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Fundamentals of Refrigeration 2

Total questions: 16

Worksheet time: 8mins

Name
Class
Date
1.

Match the steps of the refrigeration cycle with where they occur:

a)

Evaporation coils

1.

Evaporation

b)

Suction gas

2.

Superheating

c)

Compressor cylinder

3.

Compression

d)

Upper condenser

4.

Cooling

e)

Lower condenser

5.

Condensing

2.

The purpose of the evaporator is to absorb heat from the surrounding medium into the ________ refrigerant.

a)

liquid

b)

gaseous

c)

solid

d)

frozen

3.

The reason for superheating the suction gas is to prevent its condensation back into a ________.

a)

liquid

b)

solid

c)

vapor

d)

gasoline

4.

The purpose of the compressor is: Which one is correct?

a)

To lower the gas pressure above the liquid

b)

To increase the pressure of the gas in the condenser to the point where sufficient heat will flow out of the gas.

5.

The reason for cooling the discharge gas is to remove the ________ and heat of compression.

a)

superheat

b)

condensate

c)

humidity

d)

frost

6.

The reason for condensing the gas is to remove the ________ heat absorbed in the evaporator and to return it to a liquid.

a)

latent

b)

sensible

c)

mechanical

d)

conductive

7.

The reason for subcooling the liquid is to remove as much heat as is practical from the liquid before returning it to the ________.

a)

evaporator

b)

compressor

c)

condenser

d)

expansion valve

8.

The purpose of the metering device is: Which one is correct?

a)

To separate the high pressure refrigerant from the low pressure

b)

To replace the liquid refrigerant in the evaporator as it boils away.

9.

Which of the following lists the seven steps of the refrigeration cycle in the correct order and location?

a)

Compression (Compressor), Condensation (Condenser), Expansion (Expansion Valve), Evaporation (Evaporator), Superheating (Evaporator), Subcooling (Condenser), Suction (Compressor)

b)

Evaporation (Compressor), Compression (Evaporator), Condensation (Expansion Valve), Expansion (Condenser), Superheating (Expansion Valve), Subcooling (Evaporator), Suction (Condenser)

c)

Compression (Evaporator), Condensation (Compressor), Expansion (Condenser), Evaporation (Expansion Valve), Superheating (Condenser), Subcooling (Expansion Valve), Suction (Evaporator)

d)

Condensation (Compressor), Compression (Condenser), Expansion (Evaporator), Evaporation (Expansion Valve), Superheating (Compressor), Subcooling (Evaporator), Suction (Condenser)

10.

The purpose of the compressor is:

a)

to increase the pressure of a gas

b)

to decrease the temperature of a gas

c)

to filter impurities from a gas

d)

to measure the flow of a gas

11.

The reason for cooling the discharge gas is:

a)

To increase pressure

b)

To reduce temperature and prevent damage

c)

To increase humidity

d)

To reduce flow rate

12.

The two purposes of the metering device are:

a)

To control refrigerant flow and reduce pressure

b)

To increase temperature and filter impurities

c)

To circulate air and provide lubrication

d)

To generate electricity and store energy

13.

The reason for superheating the suction gas is:

a)

To increase the pressure of the gas

b)

To prevent liquid refrigerant from entering the compressor

c)

To reduce the temperature of the gas

d)

To increase the humidity of the gas

14.

The purpose of the evaporator is:

a)

To absorb heat and allow the refrigerant to evaporate

b)

To compress the refrigerant

c)

To condense the refrigerant

d)

To filter the refrigerant

15.

The reason for condensing the discharge gas is:

a)

To increase the temperature

b)

To reduce the pressure

c)

To convert it into a liquid for easier handling

d)

To remove impurities

16.

Subcooling the liquid leaving the condenser is done to:

a)

Increase the pressure of the refrigerant

b)

Prevent flash gas formation before the expansion valve

c)

Reduce the temperature of the evaporator

d)

Increase compressor efficiency