ASE L3 Exam Questions

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101.

The safety rescue hook is insulated up to how many volts?

  • 1000 volts

  • 2000 volts

  • 500 volts

  • 1900 volts

Correct answer: 1000 volts

The HV rescue hook is an essential PPE and is insulated up to 1000 volts.

102.

To isolate a DC HV system from the rest of the vehicle, how much resistance is needed?

  • 100 ohms per volt

  • 200 ohms per volt

  • 300 ohms per volt

  • 400 ohms per volt

Correct answer: 100 ohms per volt

100 ohms per volt is needed to seperate the HV system on a DC source.

103.

What is another name for System Main Relays (SMRs)?

  • High-voltage contactors

  • High-voltage switches

  • High-voltage connectors

  • High-voltage wires

Correct answer: High-voltage contactors

High-voltage contactors are also called system main relays. Contactors are a part of an HV circuit, so it's important to use typical HV safety precautions when working with them.

While high-voltage switches, connectors, and wires all have a place in the system, they are not referred to as System Main Relays (SMRs).

104.

Technician A says an AGM battery can be charged using a traditional battery charger. Technician B says an AGM type of battery may experience thermal runaway when using a conventional charger. Which technician is correct?

  • Technician B

  • Technician A

  • Neither A nor B

  • Both A and B

Correct answer: Technician B

Only technician B is correct. Absorbent Glass Mat (AGM) batteries must be charged with a specific charger or thermal runaway may occur. However, an AGM charger can be used to charge any type of battery. So, if there is a question as to what kind of 12V battery you can charge, default to using an AGM charger.

105.

Technician A says most hybrids use hydraulic power steering. Technician B says some hybrids use a 42-volt electric power steering system. Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Only technician B is correct. Some hybrids use 12-volt electronic power steering systems and some use 42-volt systems. Technician A is wrong because most hybrids currently use electronic power steering systems; none of these is hydraulic.

106.

Most PHEV and HV vehicles use an HV battery with up to how many cells?

  • 96 

  • 86

  • 76

  • 56

Correct answer: 96

Most HV batteries in vehicles contain up to 96 cells.

107.

On which engine is the expansion ratio higher than the compression ratio?

  • Atkin cycle engine

  • Otto cycle engine

  • Rotary engine

  • Wankel engine

Correct answer: Atkin cycle engine

The Atkin cycle engine has a higher expansion ratio than the compression ratio. Rotary and Wankel engines are not used in HV vehicles.

108.

Technician A says the ICE in a hybrid has a higher compression than Otto cycles. Technician B says Otto cycle engines have a higher compression. Which technician is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Most hybrid vehicles use an Atkinson cycle engine, which has lower compression than Otto cycle engines due to the intake valve being held open longer than usual. For this reason, technician B is correct.

109.

Technician A says jump-starting HEV and PHEV vehicles is always performed the same way. Technician B says jump-starting HEV and PHEV may be different from vehicle to vehicle, and service information should be checked.

  • Technician B

  • Technician A

  • Technician A and B

  • Neither technician A nor B

Correct answer: Technician B 

Technicians should never jump-start a PHEV vehicle without checking the service procedure in a service manual as it may be different from one vehicle to the next.

110.

Technician A says HV vehicles only use AGM 12 volt batteries for the low voltage system. Technician B says HV vehicles use 12V lead-acid or AGM batteries for the low voltage system. Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Only technician B is correct. HV vehicles still use a 12 volt system and can use AGM or lead-acid type batteries.

111.

All the following should be done to disable a high-voltage battery pack except:

  • Disconnect the hybrid control module

  • Remove the service plug

  • Test the high-voltage parts using a CAT III multimeter 

  • Disconnect the 12-volt battery

Correct answer: Disconnect the hybrid control module

Before working on a high-voltage system, the battery must be isolated. In most cases, this procedure includes disconnecting the 12-volt battery, removing the high-voltage service plug, and testing the high-voltage parts using a CAT III multimeter.

112.

High-voltage battery cells are connected in which manner?

  • Series

  • Parallel 

  • Series-parallel 

  • Perpendicular 

Correct answer: Series

Hybrid battery cells are connected in series to create the required high voltage. 

113.

Which type of 12-volt battery includes a glass mat?

  • AGM 12 volt

  • Lead acid 12 volt

  • Lithium-ion 12 volt

  • Nickel-metal hydride 12 volt

Correct answer: AGM 12 volt

 An AGM 12-volt battery includes a glass mat. An AGM 12-volt battery also doesn't "gas" or lose water. 

114.

All the following are true regarding hybrid electric motors except:

  • They carry three alternating currents of different frequencies. 

  • They produce a constant power level throughout each cycle of current.

  • They utilize three circuit conductors that reach their peak values at different times.

  • They can produce a magnetic field that rotates in a specific direction.

Correct answer: They carry three alternating currents of different frequencies.

Hybrid vehicles typically use three-phase AC motors. In this design, three circuit conductors carry an AC current of the same frequency, but different phases. This means the current cycles will reach their peak values at different times. All the other options are true. 

115.

On some hybrid vehicles, a special tool is required to remove which part of the electric motor?

  • Rotor

  • Stator 

  • Armature 

  • Commutator 

Correct answer: Rotor

On some Honda hybrid vehicles, a special tool is required to remove the rotor because of the rotor's strong magnetism.

116.

According to the HYBRID/ELECTRIC VEHICLE SPECIALIST CERTIFICATION TEST REFERENCE BLOCKS, all motor/generators are what phase high voltage?

  • 3-phase AC voltage

  • 2-phase AC voltage

  • 3-phase DC voltage

  • 2-phase DC voltage

Correct answer: 3-phase AC voltage

Block voltage can be viewed on a scan tool. Variation between battery modules should not exceed 0.2 volts. 

117.

Technician A says it is common that the coolant reservoirs for the HEV and ICE to be located close together. Technician B says HEV reservoirs are never located close together.

  • Technician A

  • Both A and B

  • Neither A nor B

  • Technician B

Correct answer: Technician A

Technician A is correct. Often the HEV and ICE cooling system reservoirs are close together. It is important to identify the correct one.

118.

In a typical hybrid system, all the following will happen if the regenerative braking system fails except:

  • The vehicle will go into "limp" mode.

  • The brakes will become harder to press.

  • The brake system warning light will be illuminated.

  • The stopping distance will be increased.

Correct answer: The vehicle will go into "limp" mode.

If the regenerative braking system fails, the hydraulic brake system will still work. The vehicle will not go into limp mode, but the brakes will be harder to press, the stopping distance will increase, and the brake warning light will be illuminated.

119.

Technician A says it is inappropriate to continuously run an ICE for diagnostic purposes. Technician B says there are three methods on the Toyota Prius to keep the engine running. Which technician is correct?

  • Neither A nor B

  • Technician A

  • Technician B

  • Both A and B

Correct answer: Neither A nor B

Both technicians are wrong. Sometimes it is a necessity to run the ICE for diagnostic procedures. However, caution should always be taken when diagnosing an engine with it running.

There are two methods to keep the Toyota Prius ICE running, although other models may have differing methods.

120.

Technician A says prismatic battery cells are of a round shape. Technician B says prismatic battery cells are primarily produced by Sony electric. 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. Prismatic batteries are box-shaped and mostly produced by panasonic electric