Question 1

AXVs are usually found on smaller equipment with somewhat constant evaporator loads .

Accepted Answer

A) True 
 B)False

Question 2

The pressure-limiting TXV ____.

Accepted Answer

A)   allows the compressor to operate at low condenser entering air temperatures
B)   shuts off the condenser fan during hot pull down
C)   maintains the full refrigerant flow rate during a hot pulldown
D)   keeps the suction pressure to the compressor down during a hot pulldownE) A) and B)
F) All of the above

Question 3

If the thermal bulb assembly develops a leak, what will occur?

Accepted Answer

A)   All of the system's refrigerant will leak out.
B)   The bulb pressure will reduce and the valve will close.
C)   The valve will open to allow more refrigerant to flow.
D)   It will have no effect on system operation.E) A) and B)
F) A) and C)

Question 4

Explain why the external equalizer line on a thermostatic expansion valve should always be installed after (downstream of) the thermal bulb.

Accepted Answer

To prevent superheat problems from inter...

Question 5

The pressure-limiting TXV is desirable in low temperature applications because it keeps the suction pressure to the compressor down during hot pulldowns .

Accepted Answer

A) True 
 B)False

Question 6

The following is a function of an expansion device:  ____.

Accepted Answer

A)   produce a reduction in the pressure on the liquid refrigerant
B)   regulate the flow of refrigerant into the evaporator
C)   lower the boiling point of the refrigerant far enough below the temperature of the load to get the needed heat transfer rate
D)   All of the above.E) A) and B)
F) A) and C)

Question 7

The automatic expansion valve maintains a constant ____________________ in the evaporator .

Accepted Answer

The answer of The automatic expansion valve maintains a constant...

Question 8

The pin or valve port piston of the electronic step-motor expansion valve can move in a linear motion of 0.0000783 in./step .

Accepted Answer

A) True 
 B)False

Question 9

A thermostatic expansion valve meters refrigerant flow to the evaporator based on the ____.

Accepted Answer

A)   rate of liquid vaporization
B)   evaporator suction line superheat
C)   external equalizer pressure
D)   All of the above.E) All of the above
F) C) and D)

Exam 24: Expansion Devices

Explain why the external equalizer line on a thermostatic expansion valve should always be installed after (downstream of) the thermal bulb.

Correct Answer
verified
To prevent superheat problems from inter...
View Answer

The following is a function of an expansion device: ____.

Correct Answer
verified

If the thermal bulb assembly develops a leak, what will occur?

Correct Answer
verified

The pin or valve port piston of the electronic step-motor expansion valve can move in a linear motion of 0.0000783 in./step .

Correct Answer
verified

AXVs are usually found on smaller equipment with somewhat constant evaporator loads .

Correct Answer
verified

The automatic expansion valve maintains a constant ____________________ in the evaporator .

Correct Answer
verified

The pressure-limiting TXV ____.

Correct Answer
verified

The pressure-limiting TXV is desirable in low temperature applications because it keeps the suction pressure to the compressor down during hot pulldowns .

Correct Answer
verified

A thermostatic expansion valve meters refrigerant flow to the evaporator based on the ____.

Correct Answer
verified

Exam 24: Expansion Devices

Explain why the external equalizer line on a thermostatic expansion valve should always be installed after (downstream of) the thermal bulb.

Correct AnswerverifiedTo prevent superheat problems from inter...View AnswerShow Answer

The following is a function of an expansion device: ____.

Correct AnswerverifiedShow Answer

If the thermal bulb assembly develops a leak, what will occur?

Correct AnswerverifiedShow Answer

The pin or valve port piston of the electronic step-motor expansion valve can move in a linear motion of 0.0000783 in./step .

Correct AnswerverifiedShow Answer

AXVs are usually found on smaller equipment with somewhat constant evaporator loads .

Correct AnswerverifiedShow Answer

The automatic expansion valve maintains a constant ____________________ in the evaporator .

Correct AnswerverifiedShow Answer

The pressure-limiting TXV ____.

Correct AnswerverifiedShow Answer

The pressure-limiting TXV is desirable in low temperature applications because it keeps the suction pressure to the compressor down during hot pulldowns .

Correct AnswerverifiedShow Answer

A thermostatic expansion valve meters refrigerant flow to the evaporator based on the ____.

Correct AnswerverifiedShow Answer

Correct Answer
verified
To prevent superheat problems from inter...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified