What is unavailable energy?- Thermodynamics

Q.  What is unavailable energy (U. E.)
- Published on 19 Aug 15

a. Energy supplied to a cyclic heat engine
b. Maximum energy utilized to produce maximum work from a certain heat supplied to a cyclic heat engine
c. Minimum heat energy rejected to sink by second law
d. Maximum heat energy rejected to sink by second law

ANSWER: Minimum heat energy rejected to sink by second law

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