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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In a refrigeration cycle, the flow of refrigerant is controlled by

Evaporator
Compressor
Expansion valve
Condenser

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Refrigeration and Air Conditioning
The dry bulb temperature during sensible heating of air

None of these
Increases
Remains constant
Decreases

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Refrigeration and Air Conditioning
Which of the following refrigerant has the lowest freezing point?

R-12
R-22
Ammonia
R-11

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Refrigeration and Air Conditioning
The operating pressure for refrigerating units using R-12 as a refrigerant is

2 bar
15 bar
8 bar
30 bar

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

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

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

Lower
Higher
None of these
Same

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