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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During a refrigeration cycle, heat is rejected by the refrigerant in a

Expansion valve
Evaporator
Compressor
Condenser

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

125 kJ/kg
100 kJ/kg
50 kJ/kg
25 kJ/kg

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Refrigeration and Air Conditioning
Which of the following refrigerant has the lowest freezing point?

R-22
R-11
Ammonia
R-12

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

-107.7°C
-135.8°C
-86.6°C
-95.2°C

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Refrigeration and Air Conditioning
In a refrigeration system, the expansion device is connected between the

Receiver and evaporator
Evaporator and compressor
Compressor and condenser
Condenser and receiver

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

Same as
None of the listed here
Higher than
Lower than

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