Q.

An ideal monoatomic gas is carried around the cycle ABCDA as shown in the figure. The efficiency of the gas cycle is

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a

421

b

221

c

231

d

431

answer is A.

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Detailed Solution

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AB: V= (constant )

QAB=nCvΔT=n32RΔT=32nRΔT=32ΔPV

QAB=3P0V0

BC: P=( constant )

QBC=nCPT=n52RT=52nRT=52×PV

QBC=152P0V0

W=area(ABCD)=2P0V0

η=WQin=WQAB+QBC=421

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