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Q)

An engine operates by taking n moles of an ideal gas through the cycle $ABCDA$ shown in figure. The thermal efficiency of the engine is : (Take Cv=1.5 R, where R is gas constant)

$\begin{array}{1 1}(1)\; 0.24\\ (2)\; 0.15\\ (3)\; 0.32\\ (4)\; 0.08 \end{array} $

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