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Thermodynamics — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsThermodynamics2 Marks
Question
Why can't the efficiency of an internal combustion engine be raised beyond a limit?
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Answer

To increase the efficiency $\Big[=1-\Big(\frac{1}{\rho}\Big)^{\gamma-1}\Big],$ the compression ratio $\rho$ has to be increased. $\rho$ cannot be made greater than 10, because then the cylinder of the engine will have to be made very thick and heavy which will be unsuitable for lighter vehicles. Secondly, during the adiabatic compression, the temperature of the air-petrol mixture will be high enough to cause explosion.

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