1.

A reversibleheatengine A(basedon carnot cycle ) absorbs heat froma reservoirat 1000 K and rejects heat to a reservoirat T_(2) . A secondreserviour at T_(2) and rejects energy to areservoirat360 K .If the efficienciesof engines A and Bare thesame then the temperature T_(2)is .

Answer»

680 K
640 K
600 K
None

Solution :ForA
`eta_(1)= 1- (T_(2))/(1000)`
For B
`eta_(2) = 1-(360)/(T_(2))`
`1- (T_(2))/(1000)= 1 -(360)/(T_(2))`
`T_(2)= 600K`


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