The commonly used coolant in refrigerators is

If a truck can carry 10 to 16 boxed refrigerators, then what is the least number of refrigerators that 4 trucks can carry?

A

40

B

52

C

48

D

64

Refrigerants commonly used for domestic refrigerators are

A

Ethyl chloride or methyle chloride

B

Freon-12

C

Propane

D

NH₃ or CO₂

The evaporator used in household refrigerators is

A

Frosting evaporator

B

Non-frosting evaporator

C

Defrosting evaporator

D

None of these

Which of the following motors is usually used in household refrigerators?

A

D.C. shunt motor

B

D.C. series motor

C

Single phase induction motor (split phase start or induction run motor)

D

Reluctance motor

The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and

A

Carbon dioxide

B

Sulphur dioxide

C

Lithium bromide

D

R-12

Refrigerators keep food unspoiled because ---

A

at its low temperature, bacteria and moulds are inactive

B

at its low temperature, the germs are killed

C

at its low temperature, the germs are frozen

D

it sterilizes the food

In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be

A

High, of the order of 25°

B

As low as possible (3 to 11°C)

C

Zero

D

Any value

Frost formation on the evaporator tubes in the domestic refrigerators

A

Can be prevented by proper design

B

Decreased compressor power

C

Causes heat loss due to poor heat transfer

D

Is immaterial

Most of the domestic refrigerators work on the following refrigeration system

A

Vapour compression

B

Vapour absorption

C

Carnot cycle

D

Electrolux refrigerator

The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.

A

Refrigerant cooling

B

Evaporator

C

Condenser

D

Throttling

The commonly used coolant in refrigerators is

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