Deck 35: Heating and Air Conditioning Fundamentals

Question 1

5)When pressure in an air-conditioning system rises too high, the low-pressure cutout switch will open the circuit to the magnetic clutch.

Answer 1

False

Question 2

12)All of the following statements are true EXCEPT:

A) from the compressor, the refrigerant is pumped through the discharge line to the condenser, located in front of  the engine's radiator.
B) the condenser is a radiator for refrigerant.
C) the refrigerant's boiling temperature becomes lower when it is pressurized.
D) cooling the pressurized refrigerant in the condenser causes it to change from a gas to a slightly cooled but still warm liquid.

Answer 2

C

Question 3

15)All of the following statements are true EXCEPT:

A) the sunload sensor is located in the defroster outlet grille or on the dash.
B) the sunload sensor reacts to incandescent light or sunlight but not to fluorescent light.
C) the discharge duct temperature sensor is an NCT that provides the control module with the temperature of the air leaving the duct.
D) an interior temperature sensor is usually mounted in the defroster.

Answer 3

D

Question 4

16)____________________ is the process in which air inside of the passenger compartment is cooled, dried, and circulated.

Question 5

7)While having a discussion, Technician A says that heat is transferred by radiation. Technician B says that heat is transferred by evaporation. Who is correct?

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

Question 6

4)A saturated vapor is a liquid that is in contact with its vapor within an enclosed space.

Question 7

9)The boiling point of water is ____ at sea level.

A) 112⁰F
B) 180⁰F
C) 212⁰F
D) 232⁰F

Question 8

11)While having a discussion, Technician A says a typical GM vehicle air conditioner is rated at about 5,000 Btu. Technician B says that it is rated at about 10,000 Btu. Who is correct?

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

Question 9

6)Which of the following is LEAST-Likely to cause heat transfer?

A) Convection
B) Radiation
C) Evaporation
D) Humidity

Question 10

20)The outside air temperature (OAT) sensor, sometimes called a(n) ____________________ , is usually located in front of the condenser in the grille, where it is not affected by engine temperature.

Question 11

18)When moisture from steam condenses on a cool bathroom mirror, a vapor changes to a liquid. This is called ____________________.

Question 12

8)Before matter can actually change its state, extra heat is required. This additional heat is called ____.

A) radiation
B) sensible heat
C) solid heat
D) latent heat

Question 13

3)The amount of energy it takes to raise water's temperature from freezing to boiling is much more than the amount of latent heat of vaporization (the amount of heat needed to make the water boil).

Question 14

10)Which of the following is LEAST-Likely to be one of the major devices of an air conditioning system in a closed system?

A) Compressor
B) Convector
C) Condenser
D) Metering device

Question 15

1)An engine cooling system operating at the correct temperature with a properly operating thermostat is necessary for the heater to be effective.

Question 16

13)The term MOST-Likely used to refer to temperatures that are above a liquid's boiling point is:

A) radiation
B) superheat
C) desiccant
D) latent heat

Question 17

2)Low humidity (dry air) permits heat to be taken away from the human body by evaporation of perspiration.

Question 18

19)A receiver/dryer is located on the ____________________ of the system, whereas an accumulator is located on the low side.

Question 19

14)The part that is MOST-Likely to have multiple cylinders with pistons and one eccentric crankshaft throw called a Scotch yoke is the:

A) radial compressor
B) scroll compressor
C) displacement compressor
D) wobble plate

Question 20

17)Heat that goes into matter and results in a temperature increase is called ____________________.

Question 21

25)What is the purpose of an ambient temperature switch and a low pressure cutout switch?

Question 22

21)What are the two principles of convection?

Question 23

23)Why do some air-conditioning systems have a muffler installed on the outlet of the compressor?

Question 24

22)What is the purpose of the flow control device, sometimes called a thermostatic expansion valve (TXV), or a thermal expansion valve?

Question 25

24)What are the two basic functions that a receiver/dryer and an accumulator share?