Engineering
Physics
Physical Quantities
Question

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)

 

9.1%

15.4%

12.5%

10.5%

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Solution
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 QAB=nCv[p0v0R],QBC=nCp[2P0v0R]

QCD=nCv[2p0v0R],QDA=nCp[p0v0R]

Qrepected = Q0 + QDA

Qabsorbed = QAB + QBC

 η=1QrejQab=0.154

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