6. What is the drawback to a parallel hybrid?
7. In a series/parallel hybrid, a(n) ______ ______ is
used to transfer engine power and electric motor
power through the drive train.
8. A(n) ______ hybrid can be connected to a 120-
volt outlet to fully recharge the battery pack.
9. List the five modes of hybrid operation.
10. During the hybrid all-electric drive mode, the
______-______ provides all the energy to propel
the vehicle.
11. An internal combustion engine is least efficient
when operating at a very low rpm. True or false?
12. During ______ braking, the motor-generator
places a drag on the rotating tires, wheels, and
drive train to help slow the vehicle.
13. A hybrid high-voltage system typically operates
on voltages that range from ______ to ______ volts.
14. The maximum voltage available from the HV
battery pack is called the hybrid ______ ______
voltage.
15. The hybrid battery pack sends voltage directly
to the motor-generator. True or False?
16. Hybrid battery packs contain several battery mod-
ules wired in ______ to produce a high voltage.
17. List four functions of a hybrid motor-generator.
18. The hybrid ______ ______ ______ contains a con-
verter circuit, an inverter circuit, and a motor-
generator ECU.
19. How many hybrid power cables connect the
power control module to the motor generator?
20. A hybrid ______ ______ ______ monitors the
system for high-voltage leaking into the metal
chassis of the vehicle.
21. List three methods used to cool hybrid drive
components.
22. Gas-electric hybrid drive systems generate
enough electrical energy to cause electrocution.
True or False?
23. A high-voltage ______ is used on a gas-electric
hybrid to produce an open circuit between the
power control module and the battery pack.
24. Hybrid vehicles often keep their battery pack
state of charge at ______%.
25. When replacing a hybrid power cable, a(n)
______ ______ should be used to tighten cable fas-
teners to specifications.
ASE-Type Questions
1. Manufacturers are experimenting with each of
the following hybrid types, except:
(A) pneumatic hybrids.
(B) hydraulic hybrids.
(C) fuel-cell hybrids.
(D) steam-powered hybrids.
2. Technician A says you can identify a hybrid
vehicle by the badging on the engine cover.
Technician B says you can identify a hybrid by
comparing the vehicle’s VIN to factory refer-
ence information. Who is right?
(A) A only.
(B) B only.
(C) Both A and B.
(D) Neither A nor B.
3. Technician A says all mild hybrids use a small
motor-generator to assist the gas engine during
acceleration. Technician B says a mild hybrid
shuts down its internal combustion engine when
the vehicle comes to a stop. Who is right?
(A) A only.
(B) B only.
(C) Both A and B.
(D) Neither A nor B.
4. In the all-electric drive mode, the energy needed
to power the motor-generator is provided by
the ______.
(A) internal combustion engine
(B) power splitter
(C) battery pack
(D) hybrid drive ECU
5. Hybrid system voltages are being discussed.
Technician A says that most hybrids have both
a high-voltage system and a low-voltage
system. Technician B says that all low-voltage
systems contain a 24-volt battery. Who is
right?
(A) A only.
(B) B only.
(C) Both A and B.
(D) Neither A nor B.
Chapter 38 Hybrid Drive System Operation and Repair 721