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 : 15
During humidification process, __________ increases.

Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity

Question No : 16
Condensing temperature in a refrigerator is the temperature

Of cooling medium
Of freezing zone
Of evaporator
At which refrigerant gas becomes liquid

Question No : 17
The coefficient of performance is the ratio of the refrigerant effect to the

Heat of compression
Work done by compressor
Enthalpy increase in compressor
All of the above

Question No : 18
In vapour compression cycle, the condition of refrigerant is very wet 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 : 19
If a gas is to be liquefied, its temperature must be

Increased to a value above its critical temperature
Reduced to a value below its critical temperature
Equal to critical temperature
None of the above

Question No : 20
The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature of air entering the cooling coil, td₂ = Dry bulb temperature of air leaving the cooling coil, and td₃ = Dry bulb temperature of the cooling coil)

(td₁ -td₃)/( td₂ -td₃)
(td₂ -td₃)/( td₁ -td₃)
(td₃ -td₁)/( td₂ -td₃)
(td₃ -td₂)/( td₁ -td₃)

Question No : 21
The sub-cooling in a refrigeration cycle

Does not alter C.O.P.
Increases C.O.P.
Decreases C.O.P.
None of these