A reversible heat engine is supplied with heat from two constant temperature

Question

sources at 900 K and 600 K and rejects heat to a constant temperature source at 300 K. The engine develops 100 KW and rejects 400 KJ/min. Determine the heat supplied by each source per minute and efficiency of the engine.

Answer 1

There seems to be some error in the data.

Are you sure it is 400 KJ/min ?

This would mean that engine efficiency will be

100 / (100 + 400/60) which is more than possible even with 900 K heat source.