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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The humidity ratio or specific humidity is the mass of water vapour present in

1 m3 of dry air
1 kg of dry air
1 kg of wet air
1 m3 of wet air

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Refrigeration and Air Conditioning
Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system

Ammonia vapours to weak solution
Weak solution to strong solution
Strong solution to weak solution
Strong solution to ammonia vapour

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Refrigeration and Air Conditioning
For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be

Anything
High
Equal
Small

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Refrigeration and Air Conditioning
The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

(T₁ - T₂)/T₁
T₁ / (T₂ - T₁)
(T₂ - T₁)/T₁
T₂/ (T₂ - T₁)

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Refrigeration and Air Conditioning
The capillary tube is not used in large capacity refrigeration systems because

Required pressure drop cannot be achieved
Capacity control is not possible
It is made of copper
Cost is too high

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Refrigeration and Air Conditioning
For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

Less than
None of these
Greater than
Equal to

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MORE MCQ ON Refrigeration and Air Conditioning

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