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Thermodynamics - Change in efficiency of an engine

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Thermodynamics: Due to design changes, the efficiency of an engine decreases from 0.23 to 0.42. For the same input heat Qh. These changes increase the work done by the more efficient engine and reduce the amount of heat rejected to the cold reservoir. Find the ratio of heat rejected to the cold reservoir.

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Efficiency of an engine is:

e = W/Qh = Qh- Qc)/Qh = 1 - Qc/Qh

Where, W is the mechanical energy, Qh is the heat absorbed from the hot reservoir and Qc is the heat dumped in to the cold reservoir. ...

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