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Refrigeration and Air Conditioning

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

6
0.2
5
1.2

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Refrigeration and Air Conditioning
In a refrigerating machine, heat rejected is _________ heat absorbed.

Greater than
Equal to
None of these
Less than

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Refrigeration and Air Conditioning
The coefficient of performance of Heat Pump is always ___ one.

Less than
None of the listed here
Equal to
Greater than

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Refrigeration and Air Conditioning
Where does the lowest temperature occur in a vapour compression cycle?

Condenser
Expansion valve
Evaporator
Compressor

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Refrigeration and Air Conditioning
The capillary tube, as an expansion device, is used in

All of these
Domestic refrigerators
Water coolers
Room air conditioners

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Refrigeration and Air Conditioning
Most thermostatic expansion valves are set for a superheat of

15°C
20°C
10°C
5°C

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