Question 1

What happens when room temperature soda is poured into a glass of ice?

Accepted Answer

A)   The ice gets colder.
B)   The ice melts because it is giving up the "cold" to the soda.
C)   The ice melts because it is absorbing heat from the soda.
D)   The ice melts because the soda is colder than the ice.E) A) and B)
F) A) and C)

Question 2

Ice melts in iceboxes because ____.

Accepted Answer

A)   heat flows through the insulated walls
B)   heat enters when the door is opened
C)   heat enters when warm food is placed in the icebox
D)   All of the above.E) A) and B)
F) A) and C)

Question 3

Vapor is more dense than liquid and, as the liquid refrigerant boils, it has a tendency to sink.

Accepted Answer

A) True 
 B)False

Question 4

Match between columns
                        Premises: 80.5 psig
37 psig
68.5 psig
35.1 psig

Accepted Answer

The Answer of R-134a and R-502 and R-22 and R-12 is...

Question 5

Refrigeration can be described as ____.

Accepted Answer

A)   the process of making products cold
B)   the process of introducing heat to a location where it is not wanted
C)   the process of removing heat from a place where it is not wanted to a place where it makes little or no difference
D)   None of the above.E) All of the above
F) C) and D)

Question 6

The ____ relationship correlates the vapor pressure and the boiling point of water and is the basis for controlling the cooling system's temperatures.

Accepted Answer

A)   boiling/pressure
B)   temperature/pressure
C)   temperature/vapor
D)   boiling/vaporE) A) and B)
F) All of the above

Question 7

Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure?

Accepted Answer

A)   R-12.
B)   R-22.
C)   R-134a.
D)   R-502.E) B) and C)
F) B) and D)

Question 8

The halide leak detector should be used in well ventilated areas as the resulting blue or green flame indicates that phosgene gas is being produced.

Accepted Answer

A) True 
 B)False

Question 9

The law requires technicians to recover refrigerant from all refrigeration systems so that they ____.

Accepted Answer

A)   will not be released into the atmosphere
B)   may be used again
C)   may be reclaimed for future use
D)   All of the above.E) All of the above
F) A) and C)

Question 10

The temperature inside the refrigerator fresh food section should be about ____.

Accepted Answer

A)   25 ºF
B)   30 ºF
C)   35 ºF
D)   40 ºFE) All of the above
F) B) and D)

Question 11

Good ventilation is important when working around refrigeration equipment because modern refrigerants ____.

Accepted Answer

A)   are toxic and can poison you
B)   have an unpleasant odor
C)   are heavier than air and may displace the oxygen around you
D)   Both a and c.E) B) and D)
F) A) and C)

Question 12

Modern refrigerators have become state-of-the-art appliances and some models even include automatic beverage and ice dispensers, built in television screens and connections to the World Wide Web.

Accepted Answer

A) True 
 B)False

Question 13

High temperature refrigeration is that produced by ____.

Accepted Answer

A)   heat from a furnace
B)   an air-conditioning system
C)   the vegetable cooling system of a refrigerator
D)   the freezer section of a refrigeratorE) A) and D)
F) B) and D)

Question 14

The evaporator in a refrigeration system must be colder than the refrigerated space in order to absorb heat.

Accepted Answer

A) True 
 B)False

Question 15

When the refrigerant leaves the metering device, it is not 100% liquid. Why?

Accepted Answer

When the high-pressure subcool...

Question 16

Only liquid refrigerant should enter the metering device.

Accepted Answer

A) True 
 B)False

Question 17

The only location where the refrigerant vapor is superheated is in the evaporator.

Accepted Answer

A) True 
 B)False

Question 18

The compressor in a refrigeration system ____.

Accepted Answer

A)   raises the boiling point of the refrigerant
B)   pumps the refrigerant throughout the system
C)   Both a and b.
D)   None of the above.E) A) and B)
F) B) and C)

Exam 3: Refrigeration and Refrigerants

Vapor is more dense than liquid and, as the liquid refrigerant boils, it has a tendency to sink.

Correct Answer
verified

The compressor in a refrigeration system ____.

Correct Answer
verified

Only liquid refrigerant should enter the metering device.

Correct Answer
verified

High temperature refrigeration is that produced by ____.

Correct Answer
verified

What happens when room temperature soda is poured into a glass of ice?

Correct Answer
verified

Refrigeration can be described as ____.

Correct Answer
verified

Good ventilation is important when working around refrigeration equipment because modern refrigerants ____.

Correct Answer
verified

Ice melts in iceboxes because ____.

Correct Answer
verified

The halide leak detector should be used in well ventilated areas as the resulting blue or green flame indicates that phosgene gas is being produced.

Correct Answer
verified

When the refrigerant leaves the metering device, it is not 100% liquid. Why?

Correct Answer
verified
When the high-pressure subcool...
View Answer

The ____ relationship correlates the vapor pressure and the boiling point of water and is the basis for controlling the cooling system's temperatures.

Correct Answer
verified

The only location where the refrigerant vapor is superheated is in the evaporator.

Correct Answer
verified

Modern refrigerators have become state-of-the-art appliances and some models even include automatic beverage and ice dispensers, built in television screens and connections to the World Wide Web.

Correct Answer
verified

Using the pressure temperature chart below, match the refrigerant with its correct pressure at 40°F.

The evaporator in a refrigeration system must be colder than the refrigerated space in order to absorb heat.

Correct Answer
verified

The law requires technicians to recover refrigerant from all refrigeration systems so that they ____.

Correct Answer
verified

The temperature inside the refrigerator fresh food section should be about ____.

Correct Answer
verified

Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure?

Correct Answer
verified

Exam 3: Refrigeration and Refrigerants

Vapor is more dense than liquid and, as the liquid refrigerant boils, it has a tendency to sink.

Correct AnswerverifiedShow Answer

The compressor in a refrigeration system ____.

Correct AnswerverifiedShow Answer

Only liquid refrigerant should enter the metering device.

Correct AnswerverifiedShow Answer

High temperature refrigeration is that produced by ____.

Correct AnswerverifiedShow Answer

What happens when room temperature soda is poured into a glass of ice?

Correct AnswerverifiedShow Answer

Refrigeration can be described as ____.

Correct AnswerverifiedShow Answer

Good ventilation is important when working around refrigeration equipment because modern refrigerants ____.

Correct AnswerverifiedShow Answer

Ice melts in iceboxes because ____.

Correct AnswerverifiedShow Answer

The halide leak detector should be used in well ventilated areas as the resulting blue or green flame indicates that phosgene gas is being produced.

Correct AnswerverifiedShow Answer

When the refrigerant leaves the metering device, it is not 100% liquid. Why?

Correct AnswerverifiedWhen the high-pressure subcool...View AnswerShow Answer

The ____ relationship correlates the vapor pressure and the boiling point of water and is the basis for controlling the cooling system's temperatures.

Correct AnswerverifiedShow Answer

The only location where the refrigerant vapor is superheated is in the evaporator.

Correct AnswerverifiedShow Answer

Modern refrigerators have become state-of-the-art appliances and some models even include automatic beverage and ice dispensers, built in television screens and connections to the World Wide Web.

Correct AnswerverifiedShow Answer

Using the pressure temperature chart below, match the refrigerant with its correct pressure at 40°F.

The evaporator in a refrigeration system must be colder than the refrigerated space in order to absorb heat.

Correct AnswerverifiedShow Answer

The law requires technicians to recover refrigerant from all refrigeration systems so that they ____.

Correct AnswerverifiedShow Answer

The temperature inside the refrigerator fresh food section should be about ____.

Correct AnswerverifiedShow Answer

Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure?

Correct AnswerverifiedShow Answer

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When the high-pressure subcool...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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