CTE > Untitled Deck > Flashcards

Untitled Deck Flashcards

(62 cards)

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1
Q

What should the technician do first if the tachometer does not sweep during a gauge sweep test?

A
  • Test the Tachometer
  • Replace the Tachometer
  • Replace the instrument cluster unit
  • Test the body control module

Testing the tachometer is essential before replacing components.

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2
Q

On a truck equipped with air brakes, how should the ABS light operate when the vehicle is first started?

A

Come On momentarily, then go OFF

This indicates that the system is functioning correctly without faults.

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3
Q

What does the indicator light on a diesel powered truck represent?

A
  • DPF Regen
  • MIL
  • Hot exhaust
  • Check engine

Each light indicates different operational statuses of the vehicle.

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4
Q

What is the purpose of evacuating an A/C system?

A
  • To check for leaks
  • To remove air / moisture
  • Clean the Oil
  • To seal the system

Evacuating ensures the system is free of contaminants.

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5
Q

If the lower shoe is worn more than the upper shoe during an air brake inspection, what could be the cause?

A
  • Brakes out of adjustment
  • Incorrect brake chamber
  • A stuck-open ABS actuator
  • Broken return springs

These issues can lead to uneven wear on brake components.

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6
Q

Drive train manufacturers are using lower viscosity fluid to:

A
  • Reduce service life of components
  • Increase wear on components
  • Increase overall fuel economy
  • Increase friction

Lower viscosity fluids can enhance fuel efficiency.

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7
Q

On a truck with hydraulic brakes, if the brake pedal slowly sinks to the floor, what could be the cause?

A
  • An open hydraulic pump relay
  • A leaking power steering reservoir filter seal
  • An open brake pedal switch
  • A leaking master cylinder cup seal

These issues indicate potential hydraulic system failures.

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8
Q

When replacing an alternator, what should the technician first disconnect?

A

Negative battery cable from the battery

Disconnecting the negative cable prevents electrical shorts.

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9
Q

Who is correct regarding marking the driveshaft and differential flanges before removal?

A

C. Both A & B

Proper marking ensures correct reassembly and alignment.

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10
Q

Anything that opposes the flow of electrons in an electrical circuit is called:

A

Resistance

Resistance is a fundamental concept in electrical circuits.

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11
Q

Which terminal on the Data link connector is High Speed +?

A

Pin C – J1939 Data Link (+)

This terminal is crucial for communication in heavy-duty vehicles.

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12
Q

In testing a power steering system, Technician A says the flow rate should be checked. Technician B says the test should be performed with the fluid cold. Who is right?

A

A only

Flow rate is a critical parameter for power steering performance.

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13
Q

Air escaping from the service brake chamber with the brake pedal applied could be caused by a leak at the:

A
  • Spring-brake side of the chamber
  • Push rod dust boot
  • Diaphragm of the chamber
  • Slack adjuster

Identifying the source of the air leak is essential for brake system integrity.

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14
Q

The fan in the HVAC blower motor circuit does not run on low or low/medium but works on high. This could be caused by:

A
  • An open blower motor fuse
  • An open blower motor resistor block
  • An open blower motor ground
  • A shorted blower motor

The resistor block is often the culprit for speed control issues.

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15
Q

If the engine oil level is excessively high and contaminated with diesel fuel, who is right about the possible causes?

A

C. Both A and B

Both a leaking fuel injector and a leaking head gasket can introduce fuel into the oil.

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16
Q

Which may be used to protect electrical wiring as it passes through a hole in the bulkhead?

A

Rubber grommet

Grommets prevent abrasion and damage to wiring.

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17
Q

An engine has experienced repeated drive belt failures. Any of these could be the cause EXCEPT:

A

Pulley composition

The other options directly affect belt performance.

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18
Q

What happens to a wire’s current load capability as the wire diameter increases?

A

Increases

Larger diameter wires can carry more current safely.

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19
Q

A truck’s cab air ride suspension bounces more than it should. This could be caused by:

A
  • A leaking leveling valve
  • Failed air springs
  • Low air pressure
  • Worn shock absorbers

Each of these factors can affect ride quality.

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20
Q

On a truck equipped with ABS air brakes, if the steer axle brakes are releasing at different speeds, this could be caused by:

A
  • Failed steer axle modulating valve
  • A failed steer axle relay valve
  • A failed steer axle tractor protection valve
  • A failed double check valve

Proper function of these valves is critical for brake performance.

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21
Q

The tool shown is used to:

A
  • Cage the service brake
  • Cage the spring brake
  • Adjust the service brake
  • Adjust the spring brake

Proper use of tools ensures safe brake maintenance.

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22
Q

With 60 psi of air supplied to a type-30 service brake chamber, what is the output force to the slack adjuster?

A

600 lbs

Understanding brake chamber output is essential for brake system design.

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23
Q

If the in-dash engine oil pressure gauge is reading lower than normal, which should be performed first?

A
  • Check the oil pressure with manual gauge
  • Replace the oil pressure gauge
  • Replace the oil pressure sending unit
  • Check the engine oil level

Manual checks are crucial for accurate diagnosis.

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24
Q

When inspecting a clutch for proper adjustment, which should the technician check?

A
  • Clutch pedal free play
  • Flywheel out-of-round
  • Clutch brake squeeze
  • Crankshaft endplay

Proper clutch adjustment is vital for vehicle performance.

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25
During an inspection of the charging circuit, if the alternator output is lower than specification, which could be the cause?
* Low resistance in the negative cable * Low resistance in the positive cable * Excessive alternator drive belt tension * A failed voltage regulator ## Footnote Each of these factors can impact alternator performance.
26
What component in the clutch system slows or stops the rotation of the input shaft during engagement of reverse or 1st gear?
The clutch brake ## Footnote The clutch brake is essential for smooth gear engagement.
27
The low pressure warning light on an air brake vehicle should come on when the pressure drops to:
30-40 psi ## Footnote This is a critical safety feature in air brake systems.
28
After changing the oil and filter on a HEUI fuel injected engine, if the engine is hard to start and runs rough, which could be the cause?
* The oil filler cap was not properly installed * The drain plug was not properly tightened * The wrong viscosity oil was used * The wrong oil was used ## Footnote Proper oil maintenance is crucial for engine performance.
29
Mismatched pressure in a rear dual tire set can cause:
* Valve caps to loosen * Driver abuse * Rim damage * Abnormal wear ## Footnote Maintaining proper tire pressure is essential for safety and performance.
30
The tire wear pattern observed during a preventive maintenance inspection could be caused by:
* Ply separation * Belt separation * Improper alignment * Improper inflation ## Footnote Identifying the cause of tire wear is critical for vehicle safety.
31
A driver complains of a vibration felt at all vehicle speeds. Technician A says this could be caused by out-of-round tires. Technician B says this could be caused by a loose driveshaft carrier bearing. Who is right?
C. Both A and B ## Footnote Both conditions can lead to vibrations in the vehicle.
32
When servicing a truck with an illuminated check engine light, what should the technician do first?
Retrieve active codes ## Footnote Active codes provide immediate insight into the issue.
33
Which type of A/C refrigerant is most commonly used in current on-highway trucks?
R134a ## Footnote R134a is widely used due to its effectiveness and environmental regulations.
34
From where should an oil sample be obtained during a full service?
From midstream of the oil drain ## Footnote This method ensures a representative sample of the engine oil.
35
The purpose of the **over-crank protection (OCP)** on a starter is to:
* Prevent the starter from cranking for more than 30 seconds * Prevent the starter motor from overheating * Prevent the driver from cranking the engine too fast * Slow the starter motor speed down for more torque ## Footnote OCP is crucial for starter longevity.
36
The purpose of **coolant system bleeding** is to:
* Remove excess coolant * Equalize system pressure * Remove air pockets * Reduce system scaling ## Footnote Bleeding ensures efficient cooling system operation.
37
Which tool should be used to measure **disc brake rotor thickness**?
Inside micrometer ## Footnote Accurate measurement is essential for brake safety.
38
Which A/C component changes refrigerant from a gas into a liquid?
The Condenser ## Footnote The condenser plays a vital role in the refrigeration cycle.
39
If the steering wheel shakes at 50 to 55 mph, this could be caused by:
* A bent inner tie rod * Low steer tire pressure * An improperly balanced tire * Uniformly worn tire tread ## Footnote Identifying the cause of steering vibrations is critical for safety.
40
Technician A says that **cetane** is a measure of diesel fuel combustibility. Technician B says that higher cetane rating fuels are required during warmer weather. Who is right?
A only ## Footnote Cetane ratings affect combustion efficiency but are not temperature dependent.
41
How often should a **clunk test** be performed while inspecting a truck with air brakes?
Every inspection ## Footnote Regular testing ensures brake system integrity.
42
The DOT allows tint on the windshield of a truck as long as it is:
Not extending more than 4” down from the top of the windshield ## Footnote Compliance with regulations is crucial for safety.
43
Which could cause a truck to wander left and right?
* Excessive toe-out * Excessive Ackerman angle * Excessive positive camber * Excessive negative camber ## Footnote Proper alignment is essential for vehicle handling.
44
If the transmission has been overfilled, what will happen if the fluid is not adjusted to the normal level?
The transmission fluid will aerate ## Footnote Aeration can lead to poor transmission performance.
45
The purpose of the **engine brake** is to:
* Shut down the engine in the event of an engine run-away situation * Limit the maximum engine rpm during normal highway driving * Help slow down the vehicle to reduce brake lining wear * Provide manual transmission shift synchronization assistance ## Footnote Engine brakes are essential for vehicle control.
46
Which components may be found on **air-operated disc brakes**?
* Slack adjuster * Drum * Shoes * S-cam ## Footnote Understanding brake components is critical for maintenance.
47
If oily fluid is leaking on the inside of the tire during a semi-tractor brake inspection, which could be the cause?
* A leaking wheel cylinder * A leaking axle shaft gasket * A leaking hub cap gasket * A leaking wheel seal ## Footnote Identifying leaks is crucial for brake safety.
48
The drivetrain component shown is:
* An idler bearing * A support sleeve * A jounce bumper * A carrier bearing ## Footnote Understanding drivetrain components is essential for repairs.
49
Both front tires show wear on the outside edges. This could be caused by:
* Too much toe-in * Worn shocks * Air pressure being set too low * Air pressure being set too high ## Footnote Tire wear patterns provide insights into alignment and suspension issues.
50
Which electrical device acts as a one-way check valve for electricity?
Diode ## Footnote Diodes are essential for controlling current flow in circuits.
51
During the inspection of a two-way (double) check valve on a truck equipped with air brakes, what should occur?
* The primary and secondary tanks should be drained at the same time * The primary tank should hold pressure when the secondary tank is drained * The secondary tank should double in pressure when the primary tank is drained * Both the primary and secondary tanks should double in pressure when testing the valve ## Footnote Proper valve function is critical for brake system reliability.
52
When locating a small coolant leak, the technician should start by:
* Draining and flushing the cooling system * Road testing the truck * Pressure testing the system above operating pressure * Filling the system to the proper level ## Footnote Effective leak detection is crucial for cooling system maintenance.
53
Technician A says that the **cabin air filter** should be inspected every vehicle service and replaced at least once a year. Technician B says that the cabin air filter may be located behind the glove box. Who is right?
C. Both A and B ## Footnote Regular inspection and replacement of the cabin air filter is important for air quality.
54
The purpose of the engine cooling system **thermostat** is to:
* Increase coolant flow * Reduce air flow across the radiator * Regulate engine operating temperature * Control the air conditioning compressor clutch ## Footnote The thermostat is crucial for maintaining optimal engine temperature.
55
When resistance in an electrical lighting circuit goes up, if the voltage stays the same, the:
Amperage will go down ## Footnote This relationship is defined by Ohm's Law.
56
Technician A says that synthetic lube can be used to top off any manual transmission as long as it is the same viscosity. Technician B says that service history and TSB’s should be checked. Who is right?
B only ## Footnote Checking service history ensures compatibility and performance.
57
What happens to the **amperage** when resistance in an electrical lighting circuit goes up, if the voltage stays the same?
Amperage will go down ## Footnote According to Ohm's Law, if resistance increases while voltage remains constant, current (amperage) decreases.
58
Who is correct regarding the use of **synthetic lube** in a manual transmission service?
B only ## Footnote Technician B is correct in stating that service history and TSB’s should be checked before starting the service.
59
When a driver hears a **squeal noise** from the engine compartment, who is correct about the inspection?
C. Both A and B ## Footnote Technician A suggests inspecting the A/C compressor pulley for alignment, while Technician B recommends checking the A/C clutch coil continuity.
60
What could cause the **left headlight** on a truck to be dim on both high and low beam settings?
* A broken power wire * A poor ground * An open fuse * A failed dimmer switch ## Footnote Any of these issues could lead to insufficient power reaching the headlight.
61
What is the **maximum leakage rate** for a full governed straight truck with air brakes at a minimum application pressure of 90 psi?
3 psi per minute ## Footnote This is the standard maximum leakage rate for air brake systems.
62
At what pressure will the **brake warning light** illuminate and the buzzer sound on a truck equipped with air brakes?
60 psi ## Footnote This pressure indicates that the air pressure is critically low, prompting a warning to the driver.
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