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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
0.25
1.25
0.5

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

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

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Refrigeration and Air Conditioning
The condition of refrigerant after passing through the condenser in a vapour compression system is

Superheated vapour
Wet vapour
Saturated liquid
Dry saturated vapour

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Refrigeration and Air Conditioning
In chemical dehumidification process,

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

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Refrigeration and Air Conditioning
In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

Suction of compressor
Low pressure side near receiver
Delivery of compressor
High pressure side close to receiver

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

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

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