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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?

0.25
0.5
0.8
1.25

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

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

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Refrigeration and Air Conditioning
The operating temperature of a cold storage is -2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

18.6 kW
3.72 kW
7.44 kW
1.86 kW

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Refrigeration and Air Conditioning
The evaporator used in household refrigerators is

Non-frosting evaporator
Defrosting evaporator
None of these
Frosting evaporator

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Refrigeration and Air Conditioning
Hydrogen is used in Electrolux refrigeration system so as to _________ the rate of evaporation of the liquid ammonia passing through the evaporator.

Increase
Equalize
Reduce
None of these

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Refrigeration and Air Conditioning
The leakage in a refrigeration system using Freon is detected by

Halide torch
Sulphur sticks
Soap and water
All of these

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