Helium gas goes through a cycle

Question:

Helium gas goes through a cycle $\mathrm{ABCDA}$ (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) :-

  1. $12.5 \%$

  2. $15.4 \%$

  3. $9.1 \%$

  4. $10.5 \%$


Correct Option: , 2

Solution:

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