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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is

Reciprocating
Centrifugal
Screw
Rotating

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-86.6°C
-135.8°C
-107.7°C
-95.2°C

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Refrigeration and Air Conditioning
Which of the following refrigerant has the maximum ozone depletion potential in the stratosphere?

Ammonia
Fluorine
Sulphur dioxide
Carbon dioxide

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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

1.86 kW
3.72 kW
7.44 kW
18.6 kW

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

Remains constant
Decreases
Increases
None of these

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Refrigeration and Air Conditioning
For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be

High
Small
Equal
Anything

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