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Refrigeration and Air Conditioning

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

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

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Refrigeration and Air Conditioning
During heating and humidification, the final relative humidity of air

Is higher than that of the entering air
Can be lower or higher than that of the entering air
Is lower than that of the entering air
None of the listed here

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Refrigeration and Air Conditioning
Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

0.25
0.8
0.5
1.25

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Refrigeration and Air Conditioning
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

5.12
2.15
1.25
1

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Refrigeration and Air Conditioning
The dry bulb temperature lines, on the psychrometric chart are

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

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

R-12
R-11
R-22
Ammonia

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