Question 1

Which of the following is another type of low-ambient temperature head pressure control ?

Accepted Answer

A)   Air volume control using shutters and fan cycling.
B)   Programmed defrost timer.
C)   Timer and liquid line solenoid for automatic pump down.
D)   Compressor internal heat.E) A) and D)
F) B) and C)

Question 2

Defrost using internal heat is accomplished using ____.

Accepted Answer

A)   a sail switch
B)   electric heating elements
C)   hot gas from the compressor
D)   mullion heatersE) C) and D)
F) B) and C)

Question 3

Random defrost is accomplished ____.

Accepted Answer

A)   with a timer
B)   using a high pressure control
C)   using a low pressure control
D)   when the refrigeration system has enough reserve capacity to cool more than the load requirementE) B) and C)
F) None of the above

Question 4

The crankcase pressure regulator (CPR) puts a limit on the pressure that can return to the compressor.

Accepted Answer

A) True 
 B)False

Question 5

Discuss the king valve .

Accepted Answer

The king valve is located in t...

Question 6

A suction line accumulator is used to ensure that liquid refrigerant enters the compressor.

Accepted Answer

A) True 
 B)False

Question 7

Where is the refrigerant filter drier found?

Accepted Answer

The refrigerant filt...

Question 8

What prevents the oil pressure safety control from de-energizing a compressor immediately after start-up?

Accepted Answer

There is a...

Question 9

The normal position for a suction service valve during normal operation is ____.

Accepted Answer

A)   back-seated
B)   front seated
C)   midseated
D)   Any of the three.E) All of the above
F) A) and C)

Question 10

When a system pumps down, where is the refrigerant stored?

Accepted Answer

A)   Condenser and receiver.
B)   Evaporator and compressor.
C)   Condenser and compressor.
D)   Both a and c.E) A) and B)
F) C) and D)

Question 11

List four causes of liquid floodback.

Accepted Answer

Wrong TXV setting (low or no compressor ...

Question 12

Two-temperature operation of a refrigeration system is necessary when ____.

Accepted Answer

A)   the compressor must be protected from overloading
B)   more than one evaporator is used with a compressor
C)   the coil in the evaporator is excessively long
D)   a multiple-circuit distributor is usedE) C) and D)
F) A) and B)

Question 13

To protect a refrigeration compressor when refrigerant loss occurs, a(n) ____________________ control is used.

Accepted Answer

low pressure

Question 14

Which of the following is a type of low-ambient temperature head pressure control ?

Accepted Answer

A)   CPR.
B)   EPR.
C)   Fan cycling.
D)   Off-cycle defrost.E) A) and B)
F) A) and C) C

Question 15

The spring-loaded type of relief valve is normally brass with a(n) ____________________ seat.

Accepted Answer

neoprene

Question 16

Refrigeration systems are designed to operate year round. For this reason they are equipped with ____.

Accepted Answer

A)   relief valves
B)   a low-ambient control
C)   oversized evaporator coils
D)   EEPR valvesE) None of the above
F) A) and B)

Question 17

How does the receiver ensure that only 100% liquid refrigerant enters the liquid line?

Accepted Answer

A)   By means of a dip tube.
B)   It only allows refrigerant to enter the liquid line when it is filled with liquid.
C)   The spring loaded relief valve opens.
D)   None of the above are correct.E) A) and B)
F) None of the above

Question 18

What is the temperature range in medium-temperature refrigeration?

Accepted Answer

The medium-temperature refrige...

Question 19

The EPR valve is installed in the suction line at the evaporator outlet and it ____.

Accepted Answer

A)   modulates the refrigerant vapor to the compressor
B)   prevents the boiling point in the evaporator from dropping below a pre-set point
C)   when used with a TX valve the system has the characteristics of maintaining a constant superheat and keeping the pressure from going too low
D)   All of the above.E) C) and D)
F) B) and D)

Question 20

Oil separators work on the principle of low refrigerant and oil velocity.

Accepted Answer

A) True 
 B)False

Exam 25: Special Refrigeration System Components

Which of the following is another type of low-ambient temperature head pressure control ?

Correct AnswerverifiedShow Answer

Defrost using internal heat is accomplished using ____.

Correct AnswerverifiedShow Answer

Random defrost is accomplished ____.

Correct AnswerverifiedShow Answer

The crankcase pressure regulator (CPR) puts a limit on the pressure that can return to the compressor.

Correct AnswerverifiedShow Answer

Discuss the king valve .

Correct AnswerverifiedThe king valve is located in t...View AnswerShow Answer

A suction line accumulator is used to ensure that liquid refrigerant enters the compressor.

Correct AnswerverifiedShow Answer

Where is the refrigerant filter drier found?

Correct AnswerverifiedThe refrigerant filt...View AnswerShow Answer

What prevents the oil pressure safety control from de-energizing a compressor immediately after start-up?

Correct AnswerverifiedThere is a...View AnswerShow Answer

The normal position for a suction service valve during normal operation is ____.

Correct AnswerverifiedShow Answer

When a system pumps down, where is the refrigerant stored?

Correct AnswerverifiedShow Answer

List four causes of liquid floodback.

Correct AnswerverifiedWrong TXV setting (low or no compressor ...View AnswerShow Answer

Two-temperature operation of a refrigeration system is necessary when ____.

Correct AnswerverifiedShow Answer

To protect a refrigeration compressor when refrigerant loss occurs, a(n) ____________________ control is used.

Correct Answerverifiedlow pressure

Which of the following is a type of low-ambient temperature head pressure control ?

Correct AnswerverifiedC

The spring-loaded type of relief valve is normally brass with a(n) ____________________ seat.

Correct Answerverifiedneoprene

Refrigeration systems are designed to operate year round. For this reason they are equipped with ____.

Correct AnswerverifiedShow Answer

How does the receiver ensure that only 100% liquid refrigerant enters the liquid line?

Correct AnswerverifiedShow Answer

What is the temperature range in medium-temperature refrigeration?

Correct AnswerverifiedThe medium-temperature refrige...View AnswerShow Answer

The EPR valve is installed in the suction line at the evaporator outlet and it ____.

Correct AnswerverifiedShow Answer

Oil separators work on the principle of low refrigerant and oil velocity.

Correct AnswerverifiedShow Answer

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The king valve is located in t...
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The refrigerant filt...
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There is a...
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Wrong TXV setting (low or no compressor ...
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low pressure

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C

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neoprene

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The medium-temperature refrige...
View Answer

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Correct Answer
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