Thermodynamics

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108 of 190

Question 108 of 190

A thermodynamic system is taken from an original state DD to an intermediate state EE by the linear process shown in the figure. Its volume is then reduced to the original volume from EE to FF by an isobaric process. The total work done by the gas from DD to EE to FF will be

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Answer: (B) 450J450J

Total work done by the gas from DD to EE to FF==Area of ∆DEF∆DEF
Work done during the process DEDE is WDE=12(600+300)(5−2)J{W}_{DE}=\dfrac{1}{2}\left(600+300\right)\left(5-2\right)J
=1350J=1350J
Work done during the process EFEF is WEF=−300×3=−900J{W}_{EF}=-300\times 3=-900J
WDEF=WDE+WEF=450J{W}_{DEF}={W}_{DE}+{W}_{EF}=450J

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