A heat engine takes its working substance around a process that is:
ARandom
BCyclic
CStraight
DOne way
Answer & Solution
Correct answer: B. Cyclic
1. The substance must return to its starting state.
2. Only then can the engine repeat the operation.
3. So the process is cyclic.
_Source: NCERT Class 11 Physics Part II, Chapter 12, Thermodynamics._
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