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Q)

Helium gas goes through a cycle ABCDA (consisting of two isochoric and two isobaric lines) as shown in figure. Efficiency of this cycle is nearly : (Assume the gas to be close to ideal gas ) <br><img src="http://clay6.com/mpaimg/1351_a.jpg"/>


( A ) $12.5 \%$
( B ) $15.4 \%$
( C ) $10.5 \%$
( D ) $9.1 \%$

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A)
(B) Efficiency =work done by the gas per cycle/(total heat given to the gas per cycle =(PV)/1.5PV+5PV =2/13 =15.4%
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