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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.

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Question No : 50
The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as

Mean radiant temperature
Effective temperature
Dew point temperature
None of these
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Question No : 51
Which of the following refrigerant has the highest freezing point.

Ammonia
Carbon dioxide
Sulphur dioxide
R-12
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Question No : 52
Which of the following refrigerant has the lowest freezing point?

R-11
R-12
R-22
Ammonia
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Question No : 53
The moisture in a refrigerant is removed by

Evaporator
Safety relief valve
Dehumidifier
Driers
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Question No : 54
The evaporator changes the low pressure liquid refrigerant from the expansion valve into

High pressure liquid refrigerant
Low pressure liquid and vapour refrigerant
Low pressure vapour refrigerant
None of these
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Question No : 55
The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

(C.O.P.)P = (C.O.P.)R + 2
(C.O.P.)P = (C.O.P.)R + 1
(C.O.P)P = (C.O.P)R - 1
(C.O.P)P = (C.O.P)R
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Question No : 56
Presence of moisture in a refrigerant affects the working of

Compressor
Condenser
Evaporator
Expansion valve
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