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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
Pick up the wrong statement. A refrigerant should have

Higher critical temperature
High latent heat of vaporisation
Tow specific heat of liquid
High boiling point

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Refrigeration and Air Conditioning
In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Reversed Otto cycle
Reversed Joule cycle
Reversed Brayton cycle
Reversed Carnot cycle

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Refrigeration and Air Conditioning
Vapour compression refrigeration is somewhat like

Carnot cycle
Reversed Carnot cycle
None of these

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Refrigeration and Air Conditioning
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called

Degree of saturation
Relative humidity
Humidity ratio
Absolute humidity

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Refrigeration and Air Conditioning
Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

0.8
0.25
0.5
1.25

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