ThermodynamicsHard

Question

Which of the following statement(s) is/are true for ideal gas?

Options

A.(−wrev) – (−wirr) > 0 for isothermal expansion.
B.wrev > wirr for isothermal compression.
C.Heat rejected in isothermal process is greater in (n – 1)th stage as compared to nth stage work.
D.Arrow shown in the graph below indicates the decreasing value of γ.

Solution

$w_{rev} - w_{irr} = ( - P.dV) - \left( - P_{ext}.dV \right)$

$= \left( P_{ext} - P \right).dV = \text{ negative, always and } $$$q_{rev} - q_{irr} = \text{positive, always}$$

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