Causes of not completing thermodynamic cycle by I C engine - Thermodynamics

Q.  What is the reason of the fact that the internal combustion engine does not complete thermodynamic cycle?
- Published on 19 Aug 15

a. because every time fresh air is taken inside the engine and combustion products are thrown out of the engine
b. because permanent chemical change is undergone by the working fluid in combustion chamber
c. both a. and b.
d. none of the above

ANSWER: both a. and b.

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