firmly on the ground, it is important to ____________? - Turn the crank a few more times until the trailer is raised off the fifth wheel - Gradually turn the crank to alleviate some weight from the tractor - Safely secure the crank handle

Answer 117

Gradually turn the crank to alleviate some weight from the tractor

Question 118

Question:118. You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking, you should _____________? - Maximize brake pedal pressure and maintain it until necessary - Exclusively utilize the trailer brakes - Employ controlled or stab braking techniques

Answer 118

Employ controlled or stab braking techniques

Question 119

Question:119. Once you have connected the air line to the trailer during the coupling process, what position should you place the tractor protection valve control in? - Normal - Up - Down

Answer 119

Normal

Question 120

Question:120. What are two measures that can be taken by a driver to prevent a rollover? Keep the cargo as clsoe to the ground as possible and _________________? - Minimize the free play of the fifth wheel - Ensure proper adjustment of the brakes - Navigate turns at a reduced speed

Answer 120

Navigate turns at a reduced speed

Question 121

Question:121. The trailer hand valve can be employed to test the functionality of the trailer brakes, but should not be used while driving without simultaneously engaging the foot brake. - Only when the trailer is fully loaded - To test the trailer brakes - Only with the foot brake

Answer 121

To test the trailer brakes

Question 122

Question:122. What should be done if a right turn cannot be made without merging into another traffic lane? - Initiate a wide turn before beginning the turn - Execute a wide turn as the turn is being completed - Identify an alternative location for the turn

Answer 122

Execute a wide turn as the turn is being completed

Question 123

Question:123. When inspecting the connection between the tractor and trailer, it is important to ensure that the trailer is securely attached. Additionally, the landing gear should be? - Lowered slightly - Raised slightly - Completely raised

Answer 123

Raised slightly

Question 124

Question:124. Before you begin the process of detaching the trailer from the tractor, it is essential to ________? - Request any specific requirement or instructions - Ensure that the ground beneath is stable and capable of supporting the trailer weight - Confirm that the trailer has an adequate air supply to maintain its brake functionality

Answer 124

Ensure that the ground beneath is stable and capable of supporting the trailer weight

Question 125

Question:125. After supplying air to the trailer, ensure the air lines are not crossed and that the trailer brakes are functional. This can be done by ________________? - Raising the brake pedal - Applying and releasing the trailer brakes while listening for brake sounds - Activating the parking brakes from the cab

Answer 125

Applying and releasing the trailer brakes while listening for brake sounds

Question 126

Question:126. During a test of the tractor protection valve, the red air supply control knob should be set to the _________________ position? - Neutral - Normal - Emergency

Answer 126

Emergency

Question 127

Question:127. In comparison to a straight truck or bus, how many inspection points are there in combination vehicles? - The same number of - More - Fewer

Answer 127

More

Question 128

Question:128. Why should the trailer hand valve not be used to correct a jackknifing trailer? - The skid of the trailer wheels is caused by the trailer brakes - It is challenging to reach and operate the brake handle - The trailer wheels do not respond to the hand valve

Answer 128

The skid of the trailer wheels is caused by the trailer brakes

Question 129

Question:129. To examine the tractor protection valve, charge the trailer air brake system, turn off the engine, and __________________? - Apply and release the brake pedal multiple times - Flash the high-beam headlights repeatedly - Maintain firm pressure on the brake pedal

Answer 129

Apply and release the brake pedal multiple times

Question 130

Question:130. What is purpose of the emergency air line? - To activate the front brakes of the tractor in emergency situations - To maintain additional air pressure for potential requirements - To engage the trailer brakes if there is a loss of air pressure

Answer 130

To engage the trailer brakes if there is a loss of air pressure

Question 131

Question:131. Which of the following statements is correct regarding heavy vehicles and braking? - "Bobtail" tractors may take longer to stop compared to a combination vehicle loaded to the maximum gross weight - Always delay braking a heavy vehicle until there are no other options available - Light vehicles require more braking power to stop compared to heavy vehicles

Answer 131

"Bobtail" tractors may take longer to stop compared to a combination vehicle loaded to the maximum gross weight

Question 132

Question:132. If there is a significant leak in the service line, the tractor protection valve will close and activate the trailer emergency brakes? - Control line - Service line - Emergency line

Answer 132

Emergency line

Question 133

Question:133. Once the trailer has been connected it is recommended to begin the process of lifting the landing gear using the appropriate gear range? - The high gear - An intermediate gear - The low gear

Answer 133

The low gear

Question 134

Question:134. What is mean by a tractor jackknife? - It happen when the wheels of the trailer lock, causing the trailer to spin out sideways while the tractor continues to push forward - It occurs when the drive wheels of the tractor lock, resulting in the tractor spinning our sideways while the trailer continues to push forward - Neither of the above

Answer 134

It occurs when the drive wheels of the tractor lock, resulting in the tractor spinning our sideways while the trailer continues to push forward

Question 135

Question:135. You are coupling a tractor to a semi-trailer. You have connected the air lines. Before backing under the trailer, you should? - Make sure that the trailers brakes are off - Supply air to the trailer system and then pull out the air supply knob - Pull ahead to test the glad hands connections

Answer 135

Supply air to the trailer system and then pull out the air supply knob

Question 136

Question: 136. You are coupling a semi-trailer to your tractor but have not yet backed under it. The trailer is at the right height if ____________? - The end of the kingpin is even with the top of the fifth wheel - It will be raised slightly when the tractor is backed under it - The kingpin is about 1.1/4 inches above the fifth wheel

Answer 136

It will be raised slightly when the tractor is backed under it

Question 137

Question: 137. To complete the coupling procedure, where should the safety latch for the fifth wheel locking lever be positioned? - On top of the locking lever - Passing through the locking lever - Directly over the locking lever

Answer 137

On top of the locking lever

Question 138

Question: 138. After connecting the trailer to the tractor, you should fully raise the landing gear of the trailer. Once the trailer's full weight is resting on the tractor, what should you inspect? - Sufficient clearance between the tops of the tractor tires and the nose of the trailer - Sufficient clearance between the ground and the tops of the tractor tires - Both A & C - Sufficient clearance between the landing gear and the rear of the tractor frame

Answer 138

Both A & C

Question 139

Question:139. When connecting a tractor to a trailer, it is recommended to _______________? - Always utilize the lowest reverse gear - Perform the task swiftly to ensure the kingpin is securely locked into the fifth wheel - Always approach the trailer at a slight angle

Answer 139

Always utilize the lowest reverse gear

Question 140

Question: 140. The trailer hand valve is responsible for operating the trailer brakes. Which of these statements accurately describe its function? - Both of these statements are correct - The foot brake supplies air to both the vehicles brakes - The trailer hand valve should only be used for testing the trailer brakes

Answer 140

Both of these statements are correct

Question 141

Question: 141. When attaching a tractor to a semi-trailer, what should be done before backing under the trailer? - Connect the emergency and service air lines - Hook up the electrical service cable - Nothing. Back up and lock the fifth wheel

Answer 141

Connect the emergency and service air lines

Question 142

Question: 142. In what situations should you use the trailer hand valve to park a combination vehicle? - When parking at loading docks - Never - When parking on grade

Answer 142

Never

Question 143

Question: 143. After uncoupling the trailer, where should the tractor be positioned when inspecting the landing gear? - Ensure the tractor frame is under the trailer - Ensure the fifth wheel is directly beneath the kingpin - Ensure the tractor is completely clear of the trailer

Answer 143

Ensure the tractor frame is under the trailer

Question 144

Question: 144. Why can low-slug vehicles be hazardous at railroads crossings? - They are more prone to getting stuck on raised railroad crossing - They are more susceptible to jackknifing on uneven terrain - They may have a longer stopping distance

Answer 144

They are more prone to getting stuck on raised railroad crossing

Question 145

Question: 145. Before positioning yourself beneath a trailer, it is crucial to verify that ______________? - The trailer brakes have been firmly locked - The air brakes have been deactivated - The air supply knob is securely in place

Answer 145

The trailer brakes have been firmly locked

Question 146

Question: 146. Backing a tractor under a trailer should not commence until the entire air system is ____________? - Decreased to half the maximum pressure - At regular pressure - Between 60 and 80 psi

Answer 146

At regular pressure

Question 147

Question: 147. Failing to conduct the final air brake check before driving without addressing air leaks can result in what? - Decrease in tire pressures - Potential brake failure - Possible increase in fuel consumption

Answer 147

Potential brake failure

Question 148

Question: 148. Semi-trailers made before 1975 that are equipped with air brakes? - Often do not have spring brakes - Are easier to brake because they are heavier - Usually need a glad hand converter

Answer 148

Often do not have spring brakes

Question 149

Question: 149. What is the procedure for supply air to the trailer air tank? - Pull out the trailer air supply valve control - Connect the emergency line glad hand - Engage the trailer brake hand valve control - Push in the trailer air supply valve control

Answer 149

Push in the trailer air supply valve control

Question 150

Question: 150. If the antilock braking system (ABS) fails while towing a trailer, what should be done? - Drive cautiously and at a reduced speed - Pull over and come to a stop - Continue driving normally and have it repaired later

Answer 150

Continue driving normally and have it repaired later

Question 151

Question: 151. Under what circumstance should chocks be employed for parking a trailer lacking spring brakes? - Only when the trailer will be parked on a upward slope - Never - Always

Answer 151

Always

Question 152

Question: 152. When the trailer air supply is pressed and the brakes do not release, what should be done? - Check the connection of the air lines - Inspect the electrical cables - Interchange the air lines

Answer 152

Check the connection of the air lines

Question 153

Question: 153. When the kingpin is securely fastened into the fifth wheel, the front trailer supports are raised, and the trailer is resting on the fifth wheel, it is vital to _______________________? - Ensure that the safety latch is in the unlocked position - Confirm the existence of adequate clearance between the tractor frame and the landing gear to accommodate sharp turns - Verify the presence of sufficient clearance between the upper and lower portions of the fifth wheel

Answer 153

Confirm the existence of adequate clearance between the tractor frame and the landing gear to accommodate sharp turns

Question 154

Question: 154. When coupling a trailer to a tractor, which of the following should you verify? - The trailer is accurately leveled - The tractor is positioned on a lever surface - Neither (A) nor (B) - Both (A) and (B)

Answer 154

The tractor is positioned on a lever surface

Question 155

Question: 155. After uncoupling the trailer and checking the trailer supports, what gear should the tractor be in? - High reverse - Neutral - Low reverse

Answer 155

Neutral

Question 156

Question: 156. A crucial factor impacting the likelihood of rollovers in crashes involving tractor-trailers depends on their load. How does a fully loaded tractor-trailer compare to an empty one? - A fully loaded tractor-trailer is ten time as likely roll over in a crash compared to an empty one - A fully loaded tractor-trailer is twice as likely to roll over in a crash compared to an empty one - A fully loaded tractor-trailer is five times as likely to roll over in a crash compared to a empty one

Answer 156

A fully loaded tractor-trailer is ten time as likely roll over in a crash compared to an empty one

Question 157

Question: 157. To operate a triple combination vehicle, it is mandatory to possess? - A Doubles/Triples (T) endorsement on the CDL - A Class A CDL with Doubles/Triples (T) endorsement - A Class A CDL

Answer 157

A Class A CDL with Doubles/Triples (T) endorsement

Question 158

Question: 158. When coupling a tractor to a trailer, what should be the position of the fifth wheel? - The fifth wheel should be title down towards the rear of the tractor - The fifth wheel should be level with the ground - The fifth wheel should be tilted up towards the rear of the tractor

Answer 158

The fifth wheel should be title down towards the rear of the tractor

Question 159

Question: 159. If it is impossible to execute a right turn without encroaching into another lane, you should? - Make sure to turn wide before initiating the turn - Locate an alternative spot for making the turn - Execute a wide turn as you complete the maneuver

Answer 159

Execute a wide turn as you complete the maneuver

Question 160

Question: 160. When connecting the glad hands, you should press the two seals together with the couplers at what angel to each other? - 90 degrees - 180 degrees - 45 degrees

Answer 160

90 degrees

Question 161

Question: 161. What is the recommended method for making a right turn from a two-way road safely? - In the case of oncoming vehicles, reverse if necessary to avoid crossing into the opposing lane - Execute a wide turn upon completing the maneuver - Initiate the turn with a wide approach

Answer 161

Execute a wide turn upon completing the maneuver

Question 162

Question: 162. You should use chocks when parking a trailer without springs brakes because? - This will prevent air leakage - Some states require chocking of trailer wheels - The brakes will fail if the air supply leaks away

Answer 162

The brakes will fail if the air supply leaks away

Question 163

Question: 163. Which type of trailer necessitates the shortest stopping distance when towed by a tractor? - An empty trailer - A lightly loaded trailer - A fully loaded trailer

Answer 163

A fully loaded trailer

Question 164

Question: 164. The service line is responsible for? - Transmitting air to the cabin of the tractor for cooling purposes - Transferring air to the parking brake, enabling control over the trailer brakes - Supplying air to the relay valve, allowing rapid application of the trailer brakes

Answer 164

Supplying air to the relay valve, allowing rapid application of the trailer brakes

Question 165

Question: 165. Which type of tractor-trailer has the highest probability of experiencing a "crack-the-whip" rollover? - A single tractor-trailer - A tractor pulling three trailers - A tractor pulling two trailers

Answer 165

A tractor pulling three trailers

Question 166

Question: 166. While operating a combination vehicle, if the service line disconnects while the emergency line remains intact, what immediate consequence should you expect? - Nothing is likely to happen until you attempt to apply the brakes - The trailer's air tank will exhaust through the disconnected line - The emergency brakes on the tractor will engage

Answer 166

Nothing is likely to happen until you attempt to apply the brakes

Question 167

Question: 167. When you are uncoupling a loaded trailer, lower the landing gear until it? - Reaches the ground - Make firm contact with the ground and lifts the trailer off the fifth wheel - Make firm contact with the ground and takes some weight off the tractor

Answer 167

Make firm contact with the ground and takes some weight off the tractor

Question 168

Question: 168. Combination vehicles take longer to stop when they are empty than when they are fully loaded, because? - You're unlikely to brake as hard - There is less traction - The center of gravity is lower

Answer 168

There is less traction

Question 169

Question: 169. If you must back a combination vehicle on a curved path, you should try to back? - To the driver's side - In a straight line - To the passenger side

Answer 169

To the driver's side

Question 170

Question: 170. During the process of uncoupling a trailer after shutting off the trailer's air supply and securing the trailers brakes, it is essentials to? - Commence lowering the landing gear on the trailer - Reverse gently to relieve pressure on the fifth wheel locking jaws - Promptly engage the parking brakes on the tractor

Answer 170

Reverse gently to relieve pressure on the fifth wheel locking jaws

Question 171

Question: 171. In the situation where your vehicle becomes stuck on a railroad track, what action should be taken? - Vacate the vehicle and contact 911 or the emergency number indicated - Sound the horn loudly and call 911 or the emergency number indicated - Send a radio request for assistance

Answer 171

Vacate the vehicle and contact 911 or the emergency number indicated

Question 172

Question: 172. While operating a tractor-trailer, if the emergency air line becomes fractured or disconnected, it will result in? - Cessation of air pumping by the compressor - Opening of the trailer supply valve - Activation of the trailer emergency brakes

Answer 172

Activation of the trailer emergency brakes

Question 173

Question:173. Where should the tractor be when you inspect the landing gear after uncoupling the trailer? - With the tractor frame under the trailer - Completely cleared from the trailer - With the fifth wheel directly beneath the kingpin

Answer 173

With the tractor frame under the trailer

Question 174

Question:174. While driving behind another vehicle, under good conditions, you should allow at least one second between your vehicle and the vehicle ahead for each ____________ feet of your vehicle's length? - 20 - 30 - 10

Answer 174

10

Question 175

Question:175. There are two things that driver can do to prevent a rollover. They are: (1) keep the cargo as close to the ground as possible and (2):? - Make sure that the brakes are properly adjusted - Go slow around turns - Keep both hands firmly on the steering wheel

Answer 175

Go slow around turns

Question 176

Question:176. The air brakes leakage rate for a combination vehicle (engine off, brakes off) should not be more than ________ psi per minute? - 3 - 2 - 1/2

Answer 176

3

Question 177

Question:177. If you cannot complete your turn without entering another traffic lane, you should:? - Not make a turn and move to another place where you can make a turn without crossing other lane - Turn wide before you start the turn - Turn wide as you complete the turn

Answer 177

Turn wide as you complete the turn

Question 178

Question:178. The higher the center of gravity of your truck, the:? - Easier to turn around the corner - Easier to turn over - More stable while turning

Answer 178

Easier to turn over

Question 179

Question:179. If the service line comes apart while you are driving a combination vehicle, but the emergency line stays together, what will happen right away? - The emergency trailer brakes will come on - The trailer's tanks will exhaust through the open line - Nothing is likely to happen until you try to apply the brakes

Answer 179

Nothing is likely to happen until you try to apply the brakes

Question 180

Question:180. Glade hands are usually connection which of these? - Service and emergency air lines from the vehicle to the trailer - Electric lines from the tractor to trailer - Kingpin from the trailer to the locking jaws of the fifth wheel

Answer 180

Service and emergency air lines from the vehicle to the trailer

Question 181

Question:181. A driver crosses the air lines when hooking up to an old trailer. What will happen? - If the trailer has no spring brakes you could drive away but you would not have trailer brakes - The brake lights will come on when the brake pedal is pressed - The hand valve will apply the tractor brakes instead of the trailer brakes

Answer 181

If the trailer has no spring brakes you could drive away but you would not have trailer brakes

Question 182

Question:182. The hand valve should be used: - As a parking brake - To test the trailer brakes - Only with a foot brake

Answer 182

To test the trailer brakes

Question 183

Question:183. When driving a set of doubles, it is necessary to close which shut-off valve in the last trailer? - Middle section valve - Front valve - Back valve

Answer 183

Back valve

Question 184

Question:184. You are about to back your tractor under a semitrailer. The trailer is at the right height when the:? - End of the kingpin is even with the top of the fifth wheel - Kingpin is about 1.1/4 inches above the fifth wheel - Trailers will be lifted slightly when the tractor backs under it

Answer 184

Trailer will be lifted slightly when the tractor backs under it

Question 185

Question:185. Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:? - Air compressor to unload instead of pumping air - Trailer supply valve to open - Emergency trailer brakes to come on

Answer 185

Emergency trailer brakes to come on

Question 186

Question:186. If the spring brakes are not released when you push the trailer air supply valve, you should? - Cross the airlines - Check air line connection - Check electrical cable

Answer 186

Check air line connection

Question 187

Question:187. Air brake-equipped trailers made before 1975:? - Usually need glad hand converter - Are not required to have spring brakes - Cannot be legally operated on interstate highways

Answer 187

Are not required to have spring brakes

Question 188

Question:188. There are two things that a driver can do to prevent a rollover: They are :(1) go slow around turns, and (2)? - Keep the cargo as close to the ground as possible - Keep both hands firmly on the steering wheel - Make sure tht the brakes are properly balanced

Answer 188

Keep the cargo as close to the ground as possible

Question 189

Question:189. After connecting the air lines but before backing under the trailer, you should:? - Walk around the rig to be sure that it is clear - Supply air to the trailer system, then pull out the air supply knob - Make sure that the trailer brakes are off

Answer 189

Supply air to the trailer system, then pull out the air supply knob

Question 190

Question:190. Which part of the kingpin should locking jaw close around? - The base - The shank - The head

Answer 190

The shank

Question 191

Question:191. How much space should be allowed between the upper and lower fifth wheel after coupling? - Just enough to sit on - None - 1/4 inch

Answer 191

None

Question 192

Question:192. You have pushed the trailer air supply valve. You should not back a tractor under a trailer until the whole air system is:? - Between 60 and 80 psi - Empty - At normal pressure

Answer 192

At normal pressure

Question 193

Question:193. You are coupling a tractor to the semitrailer; you have connected the airlines. Before backing under the trailer, you should:? - Make sure that the trailer brakes are off - Pull ahead to test the glad hands connection - Supply air to the trailer system, then pull out the air supply knob

Answer 193

Supply air to the trailer system, then pull out the air supply knob

Question 194

Question:194. You are coupling a tractor to a semitrailer and have backed up, but are not under it. What should you hook up before backing under? - The emergency and service air lines - The electrical service cable - Nothing. Back up and lock the fifth wheel

Answer 194

The emergency and service air lines

Question 195

Question:195. Tractor with a ____________ trailer requires the shortest amount of stopping distance? - Empty - Fully loaded - Partly loaded

Answer 195

Fully loaded

Question 196

Question:196. After you have coupled the trailer, you should raise the landing gear by using:? - Intermediate gear - High gear - Low gear

Answer 196

Low gear

Question 197

Question:197. You supply air to the trailer tanks by:? - Pushing in the trailer air supply valve - Connecting the service line glad hands - Pulling out the trailer air supply valve

Answer 197

Pushing in the trailer air supply valve

Question 198

Question:198. There are two things that a driver can do to prevent a rollover. They are: (1) go slow around turns, and (2):? - Keep the fifth wheel free play as small as possible - Keep the cargo as close to the ground as possible - Make sure that the brakes are properly balanced

Answer 198

Keep the cargo as close to the ground as possible

Question 199

Question:199. Why should you be sure that the fifth wheel plate is greased as required? - To prevent steering problems - To reduce heat and noise - To ensure a good electrical connection

Answer 199

To prevent steering problems

Question 200

Question:200. Your emergency air line brakes or gets pulled apart while you a re driving. The loss of pressure will cause the:? - Tractor's air dump into the trailer tank through the service line - Emergency trailer brakes to come on - Air compressor to unload instead of pumping air

Answer 200

Emergency trailer brakes to come on

Question 201

Question:201. When connecting the glad hands, press the two seals with the couplers together at what degree to each other? - 180 degrees - 90 degrees - 45 degrees

Answer 201

90 degrees

Question 202

Question:202. Which of these statements is true? - The brakes and suspension system of combination vehicles work best with a light load - Bobtails tractors can take longer to stop than combination vehicle loaded to maximum gross weight - Light vehicles need more breaking power to stop than heavy ones

Answer 202

Bobtails tractors can take longer to stop than combination vehicle loaded to maximum gross weight

Question 203

Question:203. Why should you lock the tractor's glad hands to each other (or dummy couplers) when you are not towing a trailer? - it will keep dirt or water out of the lines - The connected brake circuit becomes a backup air tanks - If you did not, you could never build system pressure

Answer 203

it will keep dirt or water out of the lines

Question 204

Question:204. When backing a tractor under a trailer, you should:? - Always approach the trailer at a slight angle - Always use the lowest reverse gear - Do it quickly to ensure that the kingpin is locked into the fifth wheel

Answer 204

Always use the lowest reverse gear

Question 205

Question:205. After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position? - Normal position - Up position - Down position

Answer 205

Normal position

Question 206

Question:206. The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:? - The coupling is not right and should be fixed before driving the coupled unit - The parking lock is off, and you may drive away - The trailer will not swivel on the fifth wheel

Answer 206

The coupling is not right and should be fixed before driving the coupled unit

Question 207

Question:207. Off-racking or cheating causes which of these are to follow the wider path while making a turn? - Tractor towing a 45-feet trailer - Tractor with two 27-feet trailers - 53-feet bobtail

Answer 207

Tractor with two 27-feet trailers

Question 208

Question:208. The iron trailer supports are up, and the trailer is resting on the tractor. Make sure: - The safety latch is in unlocked position - There is enough clearance between the upper and lower fifth wheels - There is enough clearance between the tractor frame and the landing gear

Answer 208

There is enough clearance between the tractor frame and the landing gear

Question 209

Question:209. When you are uncoupling a loaded trailer, you should lower the landing gear until it:? - Make firm contact with the ground, turn crank in low gear a few extra turns - Make contact with the ground and leave the trailer off the fifth wheel - Reaches the ground

Answer 209

Make firm contact with the ground, turn crank in low gear a few extra turns

Question 210

Question:210. What will happen if the air lines are crossed when you hook up to an old trailer? - If the trailer has no spring brakes, you could drive away but you would not have trailer brakes - The brake light will come on when the brake pedal is pressed - The hand valve will apply the tractor brakes instead of the trailers brakes

Answer 210

If the trailer has no spring brakes, you could drive away but you would not have trailer brakes

Question 211

Question:211. To stop a trailer skid, you should:? - Counter-steer - Use the trailer hand brakes - Release the brakes

Answer 211

Release the brakes

Question 212

Question:212. The air lines on a combination vehicle are often colored to prevent them from mixing up. The emergency line is __________ and the service line is ________________? - Blue, Red - Black, Yellow - Red, Blue

Answer 212

Red, Blue

Question 213

Question:213. Semi-trailers made before 1975 that are equipped with air brakes? - Usually need a glad hand converter - Have only a service air line - Often do not have spring brakes

Answer 213

Often do not have spring brakes

Question 214

Question:214. The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than _________ psi per minute? - 4 - 2 - 3

Answer 214

4

Question 215

Question:215. Compared to a straight truck or bus, there are ____________ things to inspect in combination vehicles? - Fewer - The same number - More

Answer 215

More

Question 216

Question:216. When checking the trailer emergency brakes, the tractor protection control valve should be placed in what position? - Neutral - Normal - Emergency

Answer 216

Emergency

Question 217

Question:217. In normal driving, some drivers use the hand valve before the brake pedal to prevent a jack-knife. Which of the statements is true? - It is the best way to brake and keep the truck in a straight line - It should not be done - It results in less skidding than using the brake pedal alone

Answer 217

It should not be done

Question 218

Question:218. While checking if the trailer is securely coupled to the tractor, the landing gears should be:? - Fully lowered - Slightly raised - Fully raised

Answer 218

Slightly raised

Question 219

Question:219. After you lock the kingpin into the fifth wheel, you should check the connection by:? - Pulling the tractor ahead gently with the trailer brakes locked - Pulling forward 50 feet, turning right and then left - Backing up with the trailer brakes released

Answer 219

Pulling the tractor ahead gently with the trailer brakes locked

Question 220

Question:220. When should you use the hand valve to park a combination vehicle? - To park at loading docks - Never - To park on a grade

Answer 220

Never

Question 221

Question:221. The safety latch for the fifth wheel locking lever must be __________ for a coupling to be complete? - Over the locking lever - Under the locking lever - Straight up

Answer 221

Over the locking lever

Question 222

Question:222. Before you back under a trailer, make sure that:? - The air supply knob is in - The tractor protection valve is normal - The trailer brakes are locked

Answer 222

The trailer brakes are locked

Question 223

Question:223. The front trailer supports are up, and the trailer is resting on the tractor?Make sure: - There is enough clearance between the top of the tractor tires and nose of the trailer - There is enough clearance between the tractor frame and the landing gear - Both options are correct

Answer 223

Both options are correct

Question 224

Question:224. To unlock the fifth wheel, the locking lever should be placed in the _____________ position? - Closed - Open - Neutral

Answer 224

Open

Question 225

Question:225. The tractor protection valve will close, and the trailer emergency brakes will come on when there is major leak in the _________ brake line? - Emergency - Service - Parking

Answer 225

Emergency

Question 226

Question:226. What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports? - Low reverse - High reverse - Neutral

Answer 226

Neutral

Question 227

Question:227. You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You expect the trailer brakes to come one and:? - The trailer supply valve to stay open - The tractor protection valve to close - The tractor lose air pressure

Answer 227

The tractor protection valve to close

Question 228

Question: 228. Which of the following is NOT part of checking that air is flowing to all trailers? - Pressing the brake pedal several times to lower the air pressure - Pushing in the red "trailer air supply" knob - Opening the emergency line shut-off valve - Going to the rear of the vehicle

Answer 228

Pressing the brake pedal several times to lower the air pressure

Question 229

Question: 229. Which of the following is the definition of "off tracking"? - How the rear wheels follow a different track than the front wheels in a turn - How the rear wheels are more likely to leave the roadside or "track" - What happen when both the front wheels and the rear wheels leave the roadway in a accident - Stopping for too long on brakes and getting "off the track" of your original schedule

Answer 229

How the rear wheels follow a different track than the front wheels in a turn

Question 230

Question: 230. When a vehicle is carrying a load that extends four feet or more beyond the rear of the body at night, there must be ___________ at the extreme end of the load? - Two red lights - A red flag - Two red flag

Answer 230

Two red lights

Question 231

Question: 231. Since what year have trucks been required to have antilock brake system (ABS)? - 1998 - 2000 - 2003 - 1990

Answer 231

1998

Question 232

Question: 232. If yo do not do the final air brake check for air leaks and fix them before driving? - Your fuel usage will increase - Tire pressure will drop - You could lose your brakes while driving

Answer 232

You could lose your brakes while driving

Question 233

Question: 233. Which of the following offtracks the most? - None (i.e., they all offtacke equally) - The tractor - The trailer coupled to the tractor - The rearmost trailer

Answer 233

The rearmost trailer

Question 234

Question: 234. What is the emergency air line for? - To engage the front brakes of the tractor in case of an emergency - To engage the trailer brakes in case of air pressure loss - To have extra air pressure in case you need it

Answer 234

To engage the trailer brakes in case of air pressure loss

Question 235

Question: 235. To drive, how high do you need to rise the landing gear? - All the way up - Part of the way up - Only slightly off the ground so that it will be easier to use later - Exactly 6 feet off the ground

Answer 235

All the way up

Question 236

Question: 236. Where would you find the shut-off valves? - In the front of the tractor - In the rear of the tractor - In the rear of the trailer - In the front of a trailer

Answer 236

In the rear of the trailer

Question 237

Question: 237. Which of the follow is NOT part of inspecting the sliding fifth wheel during a walk-around inspection? - Making sure the crank handle is in place and safely secured - Checking that the sliding fifth wheel is properly greased - If the sliding fifth wheel is air powered, checking that there are no air leaks - Making sure that the sliding fifth wheel is not too far forward

Answer 237

Making sure the crank handle is in place and safely secured

Question 238

Question: 238. What is the best way to test the trailer service brakes? - Try putting the hand brake on when you are on a deserted road - Accelerate to the maximum speed possible in a parking lot, then apply the trailer brakes - Pull forward very slowly, then apply the trailer brakes with your hand control - Pull forward very quickly, then apply the trailer brakes with your hand control

Answer 238

Pull forward very slowly, then apply the trailer brakes with your hand control

Question 239

Question:239. If your test of the tractor protection valve is successful? - A low air pressure warning signal will come on - The tractor protection valve control (trailer air supply control) will pop out or go from "normal" to "emergency". - The parking brake valve will pop out

Answer 239

The tractor protection valve control (trailer air supply control) will pop out or go from "normal" to "emergency".

Question 240

Question:240. To uncouple a loaded trailer, after the landing gear has made firm contact with the ground, you should? - Turn the crank a few more times to lift some weight off the tractor - Turn the crank a few more times until the trailer is lifted off the fifth wheel - Secure the crank handle safely

Answer 240

Turn the crank a few more times to lift some weight off the tractor

Question 241

Question: 241. The tractor protection valve will close and the trailers ______________ brakes will come on?- Emergency- Parking- Service

Answer 241

Emergency

Question 242

Question: 242. What does the trailer air supply control do? - By pushing it in, you supply the trailer with air - By pulling it out, you supply the trailer with air - By pushing it in, you supply the tires with air - By pulling it out, you remove air from overinflated tires

Answer 242

By pushing it in, you supply the trailer with air

Question 243

Question: 243. Which of the following types of vehicles are most likely to get stuck at raised railroad crossing? - Moving vans - Car carriers - Single-axle tractors pulling a long trailer with its landing gear set for a tandem-axle tractor - All of the above

Answer 243

All of the above

Question 244

Question: 244. When you're coupling a tractor-semitrailer, which of the following is NOT a part of inspecting the fifth wheel?- Checking the area around the vehicle - Checking for missing or damaged parts - Checking that the fifth wheel plate is properly greased - Checking that the fifth wheel is in the proper position for coupling

Answer 244

Checking the area around the vehicle

Question 245

Question: 245. The kingpin is locked into the fifth wheel, the front trailer supports are up, and the trailer is resting on the fifth wheel. Make sure that? - There is enough clearance between the upper and lower fifth wheel - There is enough clearance between the tractor frame and the landing gear to accommodate sharp turns - The safety latch is in the unlocked position

Answer 245

There is enough clearance between the tractor frame and the landing gear to accommodate sharp turns

Question 246

Question: 246. You wish to turn right from one two-lane, two-way street onto another. Your truck is too long to turn without swinging wide. You should turn as shown in path? - A - B - C

Answer 246

B

Question 247

Question: 247. Which type of truck-trailer combination has the greatest chance of a "crack-the-whip" rollover? - A single tractor trailer - A tractor pulling three trailers - A tractor pulling two trailers

Answer 247

A tractor pulling three trailers

Question 248

Question: 248. For coupling to be completed, the safety latch for the fifth wheel locking leaver must be? - Straight up - Over the locking lever - Through the locking lever

Answer 248

Over the locking lever

Question 249

Question: 249. Which of the following is NOT part of checking that air is flowing to all trailers? - Pressing the pedal several times to lower the air pressure - Pushing in the red "trailer air supply" knob - Opening the emergency line shut-off valve

Answer 249

Pressing the pedal several times to lower the air pressure

Question 250

Question: 250. Which of the following is NOT part of testing the trailer's service pressure? - Checking for normal air pressure - Putting the trailer air supply control in the "emergency" position - Releasing the parking brakes - Driving your vehicle forward very slowly

Answer 250

Putting the trailer air supply control in the "emergency" position

Question 251

Question: 251. The service line? - Carries air to the parking brake to control the trailer brakes - Carried air to a relay valve that allows the trailer brakes to be applied quickly - Carries air to the cab of the rig to cool it

Answer 251

Carried air to a relay valve that allows the trailer brakes to be applied quickly

Question 252

Question: 252. When you turn suddenly while pulling doubles, which trailers is most likely to turn over? - The rear trailer is twice as likely to turn over as the tractor - The front trailers is twice as likely as likely to turn over as the tractor - Each trailer is just as likely to turn over as the tractor

Answer 252

The rear trailer is twice as likely to turn over as the tractor

Question 253

Question: 253. When you drive a set of doubles, which shout-off valve must be closed in the last trailer? - Front - Rear - Middle section

Answer 253

Rear

Question 254

Question: 254. Which of the following could happen if you try to couple when the trailer is too high? - It might not couple correctly - You could damage the trailer nose - The tractor might strike and damage the trailer - The tractor could roll away

Answer 254

It might not couple correctly

Question 255

Question: 255. Which of the following is NOT part of testing the tractor protection valve? - Shutting off the engine - Pressing the brake pedal several times to release air - Charging the trailer's air brake system - Pulling forward slowly, then applying the trailer brakes

Answer 255

Pressing the brake pedal several times to release air

Question 256

Question: 256. You should not use the trailer hand valve to straighten out jackknifing trailer, because? - The brake handle is too hard to reach - The brakes on the trailer wheels caused the skid in the first place - The brakes on the trailer wheels will not respond to the hand valve

Answer 256

The brakes on the trailer wheels caused the skid in the first place

Question 257

Question: 257. You should not use the trailer hand valve while driving because? - It wont work as well as the foot brake - You should use the parking brake - Of the danger of making the trailer skid

Answer 257

Of the danger of making the trailer skid

Question 258

Question:258. You are coupling a semi-trailer to your tractor but have not yet backed under it. The trailer is at the right height if? - It will be raised slightly when the tractor is backed under it - The kingpin is about 1 1/4 inches above the fifth wheel - The end of the kingpin is even with the top of the fifth wheel

Answer 258

It will be raised slightly when the tractor is backed under it

Question 259

Question:259. To back up a trailer, what should you do? - Use your mirror on both sides - Check your path carefully by walking around your vehicle - Do all of the above

Answer 259

Do all of the above

Question 260

Question:260. Which of the following is NOT part of inspecting the coupling? - Checking that there is no space between the upper and lower fifth wheel - Driving a few feet to test that it is connected correctly - Checking that the fifth wheel jaws have closed on the correct part of the kingpin - Checking that the locking lever is in the correct ("lock") position

Answer 260

Driving a few feet to test that it is connected correctly

Question 261

Question:261. You should use chocks when parking a trailer without spring brakes because? - You don't want the trailer rolling down a hill - The brakes will fail if the air supply leaks away - Some states require chocking of trailer wheels

Answer 261

The brakes will fail if the air supply leaks away

Question 262

Question:262. To straighten out a jackknifing trailer, should you apply the trailer hand brake? - Yes, because the trailer hand brake will help you get out of the skid - No, because the brakes on the trailer wheels caused the skid to being with - Yes, because the trailer hand brake may not stop the skid, but it will reduce the risk of a rollover - It depends on how fast you were going to begin with. Apply the hand brake if you were speeding

Answer 262

No, because the brakes on the trailer wheels caused the skid to being with

Question 263

Question:263. Which of the following is NOT a way to tell if your trailer is equipped with an antilock braking system (ABS)? - Check if it was built after March 1,1998 - Check if it has a yellow ABS malfunction lamp - Check if the letters "ABS" are painted on the left side of the trailer

Answer 263

Check if the letters "ABS" are painted on the left side of the trailer