Past Exam Questions

Question 1

What is the function of the refrigerant?

Answer 1

Liquid in the refrigerator that evaporates by drawing heat from within the cabinet , thus cooling the cabinet down

Question 2

What is the function of the condenser?

Answer 2

Converts the gaseous refrigerant to a liquid

Question 3

State the function of the transformer.

Answer 3

Increases the normal domestic voltage from 230 V to a much higher frequency

Question 4

State the function of the magnetron

Answer 4

Converts electric energy to microwave energy

Question 5

State the function of the turntable

Answer 5

Glass plate at base of microwave which rotates the food.

Question 6

Explain the role of the compressor
(Working principle)
(3)

Answer 6

The compressor is found at the base of the fridge

It contains the gas refrigerant isobutene

A motor or pump connected to the compressor forces the gas refrigerant into the condenser above

Question 7

Explain the role of the condenser
(Working Principle)
(3)

Answer 7

The condenser cools the gas refrigerant and condenses it into a liquid

It is then sent to the evaporator above

The cooling fins at the back of the refrigerator radiate or release heat generated during the process, keeping the condenser cool

Question 8

State the function of the evaporator

Answer 8

Converts refrigerant back into gas , drawing heat from inside the fridge and keeping food cold