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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The wet bulb temperature during sensible cooling of air

Increases
None of these
Remains constant
Decreases

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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?

1.25
0.8
0.25
0.5

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Refrigeration and Air Conditioning
Condensing temperature in a refrigerator is the temperature

At which refrigerant gas becomes liquid
Of evaporator
Of freezing zone
Of cooling medium

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Refrigeration and Air Conditioning
In vapour compression cycle the condition off refrigerant is dry saturated vapour

After passing through the condenser
Before passing through the condenser
Before entering the compressor
After passing through the expansion or throttle valve

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-10.5°C
-30°C
-77.7°C
-33.3°C

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Refrigeration and Air Conditioning
The condition of refrigerant after passing through the condenser in a vapour compression system is

Dry saturated vapour
Wet vapour
Superheated vapour
Saturated liquid

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