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Quiz Session - Attempts With Random Questions

ASE L3 Exam Questions

Page 4 of 10

61.

A hybrid vehicle's 12-volt battery will not hold a charge. All the following could be the cause except:

  • Loose alternator belt

  • Inverter cooling system problems 

  • Corrosion at the inverter high-voltage connectors 

  • Wiring problems 

Correct answer: Loose alternator belt

Hybrid vehicles use a DC/DC converter to charge the 12-volt battery, not an alternator. The DC/DC converter is often located inside the inverter. Therefore, a problem with the inverter may prevent the 12-volt battery from charging.

62.

Technician A says safety cones should be placed around a vehicle when working on the HV system. Technician B says the key/key fob should be located at least 12 feet away from a vehicle during HV system service. Which technician is correct?

  • Technician A

  • Both A and B

  • Technician B

  • Neither A nor B

Correct answer: Technician A

Technician A is correct. Safety cones and warning signs should be placed around a vehicle to notify other people that it is a dangerous area.

Additionally, technician B is incorrect because the key/key fob should always be a minimum of 16.4 feet away from the vehicle during HV system service.

63.

What is the voltage that most manufacturers recommend for the use of PPE when working above? 

  • 50V AC or 50V DC

  • 12V AC or 12V DC

  • 20V AC or 20V DC

  • 220V AC or 220V DC

Correct answer: 50V AC or 50V DC

Most of the manufacturers recommend PPE when working with voltages greater than 50V AC or 50 V DC.

64.

Which wheels should be off the ground when towing an HEV?

  • The drive wheels

  • The rear wheels

  • The front wheels

  • Whichever wheels make it easier to get the vehicle safely attached to the tow truck

Correct answer: The drive wheels

The drive wheels should be off the ground when towing an HEV; otherwise, damage can occur to the vehicle. The drive wheels may be the front, the rear, or all, depending on the vehicle.

65.

Use the ASE Certification Test Reference to answer the following question. Technician A says the Type-1 vehicle uses a 12-volt starter motor to crank the Internal Combustion Engine (ICE). Technician B says the Type-2 vehicle uses MG to crank the internal combustion engine.

Which technician is correct?

  • Technician B

  • Technician A

  • Neither A nor B

  • Both A and B

Correct answer: Technician B

Technician B is correct. The Type-2 vehicle uses a 12-volt starter motor or the MG. The Type-2 only has one MG.

Technician A is incorrect. The Type-1 vehicle uses MG1 to crank the ICE.

66.

While many HVs use a conventional 12V AGM or lead-acid battery to power the conventional electrical system, Tesla introduced a lithium-ion battery with how many volts?

  • 16V

  • 14V

  • 12V

  • 18V

Correct answer: 16V

Tesla released a 16V lithium-ion battery that replaces the role of a standard 12V. It also supports advanced electronics.

For most HVs, the 12V lead-acid or AGM battery is still used for conventional systems.

67.

Technician A says the boost converter raises the supply voltage from the battery. Technician B says all HV and PHEV vehicles use a boost converter. Which technician is correct?

  • Technician A

  • Neither A nor B

  • Technician B

  • Both A and B

Correct answer: Technician A

Technician A is correct. The boost converter is designed to raise the supply voltage from the battery to the motors when needed.

Most HV and PHEV vehicles do not use a boost converter because the voltage is already high enough (400 - 800 volts), so there is no need to boost.

68.

On a J1772 DCFC level 1 ccs charging connector, how many pin ports are there?

  • 7

  • 6

  • 4

  • 8

Correct answer: 7

There are 7 pins on a J1772 connector combo type 1.

69.

What is the optimal target state of charge for a high-voltage battery?

  • 50%

  • 100%

  • 85%

  • 90%

Correct answer: 50%

The State Of Charge (SOC) is a calculation based on battery voltage, temperature, and current. Optimally, the target SOC is 50%, with a range between 20% and 80%.

70.

Technician A says if a high-voltage battery is to be removed, a powertrain lift or battery lift should be used without a battery support fixture. Technician B says a battery can be twisted and damaged if support fixtures are not used correctly, leading to a possible fire. Which technician is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Technician B is correct and technician A is incorrect. While it's important to use proper lifts when removing HV batteries, they must be used with the right battery support fixtures. If not, battery damage and personal injury can occur, possibly leading to a fire.

71.

A technician is checking a high-voltage cable for shorts to ground using a megohm meter on the 500 volt scale. Which of the following readings indicates a high-voltage short to ground?

  • 1 volt

  • 1020 volts 

  • Out of limits (OL) 

  • 500 volts 

Correct answer: 1 volt

A reading of approximately 1 volt indicates there is continuity to ground and a short. A reading of approximately 527 volts indicates a lack of continuity and therefore no short. 

72.

Technician A says a 12V brush-type motor runs EPS units. Technician B says that the HV converter powers the EPS units. Which technician is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. Some EPS units are run with a 12V brush-type motor. Other vehicles use a 42V EPS configuration that receives the voltage from the HV converter.

73.

Technician A says the Type-1 vehicle uses a power split device (clutches). Technician B says the Type-3 vehicle has only one electric motor.

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. Only the Type-3 vehicle uses a power split device (clutches), not the Type-1.

The Type-3 vehicle has two electric motors. The Type-3 hybrid-drive system is considered an extended range electric vehicle.

74.

What is the general manufacturer time frame to allow HV capacitors to discharge before testing the HV system?

  • 5-15 mins

  • 2-4 mins

  • 45-60 mins

  • 15-30 mins

Correct answer: 5-15 mins

Generally, it takes 5-15 minutes for the HV capacitors to discharge.

75.

Technician A says a hybrid transaxle may overheat if there is a problem with the inverter water pump. Technician B says the transaxle may overheat if there is a problem with the inverter thermostat. Who is correct?

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Only technician A is correct. The transaxle may overheat if there is a problem with the inverter cooling system, such as a failed water pump. However, the inverter cooling system does not have a thermostat, so technician B is wrong.

76.

How many size categories are there for automotive HV batteries?

  • Three

  • Two

  • Four

  • Seven

Correct answer: Three

There are three size categories for automotive HV batteries: small, medium, and large.

77.

A typical micro-hybrid system operates on how many volts?

  • 48 volts 

  • 60 volts

  • 110 volts

  • 220 volts 

Correct answer: 48 volts 

The electric motor in a micro-hybrid does not supply power to the wheels. Instead, the motor is used to provide supplemental power to the engine. Most micro-hybrids have 42-volt systems. 

78.

All of the following locations can hold HV fuses, except:

  • Interior fuse box

  • Battery junction block

  • Power distribution box

  • Under the cover of the HV battery

Correct answer: Interior fuse box

The interior fuse box will not have any HV fuses installed. Instead, the HV fuses can be found in the battery junction block, in the power distribution box, in the battery, or under the cover of the HV battery.

79.

All the following are true when removing a rotor from an electric motor except:

  • Clean it with soapy water

  • Store the rotor in a designated box

  • Keep away from dirt and debris due to magnetism

  • Keep the motor away from magnetically sensitive devices

Correct answer: Clean it with soapy water

A rotor should be placed in a designated storage box when removed. 

80.

Technician A says all HV battery systems have a separate cooling system only used for the HV battery. Technician B says all HV vehicles use refrigeration systems to cool the battery compartment. 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. Only some vehicles use refrigerant systems to cool the battery compartment. The Nissan Leaf EV has no cooling system for its HV battery.

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