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Refrigeration and Air Conditioning

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

None of these
Less than
Greater than
Equal to

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Refrigeration and Air Conditioning
Critical temperature is the temperature above which

A gas will immediately liquefy
Water will evaporate
Water will never evaporate
A gas will never liquefy

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Refrigeration and Air Conditioning
A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called

Dry air
Moist air
Saturated air
Specific humidity

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Refrigeration and Air Conditioning
During a refrigeration cycle, heat is rejected by the refrigerant in a

Condenser
Evaporator
Compressor
Expansion valve

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Refrigeration and Air Conditioning
During sensible cooling,

Specific humidity increases
Relative humidity remains constant
Wet bulb temperature increases
Partial pressure of vapour remains constant

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Refrigeration and Air Conditioning
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

25°C DBT and 100% RH
22°C DBT and 60% RH
25°C DBT and 40% RH
20°C DBT and 80% RH

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