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Use Charging, Evacuation and Measuring Tools > Chapter 11 - Basic Cycle Quiz > Flashcards

Chapter 11 - Basic Cycle Quiz Flashcards

1
Q

Which refrigeration system component absorbs heat from where it is unwanted?

Compressor

Condenser

Evaporator

Liquid line

A

evaporator

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2
Q

The normal amount of superheat at the evaporator outlet is ____ degrees Fahrenheit.

0

10

45

80

A

10

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3
Q

Refrigerant inside the evaporator tubing is in which of the following saturated condition?

Low-temperature, low-pressure

Low-temperature, high-pressure

High-temperature, low-pressure

High-temperature, high-pressure

A

low temperature, low pressure

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4
Q

Which component of the refrigerant system connects the evaporator outlet to the compressor intake?

Hot-gas discharge line

Liquid line

Condensing line

Suction line

A

suction line

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5
Q

The condenser is a heat exchanger, which is designed to ____ heat.

absorb

add

release

soak up

A

release

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6
Q

Evaporators operate on the principles of conduction and ____.

convection

dissipation

radiation

thermodynamics

A

convection

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7
Q

Which of the following types of evaporators is commonly used in chest-type domestic freezers?

Plate-type

Shelf-type

Shell-type

Wall-type

A

wall-type

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8
Q

Which of the following types of evaporators is the most widely used in domestic, commercial, and industrial applications?

Finned-tube-type

Plate-type

Shell-type

Wall-type

A

finned-tube-type

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9
Q

Which of the following is not one of the three basic types of compressors?

Closed

Hermetic

Open

Semihermetic

A

closed

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10
Q

To achieve proper condenser operation, the compressor must increase the refrigerant pressure to a saturation temperature ____ degrees Fahrenheit higher than the ambient air entering the condenser.

1 to 5

8 to 15

30 to 35

75 to 80

A

30 to 50

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11
Q

All of the following are the types of air-cooled condensers commonly used in domestic refrigeration, except for which one?

Finned-tube

Plate-type

Wall static

Wire static

A

plate type

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12
Q

For commercial application, the ____ convection condenser is generally preferred.

forced

natural

normal

standard

A

forced

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13
Q

Makeup water is necessary, because cooling towers evaporate about ____ gallons of water every hour for each ton of refrigeration.

0.5

2

5

10

A

2

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14
Q

A refrigeration system is turned on when the rising air temperature reaches the ____ point of the air-sensitive thermostat.

cut-in

cut-out

pressure drop

safety relief

A

cut-in

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15
Q

The mail objective of the condenser operation is to have all refrigerant in ____ form in the final pass of the condenser tubing.

gas

liquid

solid

vapor

A

liquid

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16
Q

Suctions lines are insulated for the following reasons, except to ____.

limit superheating of suction line gas

prevent condensation and frost on the suction line

prevent reduced compressor efficiency

short-cycle the system

A

short-cycle the system

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17
Q

The evaporator temperature difference only exists when the system is in the on cycle.
True
False

A

true

18
Q

In the basic refrigeration cycle, the circulating refrigerant absorbs unwanted heat at one location and carries it to another location where it will be released.

True
False
A

true

19
Q

When the temperature of the incoming air reaches the desired lower temperature level, the thermostat turns off the evaporator fan.

True
False
A

false

20
Q

The refrigerant being discharged by the compressor is in the form of a low-pressure, low-temperature gas.

True
False
A

false

21
Q

The condenser is designed to absorb heat.

True
False
A

false

22
Q

The shell-type evaporator was commonly used as the freezing compartment in domestic refrigerators that had automatic defrost.

True
False
A

false

23
Q

A very long suction line or one with many bends or fittings will lead to a pressure increase.

True
False
A

false

24
Q

The compressor is the “heart” of the refrigeration system.

True
False
A

true

25
Q

Water-cooled condensers are less efficient than air-cooled condensers.

True
False
A

false

26
Q

The wall static condenser is efficient, hidden from view, and space-saving.

True
False
A

true

27
Q

Water-cooled condensers are the most commonly used type of condenser in commercial systems.

True
False
A

false

28
Q

The water-regulating valve is designed to control head pressure by governing the flow of cooling water to the condenser.

True
False
A

true

29
Q

The heat-exchanging device located inside the area where the heat is to be removed is called the

A

evaporator

30
Q

Convention can be ______________________________ or forced.

A

natural

31
Q

The gas-carrying capacity of a(n) ______________________________ line is closely calculated to match the flow of gas from the evaporator to the compressor.

A

suction

32
Q

The two types of natural convection domestic refrigeration condensers are the wire static and the ______________________________ static.

A

wall

33
Q

The tube-in-a-tube condenser applies the ______________________________ principle for maximum efficiency.

A

counter-flow

34
Q

The purpose of a(n) ______________________________ tower is to lower the temperature of the water leaving a water-cooled condenser so the water can be recirculated through the condenser for further cooling.

A

cooling

35
Q

Connects the condenser outlet to the refrigerant metering device

A

liquid line

36
Q

Connects the evaporator outlet to the compressor intake

A

metering device

37
Q

Copper tubing allowing discharged hot gas to travel to condenser

A

hot gas discharge line

38
Q

Controls flow of liquid refrigerant into the evaporator

A

metering device

39
Q

Heat-exchanging device which releases heat

A

condenser

40
Q

Pump low-pressure vapor into the high side of the system

A

compressor

41
Q

Heat-exchanging device which absorbs heat

A

evaporator

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