A Carnot engine, used as refrigerator ab...

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

10 J

20 J

30 J

40 J

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For which combination of working temperature, the efficiency of Carnot's engine is the least ?

A Carnot's engine works as refrigerator between 250 K and 300K. It receives 500 cal heat from the reservoir at the lower temperature. The amount of work done in each cycle to operate the refrigerator is :

A carnot engine absorbs 1000J of heat energy from a reservoir at 127^(@)C and rejecs 600J of heat energy during each cycle. Calculate (i) efficiency of the engine, (ii) temperature of sink, (iii) amount of useful work done per cycle.

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