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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
1.25
0.5
0.8

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Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

remains same
decreases
depends on other factors
increases

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Refrigeration and Air Conditioning
Air refrigerator works on

None of these
Bell Coleman cycle
Both (A) and (B)
Reversed Carnot cycle

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

It is miscible with oil over large range of temperatures
It has low operating pressures
All of these
It gives higher coefficient of performance

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

Screw
Centrifugal
Reciprocating
Rotating

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Refrigeration and Air Conditioning
During humidification process, __________ increases.

Wet bulb temperature
Dry bulb temperature
Specific humidity
Relative humidity

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