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

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Refrigeration and Air Conditioning
The wet bulb depression indicates _________ humidity of the air.

None of these
Specific
Absolute
Relative

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

R-12
Carbon dioxide
Sulphur dioxide
Ammonia

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Refrigeration and Air Conditioning
During heating and dehumidification process, dry bulb temperature

Remains constant
Increases
None of these
Decreases

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Refrigeration and Air Conditioning
The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called

Avogadro's hypothesis
Dalton's law of partial pressures
Kinetic theory of gases
Newton's law of gases

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Refrigeration and Air Conditioning
The operating temperature of a cold storage is -2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

3.72 kW
1.86 kW
18.6 kW
7.44 kW

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