Deck 35: Hybrid Vehicles

Question 1

Technician A says most hybrids also have an auxiliary 12-volt battery to power conventional electrical items, such as lighting, wipers, sound systems, etc. Technician B says the DC-DC converter reduces some of the high voltage DC from the battery pack to 12-volt DC in order to charge the auxiliary 12-volt battery. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Answer 1

C

Question 2

A parallel hybrid can run on just the engine, just the batteries, or a combination of the two.

Answer 2

False

Question 3

HEV air-conditioning systems are identical to those used in a conventional vehicle.

Answer 3

False

Question 4

On a Honda hybrid, the IMA [integrated motor assist] unit is located ______.

A) between the engine and transmission
B) on the engine block where the alternator is normally located
C) inside the transaxle
D) inside the bellhousing

Question 5

In a parallel hybrid, the engine never directly powers the vehicle.

Question 6

When depowering the high-voltage battery system of a hybrid vehicle, _____.

A) lineman's gloves should be worn
B) never wear anything metallic [jewelry]
C) wait at least five minutes after disconnecting the HV batteries before working on the vehicle electrical system
D) all answers are correct

Question 7

A gasoline engine provides more torque at lower speeds than an electric motor.

Question 8

All hybrids that have an electric motor inside the transmission.

Question 9

A hybrid vehicle may have battery voltages over 200 volts.

Question 10

While discussing the other classifications for the extended EV, the Chevy Volt: Technician A says it can be called a plug-in hybrid. Technician B says it can be called a parallel hybrid. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 11

Because of the memory effect, nickel-metal-hydride [Ni-MH] type batteries are never used in hybrid vehicles.

Question 12

Which of the following is NOT true concerning the Power-Split System currently used on Ford, Nissan, and Toyota hybrid vehicles?

A) The power-split device unit functions as a continuously variable transaxle [CVT]
B) It does not have a torque converter or clutch
C) The power-split unit is comprised of a planetary gear set and two electric motors
D) Belts and pulleys are used to reduce speed and increase transmission torque output

Question 13

Technician A says a motor converts electrical energy into mechanical energy. Technician B says an engine converts chemical energy into mechanical energy. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 14

Hybrid vehicles are being discussed. Technician A says in a series hybrid the engine is there only to extend the vehicle's driving range. Technician B says in a parallel hybrid the electric motor and batteries are the main power source during normal driving conditions. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 15

Which of the following is NOT an advantage of a hybrid vehicle?

A) 90 percent fewer emissions
B) zero CO₂ emissions
C) increased fuel economy
D) improved acceleration performance

Question 16

The high voltage wiring in a hybrid vehicle is identified by the _____ colored wiring harness cover.

A) orange
B) red
C) violet
D) pink

Question 17

The integrated starter alternator damper (ISAD) system replaces the conventional starter, generator, and transmission.

Question 18

The Hyundai Sonata Hybrid uses BAS and ISAD systems.

Question 19

General Motors eAssist system is based on a BAS system.

Question 20

Technician A says Ford hybrid SUV's with 4WD have an additional motor in the rear axle. Technician B says Ford's Energi models are plug-in hybrids. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 21

While discussing the DC-DC converter used in most hybrids: Technician A says that it changes some of the DC voltage from the battery module to an AC voltage for the electric motors. Technician B says that it provides the power to operate the car's 12 -volt electrical system and accessories. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 22

Any vehicle that combines two or more sources of power is called a ___________________.

Question 23

Technician A says hybrid vehicles have an electric water pump to circulate coolant through the heater core when the engine is stopped. Technician B says some hybrid vehicles have a hot coolant storage tank to provide heat for the passenger compartment when the engine is shut down. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 24

Technician A says diesel engines can be used in a hybrid powertrain. Technician B says a gasoline engine is normally used in hybrid powertrain. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 25

Which of the following statements about the high voltage circuits in a Honda Hybrid is NOT true?

A) All of the high-voltage cables are covered in orange sleeves for easy identification.
B) You should always follow the disarming of the high-voltage systems before performing any service work on or near the high-voltage circuits.
C) There is a main switch on the instrument panel that is used to disconnect the battery module from
The rest of the car.
D) There are three large capacitors in the MDM that will take at least 5 minutes to discharge after the
Switch is turned off.

Question 26

While discussing regenerative braking: Technician A says the regenerative system can completely stop the vehicle in order to generate a maximum amount of electricity. Technician B says since most hybrids are FWD vehicles, the rear wheels are designed to claim the most kinetic energy. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 27

Which of the following is the least likely to decrease fuel consumption of a hybrid vehicle?

A) Low-rolling resistance tires
B) Increased aerodynamic drag
C) Stop-start systems
D) Lighter and less powerful engines

Question 28

Technician A says PVE refrigerant oil is commonly recommended for electric A/C compressors. Technician B says PAG refrigerant oil can be used in many electric A/C compressors. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 29

Technician A says hybrid vehicles use electrically driven high voltage A/C compressors. Technician B says hybrid vehicles use engine driven A/C compressors. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 30

Technician A says a mild hybrid has stop-start, regenerative braking, and electric motor assist available when the engine needs added power to overcome the load. Technician B says a full hybrid has stop-start, regenerative braking, electric motor assist, and can be driven by only electricity. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 31

Technician A says hybrids have an electrohydraulic brake assist system. Technician B says hybrids have an engine vacuum assisted power brake system. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 32

After isolating the high-voltage system, what is the minimum time you should wait before beginning to work on or around the hybrid system?

A) 1 hour
B) 30 minutes
C) 10 minutes
D) 5 minutes

Question 33

When a Toyota hybrid is driving on electric power, if more torque is needed, _____ is activated to start the engine.

A) MG1
B) MG2
C) 12-volt DC starter
D) all answers are correct

Question 34

Which of the following is NOT a component of the Toyota hybrid transaxle?

A) motor/generators 1 and 2
B) multiple disc clutch
C) planetary gear set
D) differential assembly

Question 35

When working on a high-voltage system, it is best to keep anyone who is not part of the service away from you and the car by creating a buffer zone around the car. Technician A makes sure the outside edges of the zone are at least one foot away from the car. Technician B places orange cones to define the outer boundaries of the zone. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 36

Technician A says an insulation resistance tester measures voltage. Technician B says an insulation resistance tester measures the effectiveness of a wire's insulation. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 37

In a hybrid vehicle the ___________________ changes the high DC voltage of the battery to a high AC voltage for the electric motors.

Question 38

While discussing working on hybrid vehicles: Technician A says to make sure that the high-voltage system is shut down and isolated from the vehicle before working near or with any high-voltage component. Technician B says that when working on or near the high-voltage system, even when it is de-powered, always use insulated tools. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 39

"Input split" and "compound split" are two modes of operation in a _____type transmission.

A) conventional CVT [Honda]
B) dual-mode hybrid
C) hybrid electronic CVT [Toyota/Lexus]
D) conventional planetary

Question 40

Two technicians are discussing the operation of the Toyota hybrid transaxle. Technician A says that the vehicle is driven electrically by MG2 when the transmission selector is in reverse. Technician B says that whenever the car is powered by MG2, the engine may start if the battery SOC is low. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 41

The ________________system replaces the traditional starter and generator in a conventional vehicle and is connected to the engine's crankshaft by a drive belt.

Question 42

What is the difference between a full hybrid and an assist hybrid?

Question 43

List five commonsense rules that should be followed when working on a hybrid vehicle.

Question 44

Nearly all hybrids have less powerful engines than typical non-hybrids. What feature of a hybrid provides power to allow the engine to overcome heavy loads?

Question 45

What is the purpose of a typical inverter?

Question 46

_________ type hybrids and rely on power from both an electric motor and the engine.

Question 47

An ______________is a power converter that changes the high DC voltage of the battery to a three-phase AC voltage for the electric motors.

Question 48

What equipment is needed to safely test the high-voltage components of the hybrid vehicle electrical system?

Question 49

What are the main reasons that a mild hybrid consumes less fuel than a conventional vehicle?

Question 50

In a Toyota Prius, what members of the planetary gearset are connected to the motor/generators?

Question 51

What are the functions of the metal box that surrounds the high-voltage batteries in a hybrid vehicle?

Question 52

How often must insulated lineman's gloves be tested and recertified?

Question 53

On hybrids with a separate cooling system for the inverter and other electronics, what needs to happen if air is trapped in the cooling system?

Question 54

The Prius PHEV offers many advantages over the basic Prius, how is that possible?

Question 55

What is a plug-in hybrid?

Question 56

What are the four main components of a typical hybrid system?