Aux 2 Unit 10 Quiz 5

Aux 2 Unit 10 Q5

1 / 8

How does the air cooler function in relation to the evaporator in a DX system?

B) The air cooler directs warm air over the evaporator coils where the refrigerant absorbs heat

C) The air cooler heats the refrigerant for the condenser

D) The air cooler compresses the refrigerant

A) The air cooler condenses the refrigerant

2 / 8

Which of the following components is NOT part of a typical Direct Expansion refrigeration system?

A) Evaporator

D) Cooling tower

B) Compressor

C) Expansion valve

3 / 8

What is the defining characteristic of a Direct Expansion (DX) refrigeration system in an air conditioning setup?

A) It uses a secondary fluid to transfer heat

D) It uses water as the primary cooling medium

C) It requires a separate heat exchanger for heat transfer

B) The refrigerant directly absorbs heat from the air and changes phase in the evaporator

4 / 8

What happens to the refrigerant as it flows through the evaporator in a DX system?

A) It changes from vapor to liquid

B) It remains in a vapor state

C) It absorbs heat and changes from a liquid to a vapor

D) It releases heat and solidifies

5 / 8

What state is the refrigerant in when it exits the evaporator of a DX system?

B) Low-pressure vapor

A) High-pressure vapor

C) High-pressure liquid

D) Low-pressure liquid

6 / 8

What is an advantage of using a DX refrigeration system for air conditioning?

B) Direct cooling with high efficiency and simple design

C) Needs a separate water chiller for cooling

A) Requires complex piping and multiple heat exchangers

D) Consumes more energy compared to other systems

7 / 8

What is the main function of the expansion valve in a DX system?

C) To transfer heat to the compressor

D) To condense the refrigerant

A) To compress the refrigerant

B) To control and reduce the pressure and temperature of the refrigerant before it enters the evaporator

8 / 8

What type of heat exchange occurs in the evaporator of a DX system?

D) Heat exchange with an intermediate fluid

B) Latent cooling only

A) Sensible cooling only

C) Both sensible and latent cooling

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