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
100 kJ/kg
25 kJ/kg

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Refrigeration and Air Conditioning
The reciprocating refrigerant compressors are very suitable for

Large displacements and high condensing pressures
Small displacements and low condensing pressures
Large displacements and low condensing pressures
Small displacements and high condensing pressures

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