A heat engine absorbs 250 kcal of heat from a high temperaturereservoir and exha

Question

A heat engine absorbs 250 kcal of heat from a high temperaturereservoir and exhast 175 kcal to a low temp resvoir. a) Determine engine's thermalefficiency from the efficiency of an ideal gas heatengine, b) from the efficiency that you have calculated how much heatis actually converted in to useful work? A heat engine absorbs 250 kcal of heat from a high temperaturereservoir and exhast 175 kcal to a low temp resvoir. a) Determine engine's thermalefficiency from the efficiency of an ideal gas heatengine, b) from the efficiency that you have calculated how much heatis actually converted in to useful work?

Explanation / Answer

So efficiency = 1(efficiency of ideal gas engine is 1) - lostheat efficiency                      =1- 175/250                  = 30% useful work done = heat absorbed x efficiency           = 250 x30%           =75 Kcal

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