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Quiz Session - Attempts With Random Questions

ASE A Series Exam Questions

Page 8 of 25

141.

Which of the following is false regarding compression testing?

  • Compression readings that improve during a "wet" compression test indicate defective valves

  • The ignition system should be disabled prior to performing the test

  • A low reading on the initial puff indicates potentially weak piston rings

  • All cylinders should measure within 10% of each other

Correct answer: Compression readings that improve during a "wet" compression test indicate defective valves

Compression readings that improve during a "wet" compression test indicate defective piston rings, not defective valves.

The other options are all true: the ignition system should be disabled prior to performing the test, a low reading on the initial puff indicates potentially weak piston rings, and the difference between the highest reading and lowest reading should be within 10%.

142.

Technician A says if the starter rotates slowly, there could be low resistance in the battery cables. Technician B says if the starter creates a grinding noise, the starter brushes may be worn.

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. If the starter rotates slowly, possible causes include high cable resistance, low battery or worn starter bushings.

If the starter is grinding, possible causes include a defective drive unit, bad flywheel or an incorrect clearance between the flywheel and the starter drive. 

143.

A spring-loaded ball check valve is an example of what?

  • One-way valve

  • Flow-directing valve 

  • Manual valve

  • Switching valve

Correct answer: One-way valve

A spring-loaded ball check valve is an example of a one-way valve. One-way valves are found in the valve body and are designed to allow fluid to flow in only one direction. To accomplish this, a spring holds the ball against its seat until fluid pressure overcomes spring force and the ball moves. In other words, fluid flows through the valve as long as hydraulic pressure exceeds the force of the spring.

144.

The accumulator is designed to do all of the following except:

  • Provide a restriction that separates the low- and high-pressure sides

  • Prevent liquid refrigerant from entering the compressor

  • Hold a reserve of refrigerant 

  • Hold desiccant to remove moisture

Correct answer: Provide a restriction that separates the low- and high-pressure sides

The accumulator is used on systems that use an orifice tube. It can be found between the evaporator and the compressor. The accumulator is designed to prevent liquid refrigerant from entering the compressor, to hold a reserve of refrigerant, and to hold desiccant to remove moisture.

The restriction between high side and low side in this system would be the fixed orifice tube.

145.

Dual clutch transmissions (DCTs) are being discussed. Technician A says one clutch drives the odd-numbered gears and the other clutch drives the even-numbered gears. Technician B says a DCT is shifted with a shift lever just like a manual transmission.

Who is correct?

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

In a DCT, the general shifting scheme is sequentially shifting one gear up or down. By arranging the clutches on even-gear and odd-gear shafts, switching from 2nd to 3rd or from 3rd to 4th is nearly instantaneous, because the transmission controller has only to switch clutch engagement to effect the shift.

Technician B is incorrect because DCTs are controlled electronically and hydraulically.

146.

All of the following are true regarding diaphragm spring pressure plates except:

  • They lose clamping force as the friction disc wears

  • They use Belleville springs 

  • It is the most common pressure plate design

  • They typically weigh less than spring plates

Correct answer: They lose clamping force as the friction disc wears

Instead of losing clamping force like spring plates do, diaphragm plates increase clamping force as the friction disc wears. (Clamping force increases until the clutch wears to about half its original thickness, then begins to decrease again.)

All of the other options are true: diaphragm plates use Belleville springs, are the most common pressure plate design, and typically weigh less than spring plates.

147.

CV axles are being discussed. Technician A says the inner joint allows 40 degrees or more of movement for the front wheels to turn. Technician B says the outer CV joint allows the front wheels to move up and down during regular suspension travel.

Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Only technician B is correct. The outer CV joint allows for up to 40 degrees of articulation for both suspension travel and front wheel turning.

148.

Higher levels of CO2 in the exhaust stream indicate:

  • Complete combustion 

  • A lean condition 

  • Low combustion temperatures

  • A rich condition 

Correct answer: Complete combustion

Carbon dioxide (CO2) is a measurement of efficiency. The higher the level of CO2 in the exhaust stream, the more efficiently the engine is operating. Acceptable levels are considered between 12% and 15%.

149.

The resistance of most linear shift solenoids is:

  • 4 to 6 ohms 

  • 1 to 2 ohms 

  • 60 to 80 ohms 

  • Over 10K ohms 

Correct answer: 4 to 6 ohms

Linear solenoids are pulse-width modulated for precise fluid control. The internal resistance of these solenoids is generally between 4 and 6 ohms.

150.

All of the following are true regarding wide-band O2 sensors EXCEPT: 

  • They can only react to exhaust mixtures that are richer or leaner than lambda 1.00

  • They can detect exhaust mixtures as rich as 10:1

  • They can detect exhaust mixtures as lean as 23:1

  • They have cold start activity within as little as 10 seconds 

Correct answer: They can only react to exhaust mixtures that are richer or leaner than lambda 1.00

Conventional, not wide-band, O2 sensors can only react to exhaust mixtures that are richer or leaner than 14.7:1 (lambda 1.00).

Wide-band sensors are intended to improve on this design by detecting mixtures over a much broader rage. A wide-band sensor is capable of detecting exhaust gases between 10:1 and 23:1. An additional benefit is that wide-band sensors can begin cold start activity within as little as 10 seconds.

151.

All of the following are ways of checking for a failed head gasket except:

  • Look for blue smoke coming from the tailpipe 

  • Look for bubbles in the coolant

  • Use an exhaust gas analyzer 

  • Perform a chemical test on the coolant

Correct answer: Look for blue smoke coming from the tailpipe

Blue smoke coming from the tailpipe indicates that the engine is burning oil. This is typically caused by problems such as worn rings, worn valve guides, or damaged cylinders.

A failed head gasket may be identified by white exhaust smoke, bubbles in the coolant, exhaust gas analyzer readings, or chemical test (combustion leak tester).

152.

All of the following are inputs to the TCM except:

  • Shift solenoids 

  • Transmission range sensor 

  • Crankshaft position sensor

  • Mass air flow sensor 

Correct answer: Shift solenoids

The TCM takes inputs from various sensors, such as the transmission range sensor, crankshaft position sensor, and mass airflow sensor. Using information from these sensors, the TCM controls transmission actuators, such as the shift solenoids.

153.

Typically, all of the following are part of the combination valve except:

  • Fluid level switch

  • Metering valve 

  • Proportioning valve 

  • Pressure-differential switch

Correct answer: Fluid level switch

Most vehicles combine the proportioning valve with one or more other valves into a unit called a combination valve. The metering valve, proportioning valve and pressure-differential switch are often included. The fluid level switch is necessarily included in the reservoir.

154.

All of the following valve stem-to-guide clearance measurements are within specification except:

  • Intake valve: 0.005" 

  • Exhaust valve: 0.002"

  • Intake valve: 0.003"

  • Exhaust valve: 0.004"

Correct answer: Intake valve: 0.005" 

General recommendations for valve stem-to-guide clearance is 0.001" to 0.003" for intake valves and 0.002" to 0.004" for exhaust valves. 

155.

Technician A says direct injection systems often produce fewer exhaust emissions than port injection systems. Technician B says gasoline direct injection systems allow the use of lower-octane gas.

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. Direct injection creates lower combustion chamber temperatures that directly affects exhaust emissions. Octane ratings are based on resistance to detonation. Detonation is affected by heat. Since the temperatures in direct injection engines are cooler, a lower octane fuel could be used.

156.

Technician A says radial ply tires have plies that overlap at an angle. Technician B says bias-ply tires have plies that lie directly from bead to bead.

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. Bias plies run diagonally, and radial plies run perpendicular to the beads.

157.

Technician A says corroded front brakes could cause the rear brakes to lock up. Technician B says contaminated rear brake shoes could cause the rear brakes to lock up.

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. Contaminated brake linings could cause rear brakes to lock up. Corroded front brakes could also cause rear brake lock-up, because the driver has to use greater force when applying the brakes, resulting in higher brake pedal pressure and rear wheel lock-up.

158.

What is scrub radius?

  • The distance between the line through the steering axis and the center line of the wheel where it contacts the road

  • The inward tilt of the steering axis

  • The tilt of the steering axis in reference to a vertical line as viewed from the side of the vehicle

  • The tilt of the wheels as viewed from the front of the vehicle

Correct answer: The distance between the line through the steering axis and the center line of the wheel where it contacts the road

Scrub radius is the distance between the line through the steering axis and the center line of the wheel where it contacts the road.

SAI is the inward tilt of the steering axis. Caster is the tilt of the steering axis in reference to a vertical line as viewed from the side of the vehicle. Camber is the tilt of the wheels as viewed from the front of the vehicle.

159.

LRR tires are most often used on what type of vehicle?

  • Hybrids 

  • Light trucks

  • Performance vehicles 

  • Passenger cars

Correct answer: Hybrids

Low rolling resistance (LRR) tires reduce rolling resistance for improved fuel economy. This type of tire is often used on hybrid and electric vehicles, but is also available for sedans and other vehicles.

160.

Technician A says exhaust back pressure can be tested with a vacuum-pressure gauge. Technician B says at idle, back pressure should be less than 1.5 PSI.

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. Exhaust back pressure can be tested with either a vacuum-pressure gauge or a pressure gauge. Back pressure should be less than 1.5 PSI at idle and 2.5 PSI at 2,500 rpm.

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