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Quiz Session - Attempts With Random Questions

ASE A Series Exam Questions

Page 5 of 25

81.

Planetary gear set transfer cases are being discussed. Technician A says that when gear reduction is needed, the sun gear is often the drive gear and the planet carrier is often the driven gear. Technician B says that to achieve direct 1:1 output from the transfer case, any two planetary components can be locked together.

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. A planetary gear set inside the transfer case includes the sun gear, planet pinions, and ring gear. When gear reduction is needed, the sun gear is often the drive gear and the planet carrier is often the driven gear. To achieve direct 1:1 output from the transfer case, any two planetary components can be locked together.

82.

Regarding a driveshaft U-joint, what is the U-joint working angle?

  • The angle between the driven end and the driving end of the joint 

  • The angle between the yoke and the driving end

  • The angle between the trunnions and the spider

  • The angle between the U-joint and the differential 

Correct answer: The angle between the driven end and the driving end of the joint

Typically, U-joints should have a working angle of 1/2 to 3 degrees. This is the angle between the driving end and driven end of the joint. This angle is essential for proper driveshaft and U-joint longevity and smooth operation. Higher angles can result in driveline vibrations and premature joint failure.

83.

At which wheel should the brake bleeding procedure typically be started?

  • Right rear

  • Left rear

  • Right front

  • Left front

Correct answer: Right rear

Typically, the brake bleeding procedure should be started at the wheel farthest from the master cylinder. Depending on how the brake lines are routed, for most vehicles this is the right rear wheel. The repair manual may include other specific instructions.

84.

Generally, at least how many quarts of ATF flow through the transmission cooler every 20 seconds?

  • 1 quart

  • 2 quarts

  • 3 quarts

  • 4 quarts

Correct answer: 1 quart

If the transmission cooler is working properly, a least 1 quart of ATF should flow through every 20 seconds. If fluid flow is less than this, suspect a restriction in the cooler or lines.

85.

Technician A says the torque converter should be bolted to the flex plate prior to transmission installation. Technician B says the flex plate should be bolted to the back of the engine prior to transmission installation.

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 flex plate should be bolted to the back of the engine prior to transmission installation. Once the transmission is installed, the flex plate can be rotated to line up the bolt holes on the torque converter. The converter can then be secured to the flex plate.

86.

Technician A says grade #2 diesel fuel is suitable for long-haul trucking and automotive diesel applications. Technician B says #1 grade diesel fuel should only be used during the summer.

Who is correct?

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Only technician A is correct. Grade #2 diesel fuel has a higher boiling point and cloud point than grade #1. Because of this, it is specified where high speeds and loads are encountered, such as automotive and long-haul trucking. Technician B is incorrect because the low cloud and pour points of grade #1 make it ideal for use during the winter.

87.

Variable valve timing is being discussed. Technician A says exhaust cam phasing mainly helps the engine produce more power. Technician B says intake cam phasing mainly helps reduce emissions.

Who is correct?

  • Neither A nor B

  • Technician A

  • Technician B

  • Both A and B

Correct answer: Neither A nor B

The variable valve timing (VVT) on most systems uses an electronically controlled cam phaser. This phaser can alter the relationship of the camshaft from 15 degrees retard to 25 degrees advance. Both technicians are incorrect: exhaust cam phasing mainly helps reduce exhaust emissions, and intake cam phasing mainly helps the engine produce more power. 

88.

Technician A says desiccant is added to refrigerant for lubrication purposes. Technician B says esters are used to absorb moisture from the AC system.

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. PAG oil, not desiccant, is added to refrigerant for lubrication purposes. Desiccant, not esters, is used to absorb moisture from the AC system.

89.

The fluid level on an automatic transmission registers at the "add" mark. Generally, this indicates the fluid is down by how much?

  • 0.5 quarts

  • 0.25 quarts

  • 0.75 quarts

  • 1 quart 

Correct answer: 0.5 quarts

Generally, if the automatic transmission fluid level is to the "add" mark on the dipstick, it is about 0.5 quarts low. 

90.

All of the following are HVAC control module outputs except:

  • Sunload sensor 

  • Blower motor

  • AC compressor 

  • Blend door 

Correct answer: Sunload sensor

The HVAC control module takes inputs from several sensors, including the sunload sensor. It then uses the information from these sensors to control various outputs including the blower motor, AC compressor and blend door.

91.

Which type of limited slip differential uses silicone fluid to allow speed difference between two shafts?

  • Viscous coupling 

  • Cone-type 

  • Torsen 

  • Eaton ELocker

Correct answer: Viscous coupling

Viscous coupling differentials use a series of plates that do not touch each other. Half of the plates attach to the case, and the other half attach to the side gears. The plates are kept in a chamber full of silicone-based fluid. This silicone allows for some speed difference between the two shafts, but excessive differences induce shear forces in the fluid, nearly locking the two sets of plates together.

92.

All of the following are symptoms of improper caster except:

  • Direct tire wear

  • Steering pull

  • Steering wander

  • A rough ride

Correct answer: Direct tire wear

Improper caster will not directly affect tire wear. It can, however, cause other issues such as steering pull and steering wander. Caster that is excessively positive can also cause a rough ride when you're driving over rough road surfaces.

93.

What kind of head gasket is not likely to be used on a modern engine with aluminum heads and a cast iron block?

  • Shim steel

  • Perforated metal core

  • Multilayer steel (MLS)

  • Graphite

Correct answer: Shim steel

Because aluminum and cast iron expand and contract at different rates, the differential would grind down a shim steel head gasket. This wasn't a problem with older cast iron cylinder heads mounted on cast iron blocks, which expanded at the same rate.

Multilayer steel, graphite, and perforated metal core head gaskets allow for some slip without wearing on gasket facings or creating head gasket leaks.

94.

What is valve spring installed height? 

  • The distance between the spring seat and the underside of the valve spring retainer

  • The distance between the spring seat and the valve seat

  • The distance between the spring retainer and the rocker arm

  • The distance between the spring retainer and the valve stem

Correct answer: The distance between the spring seat and the underside of the valve spring retainer

Valve spring installed height is the distance between the spring seat and the underside of the valve spring retainer. This measurement is taken during cylinder head rebuilding because, after machining, the top of the valve projects farther than before.

95.

Limp mode generally places the transmission in which gear?

  • 2nd or 3rd gear

  • 1st or 2nd gear

  • 3rd or 4th gear

  • 4th or 5th gear

Correct answer: 2nd or 3rd gear

Default, or limp, mode is used if there is a failure in the transmission electronics. This mode places the transmission in 2nd or 3rd gear to prevent damage to the system.

96.

Which of the following should be checked before performing an alignment?

  • All of these

  • Excess baggage in the trunk

  • Dragging brakes

  • Worn control arm bushings

Correct answer: All of these

Before performing an alignment, numerous checks should be made to ensure the alignment can be properly done. These include, but are not limited to:

  • Checking the trunk for excess baggage (which could affect ride height)
  • Checking for dragging brakes (which could cause the vehicle to pull to one side)
  • Checking for worn control arm bushings (which could directly affect steering angles)

97.

Technician A says that to reduce oversteer, front tire pressure should be decreased. Technician B says that to reduce understeer, front tire pressure should be decreased.

Who is correct?

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Only technician A is correct. To reduce oversteer (too much traction in front), front tire pressure should be decreased and rear tire pressure increased. To reduce understeer (not enough traction in front), front tire pressure should be increased and rear tire pressure decreased.

98.

The purpose of an auxiliary electric water pump is to:

  • Heat the interior 

  • Cool the engine

  • Cool the hybrid electronics 

  • Cool the EGR valve

Correct answer: Heat the interior

Some vehicles have an auxiliary electric water pump to heat the interior. The auxiliary pump operates at idle speeds when the engine-driven water pump does not circulate enough coolant through the heater core.

99.

A diesel oxidation catalyst is designed to reduce all of the following except:

  • CO2

  • CO

  • NOx

  • HC

Correct answer: CO2

A diesel oxidation catalyst consists of a honeycomb-style structure that is coated in a layer of catalyst material. The catalyst chemicals react with the exhaust gas to reduce CO, HC, and NOx.

100.

All of the following are true regarding spool valves except:

  • Fluid flow is permitted by the lands 

  • They were named after a spool of thread

  • The larger-diameter portion of the valve is called the land

  • The smaller-diameter portion of the valve is called a valley or groove

Correct answer: Fluid flow is permitted by the lands

Fluid flow is blocked by the lands. All of the other options are true: spool valves were named after a spool of thread, the larger-diameter portions of the valves are called lands, and the smaller-diameter portions of the valves are called valleys or grooves.

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