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Refrigeration Basics Quiz for Students

Total questions: 30

Worksheet time: 15mins

Name
Class
Date
1.

Which part of the refrigeration cycle is responsible for turning low-pressure vapour into high-pressure vapour?

a)

Condenser

b)

Compressor

c)

Expansion valve

d)

Filter drier

2.

What happens to the refrigerant as it passes through the condenser?

a)

It absorbs heat and turns into a gas

b)

It releases heat and turns into a liquid

c)

It mixes with oil

d)

It changes colour

3.

Which of these is an example of heat transfer by radiation?

a)

A spoon warming up in a hot drink

b)

The sun warming your face

c)

Water boiling in a kettle

d)

Air moving in a room

4.

Which refrigerant is often used in supermarket freezers in Great Britain?

a)

R404A

b)

R12

c)

R717

d)

R600a

5.

What is the main job of the expansion valve in a refrigeration system?

a)

To increase refrigerant temperature

b)

To control the flow of refrigerant into the evaporator

c)

To add oil to the system

d)

To remove air from the system

6.

Which of these is a safe practice when working with refrigeration systems?

a)

Using open flames near refrigerants

b)

Wearing gloves and goggles

c)

Ignoring warning labels

d)

Using any type of oil

7.

Which law explains why a balloon expands when heated?

a)

Boyle’s Law

b)

Charles’s Law

c)

Dalton’s Law

d)

Newton’s Law

8.

On a pressure-enthalpy chart, what does the horizontal line in the two-phase region represent?

a)

Constant temperature

b)

Changing colour

c)

Increasing pressure

d)

Decreasing oil content

9.

Which oil is suitable for use with ammonia (R717) refrigeration systems?

a)

Polyolester (POE) oil

b)

Mineral oil

c)

Alkylbenzene oil

d)

Synthetic oil

10.

What is the main function of the sight glass in a refrigeration system?

a)

To check refrigerant colour

b)

To observe refrigerant flow and moisture

c)

To add oil

d)

To measure temperature

11.

Which method of heat transfer is used when warm air rises and cool air sinks?

a)

Conduction

b)

Convection

c)

Radiation

d)

Absorption

12.

What does the filter drier remove from the refrigerant?

a)

Heat

b)

Moisture and dirt

c)

Oil

d)

Pressure

13.

Which regulation must be followed when disposing of refrigerants in Great Britain?

a)

Leave them in the open air

b)

Follow F-Gas regulations

c)

Pour them down the drain

d)

Burn them

14.

Which refrigerant is a natural hydrocarbon?

a)

R134a

b)

R290 (Propane)

c)

R404A

d)

R22

15.

What is the usual pressure unit for measuring suction pressure in a refrigeration system in Great Britain?

a)

psi

b)

bar

c)

pascal

d)

atm

16.

Which device is used to measure the temperature of air entering a refrigerator?

a)

Pressure gauge

b)

Thermometer

c)

Multimeter

d)

Sight glass

17.

What does a psychrometric chart help you find?

a)

The amount of water vapour in the air

b)

The speed of the compressor

c)

The colour of refrigerant

d)

The weight of oil

18.

Which of these could cause a refrigeration system to stop cooling?

a)

Too much oil

b)

Blocked filter drier

c)

Clean condenser

d)

Low humidity

19.

What is the freezing point of water in Celsius?

a)

0∘0^\circ C

b)

32∘32^\circ C

c)

100∘100^\circ C

d)

−18∘-18^\circ C

20.

Which law describes the relationship P1V1=P2V2P_1V_1 = P_2V_2 for a gas at constant temperature?

a)

Boyle’s Law

b)

Charles’s Law

c)

Dalton’s Law

d)

Newton’s Law

21.

If you see bubbles in the sight glass, what might this mean?

a)

The system is overcharged

b)

There is not enough refrigerant

c)

The oil is dirty

d)

The compressor is too cold

22.

Which refrigerant is used in many car air conditioning systems?

a)

R134a

b)

R717

c)

R404A

d)

R290

23.

Why is oil needed in a refrigeration compressor?

a)

To cool the refrigerant

b)

To lubricate moving parts

c)

To increase pressure

d)

To add colour

24.

Which of these is a good first step if a fridge is not cold enough?

a)

Check the door seal

b)

Add more refrigerant

c)

Change the oil

d)

Increase the temperature setting

25.

What is the normal temperature for a freezer in Great Britain?

a)

−18∘-18^\circ C

b)

0∘0^\circ C

c)

5∘5^\circ C

d)

10∘10^\circ C

26.

Which property makes a refrigerant suitable for use in low-temperature applications?

a)

High boiling point

b)

Low boiling point

c)

High viscosity

d)

High density

27.

What does “subcooling” mean in refrigeration?

a)

Cooling below 0∘0^\circ C

b)

Cooling a liquid refrigerant below its condensation temperature

c)

Heating the refrigerant

d)

Adding oil to the system

28.

Which of these is NOT a method of heat transfer?

a)

Conduction

b)

Convection

c)

Radiation

d)

Compression

29.

What is the main function of a liquid receiver in a refrigeration system?

a)

To store excess liquid refrigerant

b)

To add oil

c)

To increase pressure

d)

To cool the refrigerant

30.

On a psychrometric chart, what does the dew point line show?

a)

The temperature at which air becomes saturated with water vapour

b)

The speed of the compressor

c)

The colour of refrigerant

d)

The weight of oil

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