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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The heat rejection factor (HRF) is given by

1 + C.O.P
1 + (1/C.O.P)
1 - (1/C.O.P)
1 - C.O.P.

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Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/h
m/h
m²/hK
m/hK

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Refrigeration and Air Conditioning
The boiling point of ________ is 10.5°C.

R-12
Sulphur dioxide
Ammonia
Carbon dioxide

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Refrigeration and Air Conditioning
In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is

Cooled and dehumidified
Heated and dehumidified
Heated and humidified
Cooled and humidified

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Refrigeration and Air Conditioning
The emissivity of a polished silver body is ____ as compared to black body.

High
Very low
Same
Low

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Refrigeration and Air Conditioning
In a reversed Brayton cycle, the heat is absorbed by the air during

Isentropic compression process
Isentropic expansion process
Constant pressure cooling process
Constant pressure expansion process

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