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Supposeapersonwantsto increasethe efficienyof thereversibleheatenginethatisoperatingbetween100^(@)C and 300^(@)C Hehadtwowaysto increasethe efficiency . ( a)Bydecreasing thecoldreservoirtemperaturefrom 100^(@)C to 50^(@)Candkeepingthe hotreservoirtemperatureof the hotreservoirfrom 300^(@)Cto 350^(@)Cbykeepingthecoldreservoirtemperatureconstnatwhichis thesuitablemethod ?

Answer» <html><body><p></p>Solution :Heat engine operates at initial temperature `=100^(@)C+273=373K` <br/> Final temperature `=300^(@)C+273=573 K` <br/> At <a href="https://interviewquestions.tuteehub.com/tag/melting-1093090" style="font-weight:bold;" target="_blank" title="Click to know more about MELTING">MELTING</a> point `=273K` <br/> `"Efficiency "eta=1-(T_(2))/(T_(1))=1-(<a href="https://interviewquestions.tuteehub.com/tag/272-1832893" style="font-weight:bold;" target="_blank" title="Click to know more about 272">272</a>)/(573)=0.3491, eta=34.9%` <br/> (a) By <a href="https://interviewquestions.tuteehub.com/tag/decreasing-946148" style="font-weight:bold;" target="_blank" title="Click to know more about DECREASING">DECREASING</a> the cold <a href="https://interviewquestions.tuteehub.com/tag/reservoir-1186140" style="font-weight:bold;" target="_blank" title="Click to know more about RESERVOIR">RESERVOIR</a>, efficiency <br/> `T_(1)=350^(@)C+273=623K, T_(2)=100^(@)C+273=373K` <br/> `eta=1-(T_(2))/(T_(1))=1-(323)/(573)=0.436` <br/> `eta=43.6%` <br/> (<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a>) By increasing the temperature of hot reservoir, efficiency, <br/> `T_(1)=350^(@)C+273=623K, T_(2)=100^(@)C+273=373K` <br/> `eta=1-(T_(2))/(T_(1))=1-(373)/(623)=0.401` <br/> `eta=40.12%` <br/> Method (a) More efficiency than method (b).</body></html>


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