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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

5
6
1.2
0.2

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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?

0.8
1.25
0.5
0.25

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Refrigeration and Air Conditioning
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

Steel
Aluminium
Copper
Brass

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

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

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Refrigeration and Air Conditioning
The undesirable property of a refrigerant is

High boiling point
Non-flammable
Non-toxic
Non-explosive

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Refrigeration and Air Conditioning
In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is

Heated and humidified
Cooled and dehumidified
Cooled and humidified
Heated and dehumidified

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