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

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Refrigeration and Air Conditioning
In a saturated air-water vapour mixture, the

Dry bulb temperature is higher than dew point temperature
Dry bulb, wet bulb and dew point temperature are same
Dew point temperature is lower than wet bulb temperature
Dry bulb temperature is higher than wet bulb temperature

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