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Refrigeration and Air Conditioning

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

Higher than
Lower than
None of these
Same as

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Refrigeration and Air Conditioning
The COP of a domestic refrigerator

Is less than 1
Is equal to 1
Is more than 1
Depends upon the make

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Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Is immaterial
Increases heat transfer rate
Results in loss of heat due to poor heat transfer
Can be avoided by proper design

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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)

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

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Refrigeration and Air Conditioning
The thermostatic expansion valve is used in ________ type of evaporators.

Flooded
DX coil
Dry
None of these

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Refrigeration and Air Conditioning
While designing the refrigeration system of an aircraft, the prime consideration is that the

System has high C.O.P.
Power per TR is low
Mass of refrigerant circulated in the system is low
Mass of the refrigeration equipment is low

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