Heat engine and refrigerator

A Carnot engine work as refrigerator in between 0^(@)C and 27^(@)C . How much energy is needed to freeze 10 kg ice at 0^(@)C /

A Carnot engine, used as refrigerator absorbs 380 J energy in one cycle from low temperature reservoir. If efficiency of this Carnot engine is 5% then amount of work done on refrigerator per cycle is

Relationship between efficiency of heat engines and coefficient of performance.

Assertion: Efficiency of a heat engine can't be greater than efficiency of Carnot engine. Reason: Effieciency of any engine is never 100%

Assertion:Cooling inside a refrigerator is not proper when a thick layer of ice deposits on the freezer . Reason : Ice is a bad conductor of heat

A Carnot heat engine has an efficiency of 10% . If the same engine is worked backward to obtain a refrigerator, then find its coefficient of performance.

A carnot engine having an efficiency of (1)/(5) is being used as a refrigerator. If the work done on the refrigerator is 8 J, the amount of heat absorbed from the reservoir at lower temperature is:

A carnot engine having an efficiency of 1/4 is being used as a refrigerator. If the work done on the refrigerator is 5 J, the amount of heat absorbed from the reservoir at lower temperature is:

A carnot engine having an efficiency of 1/4 is being used as a refrigerator. If the work done on the refrigerator is 5 J, the amount of heat absorbed from the reservoir at lower temperature is: