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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The boiling point of ________ is 10.5°C.

Carbon dioxide
Sulphur dioxide
Ammonia
R-12

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Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Gas liquefaction
Commercial refrigerators
Domestic refrigerators
Air conditioning

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Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

0.2
1.2
5
6

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Refrigeration and Air Conditioning
In a domestic vapour compression refrigerator, the refrigerant commonly used is

Ammonia
R-12
CO?
All of these

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Refrigeration and Air Conditioning
In aircraft, air refrigeration Cycle is used because of

Low temperature at high altitudes
Higher coefficient of performance
High heat transfer rate
Low weight per tonne of refrigeration

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Refrigeration and Air Conditioning
A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

2 kW
4 kW
3 kW
1 kW

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