Exergy of Heat Input in a Cycle - MCQs with Answers

Q1. What is available energy (A. E.)

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

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ANSWER: b. Maximum energy utilized to produce maximum work from a certain heat supplied to a cyclic heat engine



Q2. What is unavailable energy (U. E.)

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

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ANSWER: c. Minimum heat energy rejected to sink by second law



Q3. What is the effect on exergy output of a process, when heat is transferred through a finite temperature difference?

a. exergy output increases
b. exergy output decreases
c. exergy output remains same
d. none of the above

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ANSWER: b. exergy output decreases


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