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An engine operates by taking a monatomic ideal gas through the cycle shown in the figure. The percentage efficiency of the engine is close to

Correct answer

19

Step-by-step solution

W = 2 P 0 v 0 Q + = W AB + W BC = n . c v ΔT AB + nC P ΔT B C = 3 2 × 3 P 0 v 0 − P 0 v 0 + 5 2 6 P 0 V 0 − 3 P 0 V 0 = 3 P 0 V 0 + 15 2 P 0 V 0 = 21 2 P 0 V 0 η = W Q + = 2 P 0 V 0 21 2 P 0 V 0 = 4 21 η % = 400 21 ≈ 19

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