A heat engine produces 40 kW of power while consuming 40 kW of heat from a source

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A heat engine produces 40 kW of power while consuming 40 kW of heat from a source at 1200 K, 50 kW of heat from a source at 1500 K, and rejecting the waste heat to atmosphere at 300 K. Determine
(a) The thermal efficiency of the engine.
(b)What-if Scenario: What would the thermal efficiency be if all the irreversibility could be magically eliminated? Assume no change in heat input from the two sources.
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