The coeffcient of performance of a refrigerator working between `10^(@)C` and `20^(@)C` is

The coefficient of performance of a Carnot refrigerator working between 30^(@)C and 0^(@)C is

The coefficient of performance of a Carnot refrigerator working between 30^(@)C & 0^(@)C is

The coefficient of performance of a Carnot refrigerator working between 30^(@) C and 0^(@) C is

The coefficient of performance of a Carnot refrigerator working between 30^(@)C & 0^(@)C is

Calculate the coefficient of performance of an ideal refrigerator working between -13 ^(@)C and 27^(@)C ?

What is the co- efficient of performance (beta) or a carnot refrigerator working between 40^(@) and 0^(@)C ?

Calculate the coefficient of performance of refrigerator working between the temperatures 0^(@)C and 30^(@)C.

If the temperature of the interior of a refrigerator is 7^@C and the temperature of surroundings is 27^@C , What should be the coefficient of performance of the refrigerator working between these temperature ?

Efficiency of a heat engine working between a given source and sink is 0.5 . Coefficient of performance of the refrigerator working between the same source and the sink will be