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Refrigeration and Air Conditioning

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

Equal to
Less than
Greater than
None of the listed here

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Refrigeration and Air Conditioning
Carbon dioxide is

Odourless
Non-flammable
Colourless
All of the listed here

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Refrigeration and Air Conditioning
The temperature of ammonia after compression in a vapour compression system is

20 to 50°C
70 to 110°C
50 to 70°C
None of these

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Refrigeration and Air Conditioning
For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is

20
100
Zero
50

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Refrigeration and Air Conditioning
The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

None of the listed here
Sub-cooling or under-cooling
Normal cooling
Super-cooling

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Refrigeration and Air Conditioning
For obtaining high COP, the pressure range of compressor should be

Low
Any value
Optimum
High

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