How much space should be between the upper and lower fifth wheel after coupling?
a. About 1/4 inch
b. None
c. Just enough to see light through it
b. None
When should you use chocks to park a trailer not equipped with spring brakes?
a. Always
b. Never
c. Only when it will be parked on an incline
a. Always
Which part of the kingpin should the locking jaws close around?
a. The shank
b. The head
c. The base
a. The shank
You are coupling a tractor to a semitrailer. You have backed up but are not under it. What should you hook up before backing under the semitrailer?
a. Nothing. Back up and lock the fifth wheel
b. The emergency and service air lines
c. The electrical service cable
b. The emergency and service air lines
If you cannot make a turn without entering another traffic lane, you should:
a. Not make that turn
b. Turn wide before you start your turn
c. Turn wide as you complete the turn
c. Turn wide as you complete the turn
After you lock the kingpin into the fifth wheel, you should check the connection by pulling:
a. Forward 50 feet, turning right, and left
b. The tractor ahead gently with the trailer brakes locked
c. The tractor ahead sharply to release the trailer brakes
b. The tractor ahead gently with the trailer brakes locked
You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should:
a. Immediately put on you tractor parking brakes
b. Back up gently to ease pressure on the fifth wheel locking jaws
c. Begin to lower the trailer landing gear
b. Back up gently to ease pressure on the fifth wheel locking jaws
For a coupling to be completed, the safety catch for the fifth wheel locking lever must be:
a. Straight up
b. Through the locking lever
c. Over the locking lever
c. Over the locking lever
Air and electric lines from the tractor to the trailer should be:
a. Secured, but with enough slack for turns
b. Resting on the frame of the tractor
c. Pulled tight, with every little slack
a. Secured, but with enough slack for turns
Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every _____ feet of your vehicle’s length.
a. 20
b. 10
c. 30
b. 10
To unlock the fifth wheel, pull the release handle to the ____ position.
a. Closed
b. Open
c. Neutral
b. Open
In general, the higher your truck’s “center of gravity” the:
a. More stable it is when turning
b. Easier it is to turn over
c. Easier it is to turn around corners
b. Easier it is to turn over
When coupling, the proper position of the fifth wheel is:
a. Level with the ground
b. Tilted up towards the end of the tractor
c. Tilted down towards the end of the tractor
c. Tilted down towards the end of the tractor
After you connect the air lines, but before you back under the trailer, you should:
a. Walk around the rig to be sure it is clear
b. Make sure the trailer brakes are off
c. Supply air to the trailer system, then pull out the air supply knob
c. Supply air to the trailer system, then pull out the air supply knob
A tractor with a(n) _____ trailer requires the shortest stopping distance
a. Empty
b. Lightly loaded
c. Fully loaded
c. Fully loaded
Which statement is true
a. The brake and suspension systems of combination vehicles work best with a light load
b. “Bobtail” tractors can take longer to stop than a combination vehicle loaded to maximum gross weight
c. Light vehicles need more braking power to stop than heavy ones
b. “Bobtail” tractors can take longer to stop than a combination vehicle loaded to maximum gross weight
To stop a trailer skid you should:
a. Counter steer
b. Use the trailer hand brake
c. Release the brakes
c. Release the brakes
You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:
a. At normal pressure
b. Between 60 and 80 psi
c. Empty
a. At normal pressure
Why should you be sure that the fifth wheel plate is grease as required?
a. To reduce heat and noise
b. To ensure good electrical connections
c. To prevent steering problems
c. To prevent steering problems
Before you back under a truck trailer, make sure the:
a. Trailer brakes are locked
b. Air brakes are off
c. Air supply knob is in
a. Trailer brakes are locked
