Engineering Thermodynamics (3131905) MCQs

MCQs of Exergy

Showing 11 to 20 out of 30 Questions
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11.

The actual work done by a system is always ____ than the reversible work, and the difference between the two is called ____ of the process.

(a)

more, irreversibility
(b)

less, irreversibility
(c)

more, reversibility
(d)

less, reversible
Answer:

Option (b)

12.

Irreversibility (I) is also called

(a)

degradation of energy
(b)

work potential
(c)

upgradation of energy
(d)

all of these
Answer:

Option (a)

13.

For a total reversible process

(a)

reversible work = useful work
(b)

irreversibility = 0
(c)

both of the mentioned
(d)

none of the mentioned
Answer:

Option (c)

14.

Irreversibility (I) is always

(a)

greater than zero
(b)

less than zero
(c)

equal to zero
(d)

all of these
Answer:

Option (a)

15.

The quantity T0dSnet represents an increase in

(a)

available energy
(b)

unavailable energy
(c)

exergy
(d)

all of the mentioned
Answer:

Option (b)

16.

Which of the following is true?

(a)

rate of loss of exergy does not depend on the rate of entropy generation
(b)

rate of loss of exergy is inversely proportional to the rate of entropy generation
(c)

rate of loss of exergy is directly proportional to the rate of entropy generation
(d)

none of the mentioned
Answer:

Option (c)

17.

A thermodynamically efficient process would involve ____ exergy loss with ____ rate of entropy generation.

(a)

minimum, minimum
(b)

maximum, maximum
(c)

minimum, maximum
(d)

maximum, minimum
Answer:

Option (a)

18.

Which of the following clearly defines availability or exergy?

(a)

It is the maximum useful work obtainable from a system as it reaches the dead state
(b)

It is the maximum work required to bring the closed system from the dead state to the given state
(c)

It is the anergy of the system
(d)

None of the mentioned
Answer:

Option (a)

19.

Energy is ____ conserved and exergy is ____ conserved.

(a)

always, generally
(b)

always, not generally
(c)

not always, always
(d)

always, always
Answer:

Option (b)

20.

_____________ is a composite property.

(a)

Exergy
(b)

Energy
(c)

Entropy
(d)

All of these
Answer:

Option (a)

Showing 11 to 20 out of 30 Questions
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