ISRO Mechanical & Aerospace 2006 - Question 45

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Topic: Thermodynamics

The condition for reversibility of a cycle is-

  • A. Cyclic $\int\frac{dQ}{T}<0$
  • B. Cyclic $\int\frac{dQ}{T}>0$
  • C. Cyclic $\int\frac{dQ}{T}=0$
  • D. None of these

Answer: C. Cyclic $\int\frac{dQ}{T}=0$

Explanation: According to Clausius inequality: $\oint\frac{dQ}{T}=0$ for Reversible cycle, $\oint\frac{dQ}{T}<0$ for Irreversible cycle, and $\oint\frac{dQ}{T}>0$ for Impossible cycle.

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