Question: A heat engine receives heat from a source at 1500 K at a rate of 600 kJ/s and rejects the waste heat to a sink

A heat engine receives heat from a source at 1500 K at a rate of 600 kJ/s and rejects the waste heat to a sink at 300 K. If the power output of the engine is 400 kW, the second-law efficiency of this heat engine is
(a) 42%
(b) 53%
(c) 83%
(d) 67%
(e) 80%

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