FREE 313D Refrigeration Cycle Fundamentals Questions and Answers

Question 1

In a standard residential air conditioning system, what is the primary function of the evaporator coil?

Accepted Answer

To absorb heat from the indoor air, causing the refrigerant to boil.

Answer

To compress low-pressure refrigerant gas into a high-pressure gas.

Answer

To reject heat from the refrigerant to the outdoor air.

Answer

To reduce the pressure of the high-pressure liquid refrigerant.

Question 2

A technician measures the refrigerant leaving the condenser and finds it is a high-pressure liquid at a temperature below its saturation point. What is this condition called?

Accepted Answer

Subcooling

Answer

Superheat

Answer

Flashing

Answer

Saturation

Question 3

Which of the following components is responsible for creating a pressure differential that allows the refrigerant to change from a high-pressure liquid to a low-pressure liquid?

Accepted Answer

Metering Device

Answer

Compressor

Answer

Condenser

Answer

Evaporator

Question 4

A residential AC system is running, and the compressor is functioning correctly. What is the expected state of the refrigerant as it enters the compressor?

Accepted Answer

Low-pressure, superheated vapor

Answer

High-pressure, superheated vapor

Answer

Low-pressure, subcooled liquid

Answer

High-pressure, saturated liquid/vapor mix

Question 5

While diagnosing a system, a technician observes a very high superheat reading at the evaporator outlet. Which of the following is a potential cause?

Accepted Answer

Restricted liquid line filter drier

Answer

Refrigerant overcharge

Answer

Dirty condenser coil

Answer

Non-condensables in the system

Question 6

What is the primary purpose of adding superheat to the refrigerant vapor before it leaves the evaporator?

Accepted Answer

To ensure only vapor enters the compressor, preventing damage.

Answer

To increase the cooling capacity of the system.

Answer

To lower the pressure of the refrigerant before condensation.

Answer

To increase the efficiency of the condenser coil.