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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be

Anything
Equal
Small
High

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Refrigeration and Air Conditioning
The cooling system used for supersonic aircrafts and rockets is

Regenerative air cooling system
Reduced ambient air cooling system
Bootstrap air cooling system
Simple air cooling system

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Refrigeration and Air Conditioning
The wet bulb temperature during sensible heating of air

None of these
Increases
Remains constant
Decreases

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Refrigeration and Air Conditioning
Highest temperature encountered in refrigeration cycle should be

Near critical temperature of refrigerant
At critical Temperature
Much below critical temperature
Above critical temperature

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Refrigeration and Air Conditioning
Pressure of water vapour is given by

μ/[1 - (1 - μ) (Ps/Pb)]
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
None of these
0.622 Pv/ (Pb - Pv)

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Refrigeration and Air Conditioning
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

1
1.25
5.12
2.15

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