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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

decreases
increases
depends on other factors
remains same

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Refrigeration and Air Conditioning
In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively

Ammonia and water
Water and lithium bromide
Water and water
Ammonia and lithium bromide

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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
A human body feels comfortable when the heat produced by the metabolism of human body is equal to the

Sum of (A) and (B)
Difference of (A) and (B)
Heat dissipated to the surroundings
Heat stored in the human body

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Refrigeration and Air Conditioning
Rating of a domestic refrigerator is of the order of

40 tons
0.1 ton
10 tons
5 tons

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Refrigeration and Air Conditioning
In a reversed Brayton cycle, the heat is absorbed by the air during

Isentropic expansion process
Isentropic compression process
Constant pressure expansion process
Constant pressure cooling process

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MORE MCQ ON Refrigeration and Air Conditioning

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