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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The sub-cooling in a refrigeration cycle

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

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Refrigeration and Air Conditioning
Aqua ammonia is used as refrigerant in the following type of refrigeration system

Indirect
Compression
Absorption
Direct

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Refrigeration and Air Conditioning
In case of sensible cooling of air, the coil efficiency is given by

P.F. - 1
1 + B.P.F.
1 - B.P.F.
1/ B.P.F.

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Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

24 bars
Atmospheric pressure
Slightly above atmospheric pressure
56 bars

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

50 kJ/kg
125 kJ/kg
25 kJ/kg
100 kJ/kg

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Refrigeration and Air Conditioning
The vapour pressure of refrigerant should be

Lower than atmospheric pressure
Equal to atmospheric pressure
Higher than atmospheric pressure
Could be anything

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MORE MCQ ON Refrigeration and Air Conditioning

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