Refrigeration & Air-Conditioning MCQ Question with Answer

Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 43
The leaks in a refrigeration system using Freon are detected by

Halide torch which on detection produces greenish flame lighting

Sulphur sticks which on detection gives white smoke

Using reagents

Smelling

Question No : 44
In mechanical refrigeration system, the refrigerant has the maximum temperature

In evaporator

Before expansion valve

Between compressor and condenser

Between condenser and evaporator

Question No : 45
The lowest thermal diffusivity is of

Iron

Lead

Aluminium

Rubber

Question No : 46
Which of the following refrigerants has lowest freezing point?

Freon-12

NH3

CO2

Freon-22

Question No : 47
The refrigerant for a refrigerator should have

High sensible heat

High total heat

High latent heat

Low latent heat

Question No : 48
In vapour compression cycle the condition off refrigerant is dry saturated vapour

After passing through the condenser

Before passing through the condenser

After passing through the expansion or throttle valve

Before entering the compressor

Question No : 49
The domestic refrigerator uses following type of compressor

Centrifugal

Axial

Miniature sealed unit

Piston type reciprocating