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Modern Diesel Technology Heating, Ventilation, Air Conditioning & Refrigeration

John Dixon

Chapter 5

Air-Conditioning Components: Metering Devices, Evaporator, Accumulator - all with Video Answers

Educators

Chapter Questions

Problem 1

When refrigerant is metered into a properly working evaporator, the refrigerant:
A. Becomes superheated
C. Changes states into a vapor
B. Absorbs heat
D. All of the above

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Problem 2

Technician A states that the condenser gives up heat to the ambient air. Technician B states that the boiling refrigerant in the evaporator absorbs heat. Which technician is correct?
A. Technician A is correct.
C. Both Technicians A and B are correct.
B. Technician B is correct.
D. Neither Technician A nor B is correct.

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Problem 3

Two technicians are discussing the state of refrigerant as it enters the evaporator. Technician A says it is in a liquid state with a trace of flash gas. Technician B says that flash gas is caused by the decrease in refrigerant pressure as it passes through the metering device. Which technician is correct?
A. Technician A is correct.
C. Both Technicians A and B are correct.
B. Technician B is correct.
D. Neither Technician A nor B is correct.

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Problem 4

What situation would be considered most harmful to a TXV system?
A. Flooding of the evaporator, because the refrigerant will not vaporize due to the lack of space for expansion.
B. Flooding of the evaporator, allowing liquid refrigerant to return and damage the compressor.
C. Starving of the evaporator, which will drastically affect cooling efficiency.
D. Starving of the evaporator, creating too much superheat, which could damage the compressor.

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Problem 5

Which of the following statements is not true?
A. The accumulator is located in the
C. The evaporator is considered to be in the low-pressure suction line between the evaporator outlet and the compressor inlet. side of the air-conditioning system.
D. All fixed orifice tubes are identical.
B. The receiver-drier is located in the liquid line between the condenser outlet and the inlet of the TXV.

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Problem 6

In order for refrigerant to change states, there must be a transfer of heat. Technician A states that if heat is removed from refrigerant, it will change states from a liquid to a vapor. Technician B states that if heat is added to refrigerant, it will change from a liquid to a vapor. Which technician is correct?
A. Technician A is correct.
C. Both Technicians A and B are correct.
B. Technician B is correct.
D. Neither Technician A nor B is correct.

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Problem 7

Technician A states that the purpose of the pickup tube in a receiver-drier is to ensure liquid refrigerant is available to the TXV. Technician B says that the pickup tube in the accumulator is to prevent liquid refrigerant from returning to the compressor. Which technician is correct?
A. Technician A is correct.
C. Both Technicians A and B are correct.
B. Technician B is correct.
D. Neither Technician A nor B is correct.

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Problem 8

Technician A states that the accumulator assembly should be replaced any time major repairs are made to the air-conditioning system. Technician B says that the desiccant must be suitable for the type of refrigerant used within the air-conditioning system. Which technician is correct?
A. Technician A is correct.
C. Both Technicians A and B are correct.
B. Technician B is correct.
D. Neither Technician A nor B is correct.

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Problem 9

To what is the TXV remote bulb fastened?
A. The condenser outlet pipe
C. The evaporator inlet pipe
B. The condenser inlet pipe
D. The evaporator outlet pipe

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Problem 10

Two technicians are discussing the purpose of the orifice tube and the thermostatic expansion valve. Technician A says that the FOT meters a fixed quantity of refrigerant into the evaporator. Technician B says that the TXV meters a fixed quantity of refrigerant into the evaporator. Which technician is correct?
A. Technician A is correct.
C. Both Technicians A and B are correct.
B. Technician B is correct.
D. Neither Technician A nor B is correct.

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