railway RRB JE (CBT I + CBT II) Mock Test 2024 Thermodynamics Second Law of Thermodynamics and Entropy Efficiency of Reversible Heat Engine
A heat engine receives 1 kW of heat transfer at 1200 K and gives out 600 W as work, with the rest as heat transfer to the ambient at 300 K. The second-law efficiency of the engine is:
1
70%
2
90%
3
80%
4
60%