×

Quiz Session - Attempts With Random Questions

ASE T Series Exam Questions

Page 5 of 20

81.

Cylinder head warpage is measured using a:

  • Feeler gauge 

  • Micrometer 

  • Dial indicator 

  • Plastigauge

Correct answer: Feeler gauge

Cylinder head warpage is measured using a straight edge and feeler gauge. The measurements should be taken at each end of the head, between each cylinder, between the center line of the valves, and at the outer edge of the fire deck. Compare the measurements to the manufacturer's specifications to determine if the head needs to be resurfaced.

82.

What is the typical pressure on the high side of a high-pressure common rail system?

  • 5,000 to 30,000 PSI

  • 500 to 1000 PSI

  • 1000 to 2000 PSI

  • 25,000 to 35,000 PSI

Correct answer: 5,000 to 30,000 PSI

In high pressure common rail system, the high pressure fuel pump pressurizes fuel in the range of 5,000 to 30,000 PSI.

83.

Integral-type steering gears are being discussed. Technician A says both the input and output shafts should be removed to measure steering gear preload torque. Technician B says the steering gear should be centered in preparation for lash adjustment. Who is correct?

  • Both A and B

  • Technician A 

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. Both the input and output shafts should be removed to measure steering gear preload torque. This is done to prevent binding in the steering from affecting worm preload and sector lash adjustment. In addition, the steering gear should be centered in preparation for lash adjustment.

84.

Technician A says the EGR valve is turned off during passive regeneration. Technician B says the vehicle may be either parked or moving during active regeneration. Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Technician B is correct. During active regeneration, the ECM turns off the EGR valve and injects fuel into the exhaust stream to raise the temperature and clean the soot. This can happen while either driving or parked. During passive regeneration, regeneration can occur without fuel being injected and without the EGR valve being turned off. 

85.

Frost forming on the receiver-drier indicates what?

  • The receiver-drier is internally restricted  

  • The receiver-drier is stuck open

  • The A/C system has moisture contamination 

  • The desiccant bag has broken 

Correct answer: The receiver-drier is internally restricted  

If the receiver-drier inlet and outlet temperatures are significantly different, or there is frost forming on the receiver-drier, the unit is internally restricted.

86.

Technician A says a defective spring brake valve can lead to the parking brake applying when a leak occurs. Technician B says a multi-function valve limits air pressure used to keep the trailer parking brakes on. 

Who is correct?

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Only technician A is correct. When the spring brake valve is defective, the parking brake may apply when a leak occurs. 

Technician B is incorrect. The multi-function valve (spring brake valve) limits the air pressure used to keep trailer brakes off, not on. 

87.

All of the following are true regarding input shafts except:

  • They fit into the throw-out bearing

  • They can be damaged from bell housing misalignment 

  • They carry the entire torque load of the vehicle

  • They should be checked for wear of both the splines and gear portion

Correct answer: They fit into the throw-out bearing

On vehicles with a manual transmission, the input shaft fits into the pilot bearing, not the throw-out bearing. All of the other answers are true.

88.

Voltage drop across the negative battery cable should be less than:

  • 0.3 volts 

  • 0.5 volts

  • 0.2 volts 

  • 0.1 volts 

Correct answer: 0.3 volts

The condition of the battery cables can be determined by performing a voltage drop test with a digital multimeter. The negative battery cable should have a voltage drop of less than 0.3 volts.

89.

The A/C refrigerant pressure switch is designed to open when pressure exceeds:

  • 300 psi

  • 150 psi

  • 400 psi

  • 500 psi

Correct answer: 300 psi

Trucks with A/C systems use a refrigerant pressure switch as an input for fan control. When pressure in the A/C system exceeds 300 psi, the switch opens. When pressure returns to less than 210 psi, the switch closes. 

90.

Technician A says evaporator temperature ranges should be between 32 and 40 degrees Fahrenheit. Technician B says that air passing over the evaporator goes up in temperature. Who is correct?

  • Technician A

  • A and B

  • Technician B

  • Neither A nor B

Correct answer: Technician A

Technician A is correct. The temperature range of the evaporator should be between 32 and 40 degrees Fahrenheit. If it's too cold, ice could build up on the fins and block airflow, while temperatures that are too high lead to trouble cooling.

Technician B is incorrect. The air passing over the evaporator is going to lose heat and get cooler. 

91.

A faulty PCV system is least likely to result in which of the following?

  • A misfire under load

  • Increased oil consumption 

  • Dirty oil

  • Stalling

Correct answer: A misfire under load

A misfire under load typically indicates a problem with the ignition system. Engine performance problems that are related to the PCV system typically happen at low engine speeds. Common symptoms of a fault in the PCV system include increased oil consumption, dirty oil, excessive blow-by, rough idle and stalling.

92.

Most transmissions regulate pressure at approximately:

  • 60 psi

  • 30 psi

  • 45 psi

  • 80 psi

Correct answer: 60 psi

Transmission gear selection in the auxiliary section is air-controlled. Most transmissions regulate air pressure at approximately 60 psi. 

93.

Technician A says jump-out generally occurs when pulling with full power or decelerating with the load pushing. Technician B says slip-out generally occurs when a fully engaged gear and sliding clutch are forced out of engagement. Who is correct?

  • Neither A nor B

  • Technician A

  • Technician B

  • Both A and B

Correct answer: Neither A nor B

Both technicians are wrong. The teeth must be parallel when a sliding clutch is moved to engage a main shaft gear. Tapered or worn clutching teeth cause the gear to slip out of engagement. Slip-out generally occurs when pulling with full power or decelerating with the load pushing. Jump-out generally occurs when a fully engaged gear and sliding clutch are forced out of engagement. 

94.

When checking the coolant hoses for structural integrity, they should be squeezed between your fingers halfway between connections and no further than how many inches from each end?

  • 2 inches

  • 1 inch

  • 3 inches

  • 4 inches

Correct answer: 2 inches

Even if coolant hoses look reliable, there could be internal damage. For this reason, the hoses should be squeezed between your fingers to check their integrity. 

It's important to check the midway point of the hose. You should also check each end, no further than two inches from the connectors, so you can compare the integrity between the different points. 

95.

An engine noise is heard under acceleration. Which of the following is the least likely cause?

  • Worn camshaft bearings

  • Worn pistons

  • Worn cylinders 

  • Worn main bearings 

Correct answer: Worn camshaft bearings 

Worn pistons and/or cylinders typically make a rapping noise during acceleration, whereas worn main bearing make a deep-sounding metallic knocking. Worn camshaft bearings, however, usually do not cause a noise unless severely worn.

96.

Technician A says that the power take-off (PTO) is only operated through manual or electronic controls. Technician B says that the PTO opening can be found on either or both sides of the transmission.

Who is correct? 

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Technician A is incorrect. PTOs are powered manually, by electronic control, or by air. 

Technician B is correct. Many trucks have an opening for the PTO unit installation on either or both sides of the transmission. 

97.

Dog tracking indicates which alignment angle is out of specification?

  • Thrustline 

  • Ackerman

  • Caster 

  • Camber 

Correct answer: Thrustline

When a vehicle's rear wheels track directly behind the front wheels, the vehicle has a proper thrustline. On the other hand, dog tracking indicates thrustline that is out of adjustment, potentially due to worn rear steering or suspension parts. 

98.

Which of the following is the MOST LIKELY reason for bump steer?

  • Bad rack-and-pinion system mounting bushings

  • Bad tie-rod end

  • Bad kingpin bushings

  • Bad shocks or struts

Correct answer: Bad rack-and-pinion system mounting bushings

Bump steer refers to the steering changes that occur when a truck goes over dips or bumps in the road. Typically, this problem is caused by bad rack-and-pinion system mounting bushings. 

99.

The primary function of the EGR system is to reduce what?

  • NOx

  • HC

  • CO

  • CO2

Correct answer: NOx

The exhaust gas recirculation (EGR) system is designed to reduce oxides of nitrogen by circulating a small amount of exhaust gas back into the engine to lower the combustion temperature. 

100.

How do you correct crankshaft end play?

  • Replace the thrust bearings 

  • Install shims

  • Replace the crankshaft 

  • Replace the main bearings 

Correct answer: Replace the thrust bearings

Crankshaft end play is checked using a dial indicator. If end play is excessive, thrust bearings can be installed to bring it within specification.

×