A refrigerating system operating on reverse Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the exit of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is so K, then the network of compression will be (assume air as the working substance with \[{{c}_{p}}=\,\,1\,\,KJ\,per\,kg\,per{}^\circ C)\]

• A. 250 kJ/kg
• B. 200 kJ/kg
• C. 50 kJ/kg
• D. 25 kJ/kg