question_answer

A Carnot engine absorbs 1000 J of heat energy from a reservoir at 127°C and rejects 600 J of heat energy during each cycle. The efficiency of engine and temperature of sink will be:                         [JEE ONLINE 12-04-2014]

A)  20% and – 43°C

B)       40% and – 33°C

C)  50% and – 20°C

D)       70% and – 10°C

Correct Answer: B

Solution :

[b] Given:

Efficiency of cannot engine,

or

or,