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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Bell Coleman cycle is a

Reversed Joule cycle
Reversed Rankine cycle
Reversed Carnot cycle
Reversed Otto cycle

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Refrigeration and Air Conditioning
Refrigeration in aeroplanes usually employs the following refrigerant

CO2
Freon-22
Freon-11
Air

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Refrigeration and Air Conditioning
Aqua ammonia is used as refrigerant in the following type of refrigeration system

Compression
Direct
Indirect
Absorption

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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?

0.5
0.25
1.25
0.8

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Refrigeration and Air Conditioning
The condition of refrigerant as it leaves the compressor in a vapour compression system is

Wet vapour
Dry saturated vapour
Saturated liquid
Superheated vapour

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Refrigeration and Air Conditioning
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

Operating the machine at lower speeds
Raising the higher temperature
Operating the machine at higher speeds
Lowering the higher temperature

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