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Quiz Session - Attempts With Random Questions

ASE L3 Exam Questions

Page 7 of 10

121.

Technician A says auto stop/idle-stop helps achieve better fuel economy in today's vehicles. Technician B says auto stop/idle-stop is only used on hybrid vehicles.

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Only technician A is correct. Today's HEV and non-HEV vehicles achieve great fuel mileage using auto stop/idle-stop.

122.

Technician A says the parking pawl on most hybrid vehicles is applied using a cable. Technician B says the parking pawl on most hybrid vehicles is applied using a gear set. 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. The parking pawl on most hybrid vehicles is applied using an electric motor.

123.

Technician A says it's common to have to test capacitors on HV systems. Technician B says capacitors rarely need to be tested. Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Only technician B is correct. Capacitors rarely need to be tested.

124.

According to the HYBRID/ELECTRIC VEHICLE SPECIALIST CERTIFICATION TEST REFERENCE BLOCKS, all systems are equipped with what voltage battery?

  • 12 volts

  • 390 volts

  • 24 volts

  • 300 volts

Correct answer: 12 volts

All systems are equipped with a 12-volt battery. 

125.

What is the interlock system's purpose?

  • To signal the computer in charge of the HV capacitors if the vehicle has been in a collision 

  • If the service plug has been removed 

  • If the inverter cover is off

  • If there is a high-voltage insulation leak

Correct answer: To signal the computer in charge of the HV capacitors if the vehicle has been in a collision

To determine if the vehicle has been in a collision, the ECU uses information from the interlock system. If a collision is detected, the ECU will open the system's main relays to isolate the high-voltage battery. 

126.

When testing for a loss of isolation, how many volts must the meter send through the system?

  • 1000 volts

  • 500 volts

  • 750 volts

  • 500 volts

Correct answer: 1000 volts

Loss of isolation is tested using a megohmmeter that applies 1000 volts to the system.

127.

Capacitors are similar to what component?

  • Battery

  • Alternator

  • Generator

  • Interlocker

Correct answer: Battery

Capacitors are storage devices similar to batteries.

128.

Technician A says hybrid safety gloves can be tested by rolling them on a bench. Technician B says hybrid safety gloves can be tested by using an air pump. 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. In-shop methods for testing hybrid safety gloves for leaks include rolling them across a bench and testing them with an air pump.

129.

To isolate the HV AC system from the rest of the vehicle, a minimum resistance of how much is required?

  • 500 ohms per volt

  • 1000 ohms per volt

  • 100 ohms per volt

  • 700 ohms per volt

Correct answer: 500 ohms per volt

500 ohms per volt is needed to isolate an AC HV system.

130.

MG windings should be tested for shoults with a meter rated at which of the following?

  • 1/1000 of an ohm

  • 1/100 of an ohm

  • 1/10 of an ohm

  • 1/10000 of an ohm 

Correct answer: 1/1000 of an ohm

Windings should be tested for shorts with a milliohmmeter, which is a meter rated at 1/1000 of an ohm.

131.

All three of the vehicle types (Type-1, Type-2, and Type-3) use what battery chemistry in their high-voltage battery packs?

  • The information is not specified.

  • Lead-acid

  • Nickel-metal hydride (NiMH)

  • Lithium-ion (Li-ion)

Correct answer: The information is not specified.

Information regarding the battery chemistry used in the various vehicle types is not specified. However, most hybrid and electric vehicles currently use lithium-ion (Li-ion) batteries. Some older models use nickel-metal hydride (NiMH) battery technology.

132.

Silicon carbide IGBT's can withstand up to how many volts?

  • 800

  • 1000

  • 500

  • 600

Correct answer: 800

Newer IGBT's made of silicon carbide can handle up to 800 volts.

133.

Technician A says hybrid A/C compressors typically have a clutch. Technician B says some hybrid A/C compressors will not accept aftermarket oils, and an OEM-brand oil must be used. 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, such as Kia and Hyundai, will not accept aftermarket A/C oils, and the OEM-brand must be used. Technician A is wrong because most hybrid A/C compressors are variable scroll and do not need a compressor clutch.

134.

Refer to the ASE Certification Test Reference for this question. Technician A says the Type-1 vehicle uses a planetary gear set connected to each of the drive members. Technician B says the Type-2 vehicle uses a planetary gear set connected to each of the drive members.

Which technician is correct?

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Technician A is correct. Type-1 vehicles use a planetary gear set connected to each of the drive members.

Type-2 vehicles use either a Continuously Variable Transmission (CVT), a manual transmission, or a traditional automatic.

135.

Technician A says Toyota released the first automotive heat pump with the Prius lineup. Technician B says a heat pump is basically an A/C system running backward. Which technician is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Technician B is correct. A heat pump is an A/C system that runs backward. Instead of releasing heat at the condenser, it draws the heat back into the refrigerant so it can be released into the cabin when needed.

Technician A is incorrect because Nissan introduced the first automotive heat pump on the Leaf in 2013. Toyota did create a unique version, known as the "vapor injected" heat pump for the Prius Prime, but not until 2017.

136.

In comparison to an Otto cycle engine, an Atkinson cycle engine does which of the following?

  • Keeps the intake valve open longer

  • Closes the intake valve sooner

  • Keeps the exhaust valve open longer

  • Closes the exhaust valve sooner

Correct answer: Keeps the intake valve open longer

An Atkinson cycle engine keeps the intake valve open longer. This allows some of the cylinder volume to be forced back into the intake manifold to reduce pumping losses.

137.

Technician A says a high-voltage battery can overheat if the SOC drops below 20%. Technician B says a high-voltage battery can overheat if the SOC climbs above 80%. 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 high-voltage battery can overheat if the State Of Charge (SOC) drops below 20% or if the SOC climbs above 80%. For this reason, the SOC is very closely monitored by the control module.

138.

What is the purpose of the positive contactor in a HV system?

  • To connect the HV battery terminal to the HV battery cable

  • To connect the HV battery to the 12-volt battery

  • To connect the HV battery to the HV junction 

  • To connect the 12-volt battery to the alternator

Correct answer: To connect the HV battery terminal to the HV battery cable

The positive contactor connects the positive cable and positive terminal of the HV system.

139.

On all hybrid vehicles, the 12-volt battery is used to do everything except:

  • Power the starter

  • Keep the system memory alive 

  • Power the 12-volt accessories 

  • Enable the high-voltage battery to connect to the hybrid system

Correct answer: Power the starter

Most hybrids do not have a 12-volt starter. Instead, the hybrid motor is used to crank the engine. 

140.

All three of the vehicle types (Type-1, Type-2, and Type 3) use a DC/DC converter. What does this component do?

  • Supplies stepped-down voltage to the vehicle's 12-volt electrical system

  • Provides AC current to the motor/generators

  • Provides DC current to the battery

  • Creates the rotational force needed to drive the vehicle's wheels

Correct answer: Supplies stepped-down voltage to the vehicle's 12-volt electrical system

The DC/DC converter takes high voltage from the hybrid battery and converts it into a stepped-down voltage that the vehicle's 12-volt electrical system can use.

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