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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The specific humidity during heating and humidification process.

Remains constant
Increases
Decreases
None of these

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Refrigeration and Air Conditioning
A standard ice point temperature corresponds to the temperature of

Water at 0°C
Ice at 4°C
Solid and dry ice
Mixture of ice and water under equilibrium conditions

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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

7.44 kW
3.72 kW
18.6 kW
1.86 kW

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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
0.5
0.8
0.25

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-10.5°C
-77.7°C
-30°C
-33.3°C

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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
1
2.15
1.25

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