313D Refrigeration Cycle Fundamentals Questions and Answers

Question 1

In a standard refrigeration cycle, what is the primary function of the compressor?

Accepted Answer

To increase the pressure and temperature of the refrigerant vapor.

Answer

To absorb heat from the indoor space.

Answer

To release heat to the outdoors.

Answer

To control the flow of refrigerant.

Question 2

A residential air conditioning system is running, but the indoor unit is not blowing cold air. A technician measures the refrigerant state at the outlet of the evaporator coil and finds it is a saturated mixture. What does this condition most likely indicate?

Accepted Answer

The metering device is allowing too much refrigerant into the evaporator.

Answer

The system is operating with proper superheat.

Answer

The system is low on refrigerant.

Answer

The condenser fan is malfunctioning.

Question 3

Which of the following describes the state of the refrigerant as it enters the metering device in a properly functioning air conditioning system?

Accepted Answer

High-pressure, warm liquid

Answer

Low-pressure, low-temperature liquid

Answer

High-pressure, high-temperature vapor

Answer

Low-pressure, superheated vapor

Question 4

What is the primary purpose of the subcooling process that occurs in the condenser?

Accepted Answer

To prevent flash gas from forming before the metering device.

Answer

To increase the pressure of the refrigerant vapor.

Answer

To ensure only vapor enters the compressor.

Answer

To absorb maximum heat in the evaporator.

Question 5

During the refrigeration cycle, where does the refrigerant absorb heat from the space being cooled, causing it to change from a liquid to a vapor?

Accepted Answer

In the evaporator

Answer

In the compressor

Answer

In the condenser

Answer

In the metering device

Question 6

What is the primary function of a metering device, such as a thermostatic expansion valve (TXV) or a fixed orifice, in a residential air conditioning system?

Accepted Answer

To create a large pressure drop in the refrigerant.

Answer

To filter contaminants from the refrigerant.

Answer

To increase the temperature of the liquid refrigerant.

Answer

To pump the refrigerant through the system.