Irreversibility of process wrt temperature - Thermodynamics

Q.  If temperature difference between two bodies in which heat transfer takes place increases, the irreversibility of the process
- Published on 20 Aug 15

a. increases
b. decreases
c. does not change
d. approaches toward reversibility

ANSWER: increases
If the temperature difference between the two bodies approaches zero, the heat transfer process approaches irreversibility. In a reversible heat transfer process the temperature difference is infinitely small. But to transfer a finite amount of heat through an infinitesimal temperature difference, we need infinite time or infinite area. But this is not possible. Actual heat transfer process takes place through a finite temperature difference and these are irreversible. Therefore as temperature difference increases, the irreversibility also increases.

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