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Quiz Session - Attempts With Random Questions

ASE A Series Exam Questions

Page 7 of 25

121.

Which of the following should be removed when leak-testing the evaporator?

  • The blower motor resistor 

  • The condenser 

  • The heater core

  • The orifice tube 

Correct answer: The blower motor resistor

The resistor is almost always upstream of the evaporator. Removing the blower motor resistor may ease access to the evaporator for testing.

122.

Two technicians are inspecting clutch components during an automatic transmission rebuild. Technician A says all of the clutch steel discs should be replaced if any of them show heat discoloration. Technician B says if a friction disc shows signs of glazing, the entire set should be replaced.

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 any of the clutch pack steel or friction discs show signs of excessive wear, such as heat discoloration or glazing, the entire set should be replaced. 

123.

Technician A says absolute humidity is the percentage of how much moisture is in the air compared to how much moisture the air is capable of holding. Technician B says relative humidity can be measured with a psychrometer.

Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Only technician B is correct. Absolute humidity is the measurement of the weight of water vapor in a given amount of air, such as g/m³. Relative humidity is the percentage of how much moisture is in the air compared to how much moisture the air is capable of holding, given as x% humidity. Relative humidity can be measured with a hygrometer or a psychrometer.

124.

Technician A says a grinding noise while turning usually indicates a defective drive pinion bearing. Technician B says a whining noise while cruising indicates a worn axle bearing.

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. A grinding noise while turning usually indicates a worn axle bearing. A whining noise while cruising indicates a defective drive pinion bearing.

125.

Technician A says many ABS systems can be bled using a scan tool. Technician B says DOT 5 brake fluid should never be used in ABS systems.

Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Many ABS systems can be bled using a scan tool with OEM capabilities. DOT 5 brake fluid should not be used in ABS systems because it aerates too easily.

126.

What is the normal API gravity for #1 diesel fuel?

  • 39 to 44

  • 17 to 21

  • 56 to 62

  • 78 to 86

Correct answer: 39 to 44

The density (specific gravity) of diesel fuel should be measured if there is a driveability concern. The density is measured in units of API gravity. The normal API gravity for #1 diesel fuel is 39 to 44, and the API gravity for #2 diesel fuel is 30 to 39.

127.

A customer complains of an engine vibration. The technician unbolts the torque converter from the flex plate and starts the engine. The vibration is gone.

Which of the following is the most likely cause?

  • Faulty front pump

  • Broken motor mount

  • Defective crankshaft dampener 

  • Faulty balance shaft 

Correct answer: Faulty front pump

One method of pinning down the cause of a vibration is to unbolt the torque converter from the flex plate and run the engine. If the vibration disappears, the problem is in the torque converter, front pump, or other transmission component that is constantly turning with the engine running. If the vibration remains, the cause is due to an engine or accessory problem.

128.

During which torque converter phase is the turbine traveling at nearly the same speed as the impeller while rotary flow is much greater than vortex flow?

  • Coupling 

  • Multiplication 

  • Stall 

  • Overdrive 

Correct answer: Coupling

During the coupling phase of torque converter operation, the turbine is traveling at nearly the same speed as the impeller, rotary flow is much greater than vortex flow, and torque multiplication stops. It is important to note that the impeller, or converter pump, is driven by the engine, forcing ATF through the turbine, which is connected to the automatic transmission input shaft.

129.

Technician A says a liquid is a substance that can be easily compressed. Technician B says a vapor changes to a liquid if the temperature falls below the boiling point.

Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Only technician B is correct. A vapor, not a liquid, is a substance that is easily compressed. And a vapor changes to a liquid if the temperature falls below the boiling point.

130.

Tread depth on a new tire generally measures how much?

  • 11/32"

  • 8/32"

  • 5/32"

  • 17/32"

Correct answer: 11/32"

Most tires measure 11/32" tread depth when new. However, depending on the manufacturer, this can vary from 9/32" to 15/32", and even more for off-road tires.

131.

The power steering pressure relief valve typically opens between:

  • 750 and 1400 PSI

  • 150 and 250 PSI

  • 250 and 450 PSI

  • 450 and 600 PSI

Correct answer: 750 and 1400 PSI

Power steering pressure increases when the wheel is turned to lock in either direction. The pressure relief valve opens to handle this excess pressure. Generally, this happens somewhere between 750 and 1400 PSI, depending on the application.

132.

Two technicians are discussing valve seat width. Technician A says an excessively wide valve seat tends to develop deposits that can keep the valve from closing. Technician B says if the valve seat is too narrow, it can lead to valve burning.

Who is correct?

  • Both A and B

  • A only

  • B only

  • Neither A nor B

Correct answer: Both A and B

Valves with narrow valve seat widths do not transfer sufficient heat to the cooling jacket. Wider valve seats can develop deposits which may interfere with valve seating.

133.

Technician A says rear toe can cause a pull condition. Technician B says front toe can cause a pull condition.

Who is correct?

  • Neither A nor B

  • Technician B

  • Both A and B

  • Technician A

Correct answer: Neither A nor B

Neither technician is correct. Toe is the measured difference between the front and rear of the tires. Incorrect toe does not cause a pulling condition, but it will result in abnormal tire wear and an off-center steering wheel. 

134.

A tapping noise is heard upon start-up that goes away when the engine is warm. The noise is most noticeable at idle.

Which of the following is the most likely cause?

  • Piston slap

  • A cracked flex plate

  • Excessive rod-bearing clearance

  • Main bearing noise

Correct answer: Piston slap

Piston slap is generally described as a tapping noise. The noise is most noticeable upon start-up and goes away as the engine warms up and the piston expands. In extreme cases, piston slap will only diminish as the engine warms.

Rod-bearing noise is usually described as a metallic rapping that is proportional to engine speed. A cracked flex plate typically makes a rattling noise that changes intensity when the gear selector is moved. Main bearing noise is usually described as a deep metallic knocking.

135.

Which of the following is false regarding high compression engines?

  • They require more advanced ignition timing to prevent spark knock

  • They can produce more power than lower compression engines

  • They can be difficult to crank, especially when hot

  • They can achieve better fuel economy than lower compression engines

Correct answer: They require more advanced ignition timing to prevent spark knock

A high compression engine requires less ignition advance to prevent spark knock. High compression engines do produce more power, get better fuel economy, and are harder to crank.

In a lower compression engine, more ignition advance is possible without spark knock.

136.

Two technicians are discussing valve seating. Technician A says poor valve seating can be caused by hard carbon deposits. Technician B says insufficient valve clearance can lead to poor valve seating.

Who is correct?

  • Both A and B

  • Technician B

  • Technician A

  • Neither A nor B

Correct answer: Both A and B

Technician A is correct. Poor valve seating can be caused by hard carbon deposits. Technician B is also correct. Valve clearance decreases as the engine heats up. If valve clearance is insufficient, the valve may not fully seat when hot.

137.

Technician A says jumper wires are meant to locate open electrical circuits on the power side or ground side of a circuit. Technician B says when a component operates only if the jumper is installed between the component and a good ground, it indicates an open ground circuit.

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. Jumper wires help locate open electrical circuits on the ground or power side of a circuit.

To troubleshoot an electrical component that's not operating, the jumper wire can be attached between a good ground and the component. If the component operates with this jumper installed, there's an open ground circuit present. 

138.

Gear reduction takes place inside the transfer case in which driving mode?

  • 4L

  • 4H

  • 2H

  • 2L

Correct answer: 4L

4L (four low) is four-wheel drive with gear reduction, usually 2:1. This is usually used in low speed, low traction situations. The other transfer case selections are 4H and 2H. "2L" does not exist as an option.

  • 4H is four-wheel drive without gear reduction.
  • 2H is two-wheel drive without gear reduction.

139.

Technician A says tires should be inflated to the pressure number molded on the sidewall of the tire. Technician B says the inflation number listed on the doorpost placard is the maximum pressure when the tire is cold.

Who is correct?

  • Neither A nor B

  • Technician A

  • Technician B

  • Both A and B

Correct answer: Neither A nor B

Both technicians are incorrect. Most modern vehicles have the recommended, not maximum, tire inflation figures listed on a placard on the doorpost. The pressure number listed on the sidewall is the maximum pressure when the tire is cold.

Tire pressure should be set to the automaker's recommended cold tire pressure, listed on the vehicle's tire placard or owner's manual, which cannot exceed the maximum tire pressure, listed on the side of the tire.

140.

What type of piston uses replaceable wrist pin clips?

  • Full floating

  • Press fit 

  • Taper face

  • Positive twist

Correct answer: Full floating

Full floating pistons use wrist pins held in by clips.

Pressed fit wrist pins are held by interference with the connecting rod small end. Taper face and positive twist are piston ring types, not piston types.

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