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Quiz Session - Attempts With Random Questions

ASE L3 Exam Questions

Page 5 of 10

81.

A milliwatt is how many ohms?

  • 1/1,000th of an ohm

  • 1/10,000th of an ohm

  • 1/100th of an ohm

  • 1/10th of an ohm

Correct answer: 1/1,000th of an ohm

A milliwatt is 1/1,000th of an ohm.

82.

A two-mode hybrid truck will not crank after a transmission service was performed. Which of the following is the most likely cause?

  • The interlock safety system was interrupted.

  • The 12-volt battery is dead.

  • The electric motor has failed.

  • The transmission fluid level is incorrect. 

Correct answer: The interlock safety system was interrupted.

During a transmission service on a vehicle, such as a GM two-mode hybrid truck, it's common for the safety cover to be removed. This interrupts the interlock circuit, resulting in a vehicle that won't start. 

83.

MG problems typically fall into how many categories?

  • 4

  • 2

  • 3

  • 1

Correct: 4

The four categories are as follows: inoperative, noise, shudder, or overheating.

84.

Technician A says voltage balancing must be performed with a scan tool on all vehicles. Technician B says some vehicles require a special tool to perform voltage rebalancing. Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Only technician B is correct. Balancing is different from vehicle to vehicle. Some GM and Toyota vehicles require a special Midtronics tool to perform balancing. 

85.

Which battery uses the process called recombination?

  • AGM

  • Lead-acid

  • Lithium ion

  • Ni-MH

Correct answer: AGM

AGM batteries use a process called recombination.

86.

Technician A says that the EVAP system in most hybrids is different from the conventional vehicle. Technician B says that the 2006 Prius can be difficult to fill up with fuel when the tank is low. Which technician is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

The main purpose of the evaporative emissions control system (EVAP) is to trap HydroCarbon (HC) emissions and prevent them from being released into the atmosphere. Hybrids and traditional ICE vehicles have similar EVAP systems, making Technician A incorrect.

The exception to this rule is with the 2001-2009 Toyota Prius. This EVAP uses a bladder tank that expands when fuel gets added, making it more difficult to fill up when levels are low, showing that technician B is correct.

87.

Technician A says megohmmeter can create a potentially dangerous amount of voltage. Technician B says megohmmeter should be used on a live circuit. Who is correct?

  • Technician A 

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Only technician A is correct. A megohmmeter produces a large, potentially dangerous amount of voltage. Since a megohmmeter produces its own voltage, all power should be removed from the circuit prior to testing.

88.

Three-phase hybrid AC motors are being discussed. Technician A says the rotor contains the field coil windings. Technician B says the stator contains the permanent magnets. Who is correct?

  • Neither A nor B

  • Both A and B

  • Technician A

  • Technician B

Correct answer: Neither A nor B

Both technicians are wrong. In a three-phase hybrid AC motor, the stator contains the field coil windings, and the rotor contains the permanent magnets. 

89.

A code P3009 is set, indicating a high-voltage leak. Technician A says this could be caused by dirty transmission fluid. Technician B says this could be caused by a stator winding shorted to ground. 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 leak code can be set anytime current leakage from the high-voltage system is detected by the ECU. Since the motors are housed in the transmission of many hybrid vehicles, moisture or metal in the transmission fluid can set a P3009. A stator winding shorted to ground can also set the code.

90.

In the Gen 1 Toyota Prius, MG1 is connected to which member of the planetary gear set?

  • Sun gear 

  • Ring gear

  • Planet carrier

  • Final drive gears 

Correct answer: Sun gear

In the Toyota Prius, Motor-Generator 1 (MG1) is connected to the sun gear, MG2 is connected to the ring gear, and the Internal Combustion Engine (ICE) is attached to the planet carrier. MG1 turns the sun gear to start the ICE, and MG2 is connected to the drive wheels. For reverse, MG2 is turned backward.

91.

Technician A says if a 12V battery is found inside the passenger compartment or trunk, it must be externally vented. Technician B says the 12V battery can't be jumped using a traditional jump box. Which technician is correct?

  • Technician A

  • Both A and B

  • Technician B

  • Neither A nor B

Correct answer: Technician A

Technician A is correct. Many hybrids have a 12V battery in the trunk or passenger compartment, but these batteries must have external venting.

Technician B is incorrect because the 12V battery can be jumped with a traditional jump box, just as you would do with a conventional ICE vehicle.

92.

Capacitors are measured in what units?

  • Farads

  • Ohms

  • Volts

  • Amps

Correct answer: Farads

Capacitors use Farads to measure storage potential.

93.

Technician A says Otto cycle engines will show lower vacuum readings than Atkinson cycle engines. Technician B says Otto cycle engines will show high vacuum readings. Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Otto cycle engines will show more vacuum than Atkinson cycle engines due to the Atkinson cycle keeping the intake valve open for an extended period of time.

94.

Technician A says many HEV and PHEV ICEs use the Atkinson cycle. Technician B says most conventional gasoline engines use the Otto cycle ICE. Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Many HEV and Phev ICEs use the Atkinson cycle as compared to the conventional gasoline engine that uses the Otto cycle.

95.

The Type-3 vehicle is being discussed. Technician A says the internal combustion engine (ICE) drives MG2 to maintain the hybrid battery pack. Technician B says MG2 provides vehicle propulsion and electrical regeneration while braking.

Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Only Technician B is correct. MG2 provides vehicle propulsion and electrical regeneration while braking. 

Technician A is incorrect because the internal combustion engine (ICE) drives MG1, not MG2, to maintain the hybrid battery pack.

96.

All the following are true regarding a hybrid Internal Combustion Engine (ICE) EXCEPT which of the following?

  • The ICE is used to charge the 12V battery.

  • Most engines are Atkinson cycle ICEs.

  • The ICE may start at any time during service.

  • The ICE may start in an attempt to charge the hybrid battery.

Correct answer: The ICE is used to charge the 12V battery.

Unlike a typical gasoline-only vehicle, the ICE does not need to be turning for the 12V battery to charge in a hybrid ICE. This is because the battery is not charged by an alternator. Instead, the 12V battery is charged by the DC-to-DC converter.

The majority of internal combustion engines installed in a hybrid are Atkinson cycle. It's also true that the ICE can start at any time during service.

97.

Technician A says the stator on HV electric motors contains 4 windings. Technician B says transmission fluid is used to cool the windings. 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 stator has 3 windings, which are cooled by transmission fluid being sprayed on them.

98.

From the battery, the IGBTs inside the inverter receive which of the following?

  • High DC voltage 

  • Low DC voltage 

  • High AC voltage 

  • Low AC voltage 

Correct answer: High DC voltage

The Insulated Gate Bipolar Transistors (IGBTs) receive high DC voltage from the hybrid battery. 

99.

Which type of refrigerant oil should be used in a hybrid A/C system?

  • POE

  • PAG

  • Mineral 

  • Alkylbenzene

Correct answer: POE

Hybrids require polyol ester oil (POE). Using traditional PAG oil in a hybrid A/C system can result in major damage.

100.

Typically, how long should you wait to service a high-voltage system after removing the service plug? 

  • 5 to 10 minutes 

  • 10 to 20 minutes 

  • 30 to 45 minutes 

  • 45 minutes to an hour

Correct answer: 5 to 15 minutes

Typically, you need to wait 5 to 15 minutes to service a high-voltage system after removing the service plug. 

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