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in Physics by (69.7k points)

Two moles of a monatomic ideal gas is taken through a cyclic process shown on pressure (P) vs temperature(T) diagram in figure. Process CA is represented as PT = constant. If efficiency of given  cyclic process is 1 - 7x / 12l2 + 15,then find x.]

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For process AB TA = 300 K, TB = 600 K

W = nRΔ T = nR (TB – TA ) = 300 nR = 600 R. 

Q = n CpΔ T = 2 × 5/2 R (300) = 1500 R.

For process BC 

Q = W = 1200 R ln 2

For process CA

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