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Refrigeration and Air Conditioning

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

-95.2°C
-135.8°C
-107.7°C
-86.6°C

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Refrigeration and Air Conditioning
During sensible cooling,

Wet bulb temperature increases
Partial pressure of vapour remains constant
Relative humidity remains constant
Specific humidity increases

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Refrigeration and Air Conditioning
A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

4 kW
2 kW
3 kW
1 kW

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Refrigeration and Air Conditioning
A vapour absorption refrigeration system

Cools below 0°C
Requires little power consumption
Gives noisy operation
Gives quiet operation

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is ________ dew point temperature.

Higher than
Same as
Lower than
None of these

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Refrigeration and Air Conditioning
The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

Less
More or less depending on ambient conditions
Same
More

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