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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.

None of these
Lower
Same
Higher

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

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

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Refrigeration and Air Conditioning
A refrigerant with the highest critical pressure is

R-22
R-11
Ammonia
R-12

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Refrigeration and Air Conditioning
The heat rejection factor (HRF) is given by

1 - C.O.P.
1 + C.O.P
1 - (1/C.O.P)
1 + (1/C.O.P)

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Lead
Rubber
Iron
Aluminium

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Refrigeration and Air Conditioning
In a psychrometric chart, specific humidity (moisture content) lines are

Horizontal and uniformly spaced
Vertical and uniformly spaced
Horizontal and non-uniformly spaced
Curved lines

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