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Quiz Session - Attempts With Random Questions

ASE T Series Exam Questions

Page 9 of 20

161.

A cylinder balance test is being performed. Cylinder #3 shows little change in engine RPM when the analyzer causes it to cut out. Technician A says low compression on that cylinder could be the cause. Technician B says a bad fuel injector could be the cause. 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. If a cylinder is functioning normally, a noticeable decrease in engine RPM will occur when that cylinder is cut out by an analyzer. Anything that causes a misfire could be the cause. This includes compression problems, as well as ignition and fuel delivery issues. 

162.

Technician A says most purge solenoids are normally open. Technician B says most vent solenoids are normally closed. 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. Most purge solenoids are normally closed in order to block engine vacuum to the canister until opened. On the other hand, most vent solenoids are normally open to allow air to pass through the solenoid until closed. 

163.

Low oil pressure can be caused by all of the following except:

  • Worn rings

  • Diluted oil

  • A restricted pump pickup screen

  • Excessive bearing clearance 

Correct answer: Worn rings

Worn rings may result in oil consumption, but they will not cause low oil pressure. Low oil pressure is typically caused by diluted oil, excessive bearing clearance, a restricted oil pickup screen or internal oil leaks.

164.

The skirt of a piston is heavily scored diagonally. Which of the following is the most likely cause? 

  •  A bent connecting rod

  • A faulty harmonic balancer 

  • Worn piston rings

  • A spun rod bearing

Correct answer: A bent connecting rod

The wear pattern found on a piston skirt should be slight and centered on the skirt in a vertical line. A bent or twisted connecting rod will result in scoring that is diagonal, not vertical. 

165.

Wheel cylinders are being discussed. Technician A says brake fluid accumulated behind the dust cover indicates scored/pitted wheel cylinder bores . Technician B says wheel cylinders are usually cast from aluminum. Who is correct?

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Only technician A is correct. Scored/pitted wheel cylinder bores allow fluid to leak past the cylinder seals and into the rubber dust boot. Technician B is wrong because most wheel cylinders are made of cast iron.

166.

The factory-fill lubricant of a new or reconditioned axle should be flushed after how many miles?

  • 1,000

  • 500

  • 5,000

  • 7,500

Correct answer: 1,000

The factory-fill lubricant of a new or reconditioned axle should be flushed after 1,000 miles to remove fine particles generated during the break-in period. 

167.

Which of the following is most likely to result in brakes that grab?

  • Contaminated linings

  • Warped rotors 

  • Worn brake pads

  • A leaking caliper

Correct answer: Contaminated linings

Brakes that grab are often caused by contaminated linings. Warped rotors would result in brake pulsation, worn brake pads would result in brake noise and possibly poor braking performance, and a leaking caliper would result in a soft brake pedal. 

168.

A battery load test is being performed. A good battery will remain above:

  • 9.6 volts

  • 12.6 volts 

  • 11.6 volts

  • 8.6 volts 

Correct answer: 9.6 volts

During a load test, the battery is loaded for 15 seconds. During this time, a good battery will remain above 9.6 volts when the temperature is 70 degrees or above. 

169.

A diesel engine exhibits lack of power. Which of the following is the least likely cause?

  • Fuel pressure too high

  • Failed fuel heater

  • Low fuel volume 

  • Failed fuel cooler 

Correct answer: Fuel pressure too high

Fuel pressure that is too low would lead to lack of power, but not fuel pressure that is too high. A failed fuel cooler, a failed fuel heater or low fuel volume are all common reasons for lack of power. 

170.

Technician A says instrument cluster warning lights are turned on when a switch or sensor closes. Technician B says instrument cluster warning lights are turned on when a sensor or switch opens. Who is correct?

  • Technician A 

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Only technician A is correct. Closing a switch or sensor completes the circuit to illuminate the warning light. 

171.

Technician A says a hydro-assist booster system's internal reserve flow switch opens the backup pump electrical circuit when the normal hydraulic flow is interrupted. Technician B says that to check a hydro-assist booster, the brakes should be pumped several times with the engine on. 

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. With a hydro-assist booster, the internal reserve flow switch closes the backup pump circuit when normal hydraulic flow gets interrupted. To check the hydro-assist booster, the brakes need to be pumped several times, but the engine should be off. 

172.

A common-rail diesel engine cranks but doesn't start. Which of the following could be the cause?

  • Worn fuel injectors 

  • A loose battery positive cable 

  • A worn camshaft lobe

  • A hyrdo-locked engine

Correct answer: Worn fuel injectors

If all or most of the fuel injectors are worn, a crank-no-start condition may result. A loose battery cable would result in an engine that doesn't crank at all, as would a hydro-locked engine. A worn camshaft lobe would result in an engine misfire.

173.

Air pressure sensors are a type of:

  • Transducer

  • Thermistor 

  • Hall effect sensor 

  • Potentiometer 

Correct answer: Transducer

Transducers are used to convert pressure into electrical signals. This is exactly what air pressure sensors do: convert air pressure into an electrical signal to be used by the onboard electronics. 

174.

Technician A says air switches are adjustable. Technician B says contaminated air lines can prevent the air switch from operating properly. Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Only technician B is correct. Before replacing the air switch, the lines should be checked for contamination, which can prevent the switch from operating properly. Technician A is wrong because the switches are not adjustable.

175.

To measure hydro-boost pressure, a gauge of at least what rating should be installed?

  • 2.000

  • 500

  • 1,000

  • 1,500

Correct answer: 2,000

Pressure testing can be performed to troubleshoot a faulty hydro-boost pump. A gauge capable of reading at least 2,000 psi should be used to perform this test.

176.

All of the following statements about kingpin bushings are true EXCEPT:

  • They help distribute the vertical load on the kingpin

  • They can be replaced without removing the axle

  • They must be replaced regularly to ensure proper alignment

  • They can be made from composite or metal materials

Correct answer: They help distribute the vertical load on the kingpin

The upper and lower thrust bearings are responsible for distributing the vertical load on the kingpin. The other three answers describe the purpose and construction of the kingpin bushings. 

177.

A driver complains that the steering wheel does not return properly. Which of the following is the most likely cause?

  • Incorrect SAI

  • Incorrect camber

  • Incorrect caster 

  • Incorrect thrust angle

Correct answer: Incorrect SAI

King pin inclination (KPI) or steering axis inclination (SAI) is the inward tilt of the kingpin at the top viewed from the front of the vehicle. Incorrect KPI or SAI typically results in a steering wheel that does not return properly. 

178.

Battery disconnect voltage is typically around how many volts?

  • 10.4 volts

  • 12.2 volts

  • 9.6 volts

  • 8.5 volts

Correct answer: 10.4 volts

Low voltage disconnect systems are used to help prevent the main battery set from discharging too much when starting the truck. The disconnect voltage is typically around 10.4 volts and the reconnect voltage is around 12.2 volts.

179.

All of the following are methods of adjusting valve lash except:

  • Lifter shim adjustment 

  • Adjustable nut attaching the rocker arm to the stud

  • Adjustable screw located in the end of the rocker

  • Pushrod length adjustment 

Correct answer: Lifter shim adjustment

There are several methods for adjusting valve lash, including an adjustable nut attaching the rocker arm to the stud, an adjustable screw located in the end of the rocker, pushrod length adjustment, shims positioned between the camshaft lobes and followers, and removing material from the valve tip.

180.

Pushrod runout should not exceed:

  • .003"

  • .001"

  • .002"

  • .005"

Correct answer: .003"

Runout can be checked by rolling the pushrod across a flat surface, such as a piece of glass. If runout exceeds .003", the pushrod should be replaced. 

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