A refrigerator absorbs 2000 cal of heat from ice trays. If the coefficient of performance is 4, then work done by the motor is

A carnot refrigerator absorbs heat from water at 0^(@)C and gives it to a room at 27^(@)C. Find the work done by the refrigerator and the coefficient of performance of the machine when it changes 2 kg of water at 0^(@)C to ice at 0^(@)C. Specific latent heat of ice =333 xx 10^(3) Jkg ^(-1)?

In a refrigerator, the external work done on the working substance in one cycle is 20% of the energy extracted from the cold reservoir. The coefficient of performance of the refrigerator is

Explain working of refrigerators/heat pumps and its coefficient of performance.

A Carnot refrigerator has freezer at temperature -8°C. The coefficient of performance of refrigerator is 5. The temperature of surrounding in which heat is rejected, will be

A Camot refrigerator has freezer at temperature -8°C. The coefficient of performance of refrigerator is 5. The temperature of surrounding in which heat is rejected, will BE