InterviewSolution
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InterviewSolution
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`P - V` diagram of a cyclic process `ABCA` is as shown in Fig. Choose the correct alternative A. `DeltaQ_(A)rarr_(B)` is negativeB. `DeltaU_(B)rarr_(C)` is positiveC. `DeltaU_(C)rarr_(A)` is negativeD. `DeltaW_(CAB)` is negative |
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Answer» Correct Answer - A::B::D During process `A and B` , pressure and volume both are decreasing. Therefore, temperature and hence internal energy of the gas will decrease `(TalphaPV) or DeltaV_(A)rarr_(B)=` negative. Further, `DeltaW_(A)rarr_(B)` is negative. In process B to C, pressure of the gas is constant while volume is increasing. Hence, temperature should increase or `DeltaU_(B)rarr_(C)` positive. During `C` to `A` volume is constant while pressure is increasing. Therefore, temperature and hence internal energy of the gas should increase off `DeltaU_(C)rarr_(A)` positive. During process `CAB` , volume of the gas in decreasing. Hence, work done by the gas is negative. |
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