Deck 2: The Refrigeration Process

Question 1

The sensing bulb on a TEV is located at which part of the refrigeration system?

A) outlet of the evaporator
B) inlet of the evaporator
C) inlet of the condenser
D) outlet of the condenser

Answer 1

A

Question 2

The basic air conditioning system is made up of which four components?

A) compressor, condenser, evaporator, receiver
B) compressor, accumulator, evaporator, metering device
C) compressor, condenser, evaporator, metering device
D) condenser, evaporator, metering device, filter drier

Answer 2

C

Question 3

Which refrigerant used in residential air conditioning has operating pressures that are about 40% to 70% higher than that of R-22?

A) R-22
B) R-410A
C) R-134a
D) R-12

Answer 3

B

Question 4

An evaporator can also dehumidify the air in a building.

Question 5

Which component in a refrigeration system performs the actual cooling or refrigeration?

A) compressor
B) evaporator
C) condenser
D) metering device

Question 6

Refrigerant can exist as both a liquid and vapor simultaneously.

Question 7

Which component in a refrigeration system is responsible for raising the pressure and temperature of the vapor refrigerant that leaves the evaporator?

A) compressor
B) evaporator
C) condenser
D) metering device

Question 8

Which component in a refrigeration system is responsible for reducing the pressure in the system?

A) compressor
B) evaporator
C) condenser
D) metering device

Question 9

The refrigeration process can best be described as the transferring of heat from an objectionable location to a place where the addition of this heat has __________ on the surrounding conditions.

A) great effect
B) little or no effect
C) moderate effect
D) synthetic effect

Question 10

Higher efficiency condensers can operate with saturation temperatures as low as ____ degrees F higher than the ambient air.

A) 10
B) 20
C) 30
D) 40

Question 11

The refrigerant is pumped from the compressor to which component?

A) condenser
B) evaporator
C) filter drier
D) metering device

Question 12

It is possible for a refrigerant to absorb heat at a low temperature and reject heat at a higher temperature.

Question 13

As the pressure of a saturated refrigerant increases, its temperature decreases.

Question 14

Which type of compressor can be identified by its cylindrical shape and the fact that the discharge line is located in the center at the very top of the compressor?

A) reciprocating
B) rotary
C) screw
D) scroll

Question 15

Although it is no longer used in the manufacturing of new air conditioning systems, the number of existing systems using __________ is large, so technicians will be encountering this refrigerant for many years to come.

A) R-22
B) R-12
C) R-410A
D) R-134a

Question 16

Which type of compressor utilizes pistons, cylinders, and valves to accomplish the compression of the refrigerant?

A) reciprocating
B) rotary
C) screw
D) scroll

Question 17

Which two types of heat can an evaporator remove from the air?

A) radiant, conduction
B) sensible, radiant
C) latent, sensible
D) superheat, subcooling

Question 18

The amount of heat added to a substance after it has been vaporized is called ____.

A) subcooling
B) latent
C) superheat
D) radiant

Question 19

Which component in a refrigeration system rejects the heat from the system?

A) compressor
B) evaporator
C) condenser
D) metering device

Question 20

Which type of compressor is reliant on the production of two perfectly machined spirals?

A) reciprocating
B) rotary
C) screw
D) scroll

Question 21

The bubble point temperature represents the temperature at which the __________ will appear in high pressure, high temperature liquid refrigerant. The bubble point temperature is used to calculate and determine the condenser __________.

Question 22

The refrigerant enters the compressor from which component?

A) evaporator
B) condenser
C) liquid line filter drier
D) mertering device

Question 23

The dewpoint temperature represents the temperature at which the __________ will appear in the low pressure, low temperature vapor refrigerant. The dewpoint is used to calculate and determine evaporator __________.

Question 24

On a properly operating system, what is the state of the refrigerant as it enters the metering device?

A) high pressure vapor
B) low pressure vapor
C) high pressure liquid
D) low pressure liquid

Question 25

Saturated refrigerants follow a __________ relationship.

Question 26

List three types of metering devices used in refrigeration systems.

Question 27

__________ allow an air conditioning system to reject heat more effectively and efficiently.

Question 28

On a properly operating system, what is the state of the refrigerant as it leaves the evaporator?

A) high pressure vapor
B) low pressure vapor
C) high pressure liquid
D) low pressure liquid

Question 29

On a properly operating system, what is the state of the refrigerant as it enters the compressor?

A) high pressure vapor
B) low pressure vapor
C) low pressure liquid
D) high pressure liquid

Question 30

On a properly operating system, what is the state of the refrigerant as it enters the condenser?

A) high pressure vapor
B) low pressure vapor
C) low pressure liquid
D) high pressure liquid