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Refrigeration and Air Conditioning

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
0.5
1.25
0.25

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Refrigeration and Air Conditioning
The difference between dry bulb temperature and wet bulb temperature, is called

Dew point depression
Degree of saturation
Dry bulb depression
Wet bulb depression

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

None of these
Decreases
Increases
Remains constant

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Refrigeration and Air Conditioning
For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is

Screw
Rotating
Centrifugal
Reciprocating

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Refrigeration and Air Conditioning
The optimum effective temperature for human comfort is

Not dependent on season
Same in winter and summer
Higher in winter than in summer
Lower in winter than in summer

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Refrigeration and Air Conditioning
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called

Humidity ratio
Degree of saturation
Relative humidity
Absolute humidity

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