Deck 26: Heating and Air Conditioning

Question 1

Three types of radiator fans used on modern engines are the belt-driven fan, the electric fan, and the mechanical fan.

Answer 1

False

Question 2

Because air trapped in the cooling system is a serious concern, many cooling systems are equipped with a (an) _________ __________ valve.

Answer 2

air bleed

Question 3

The __________ __________ may be controlled by a cable, a vacuum diaphragm, or an electric motor.

Answer 3

blend door

Question 4

The ___________ ___________ ___________ is used to trap dirt, dust, and other contaminants from entering the HVAC system and passenger compartment.

Question 5

A malfunctioning thermostat can cause poor heater performance.

Question 6

Which of the following is used to drop the pressure of the refrigerant before it enters the evaporator?

A)The expansion valve
B)The receiver/drier
C)The compressor
D)None of the above

Question 7

A thermostat that is stuck open will cause ________ engine operating temperature and ________ heater performance.

Question 8

A radiator cap is rated at one bar.This is equivalent to atmospheric pressure at _________.

A)1 psi
B)13 psi
C)14.7 psi
D)5 psi

Question 9

All of the following statements are true EXCEPT:

A)Refrigerant R-1234yf is flammable.
B)Refrigerant R-13a is flammable.
C)Contact with refrigerant vapor can cause frostbite.
D)Coolant cannot be drained into the shop drain system.

Question 10

R-134a and R-1234yf are compatible with each other.

Question 11

Water pumps are being discussed.Technician A says the water pump may be driven by the accessory belt.Technician B says the water pump may be driven by the timing belt.Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 12

All current factory coolants are ethylene glycol based.

Question 13

The heater core is part of the engine's ____________________ system.

Question 14

Which of the following statements is correct?

A)Refrigerant leaves the compressor as a high-pressure, high-temperature liquid
B)Refrigerant leaves the condenser as a low-pressure, high-temperature liquid
C)Refrigerant returns to the compressor as a low-pressure, high-temperature vapor
D)None of these answers is correct

Question 15

Many cooling systems use a surge or pressure tank, also called a (an) __________.

A)water pump
B)evaporator
C)receiver/dryer
D)degass bottle

Question 16

Most of the components of the ventilation system are _____.

A)in front of the radiator
B)between the right front inner fender and the firewall
C)below the condenser
D)hidden beneath the dash

Question 17

The ratio of coolant to water determines the freezing point of the coolant and affects the boiling point.

Question 18

Technician A says the accumulator is located on the high side of the refrigeration system.Technician B says the receiver/drier is located on the low side of the refrigeration system.Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 19

Which of the following statements is not correct?

A)The condenser is normally mounted in front of the radiator.
B)The receiver/dryer is a storage tank for liquid refrigerant from the condenser.
C)The evaporator is in the passenger compartment.
D)All answers are correct

Question 20

As the pressure in the radiator increases, the boiling point of the coolant also increases, about __________ for every pound of pressure.

A)3°F
B)6°F
C)15°F
D)10°F