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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be

43834
43833
3
4

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Refrigeration and Air Conditioning
Superheating in a refrigeration cycle

Increases C.O.P
Decreases C.O.P
O.P remains unaltered
Other factors decide C.O.P

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Refrigeration and Air Conditioning
During heating and humidification, the final relative humidity of air

None of the listed here
Can be lower or higher than that of the entering air
Is lower than that of the entering air
Is higher than that of the entering air

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Refrigeration and Air Conditioning
The sensible heat factor during cooling and dehumidification process is given by (where h₁ = Enthalpy of air entering the cooling coil, h₂ = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process)

(hA - h2)/ (h1 - h2)
(hA - h1)/ (h2 - h1)
(h1 - h2)/ (hA - h2)
(h2 - hA)/ (h1 - h2)

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-107.7°C
-86.6°C
-135.8°C
-95.2°C

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Refrigeration and Air Conditioning
During humidification process, __________ increases.

Relative humidity
Dry bulb temperature
Specific humidity
Wet bulb temperature

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