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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?

0.25
0.5
1.25
0.8

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is___ dry bulb temperature.

Lower than
Higher than
None of the listed here
Same as

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Refrigeration and Air Conditioning
For obtaining high COP, the pressure range of compressor should be

Optimum
Low
High
Any value

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Refrigeration and Air Conditioning
The value of C.O.P in vapour compression cycle is usually

Always less than unity
Equal to unity
Always more than unity
Any one of the above

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Refrigeration and Air Conditioning
On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

Takes place at constant pressure
Takes place at constant entropy
Takes place at constant temperature
Involves no change in volume

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Refrigeration and Air Conditioning
Bell Coleman cycle is a

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

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