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Refrigeration and Air Conditioning

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
0.25
0.5
1.25

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Refrigeration and Air Conditioning
In a refrigeration system, the expansion device is connected between the

Evaporator and compressor
Compressor and condenser
Receiver and evaporator
Condenser and receiver

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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
For obtaining high COP, the pressure range of compressor should be

High
Low
Optimum
Any value

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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 humidified
Cooled and dehumidified
Heated and dehumidified

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Refrigeration and Air Conditioning
When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

None of the listed here
Zero
Negative
Positive

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