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

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Refrigeration and Air Conditioning
The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil)

(td₃ - td₁)/(td₂ - td₃)
(td₃ - td₂)/(td₃ - td₁)
(td₂ - td₃)/(td₃ - td₁)
(td₃ - td₁)/(td₃ - td₂)

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