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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During dehumidification process, _________ remains constant.

Specific humidity
Dry bulb temperature
Relative humidity
Wet bulb temperature

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Refrigeration and Air Conditioning
A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

4.33
3.33
2.33
1.33

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Refrigeration and Air Conditioning
In a vapour compression system, the condition of refrigerant before passing through the condenser is

Saturated liquid
Dry saturated vapour
Superheated vapour
Wet vapour

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

Equal to
Less than
None of these
Greater than

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Refrigeration and Air Conditioning
Which of the following refrigerants has lowest freezing point?

Freon-22
CO2
NH3
Freon-12

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Refrigeration and Air Conditioning
The refrigerant for a refrigerator should have

High latent heat
Low latent heat
High total heat
High sensible heat

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