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Refrigeration and Air Conditioning

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

1.33
2.33
4.33
3.33

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Refrigeration and Air Conditioning
The pressure at the outlet of a refrigerant compressor is called

Critical pressure
Back pressure
Discharge pressure
Suction pressure

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Refrigeration and Air Conditioning
In chemical dehumidification process,

Dew point temperature decreases
All of these
Dry bulb temperature increases
Wet bulb temperature decreases

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Refrigeration and Air Conditioning
The condition of refrigerant as it leaves the compressor in a vapour compression system is

Saturated liquid
Superheated vapour
Dry saturated vapour
Wet vapour

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is___ dry bulb temperature.

Higher than
Lower than
None of the listed here
Same as

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Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

20°C DBT and 60% RH
26°C DBT and 50% RH
20°C DBT and 50% RH
26°C DBT and 60% RH

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