1) What is the dead state of the system?
a. the state at which system is in pressure and temperature equilibrium with the surroundings
b. the state at which system is in chemical equilibrium with the surroundings
c. the state at which system must have zero velocity and minimum potential energy
d. all of the above
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Answer
Explanation
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ANSWER: all of the above
Explanation:
No explanation is available for this question!
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2) The ratio of minimum exergy which must be consumed to perform the task to the actual amount of energy consumed in performing the same task is called as
a. first law efficiency
b. second law efficiency
c. exergy efficiency
d. none of the above
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Answer
Explanation
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ANSWER: second law efficiency
Explanation:
No explanation is available for this question!
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3) People use electric energy to heat and light homes. What does it indicate?
a. People are destroying energy
b. People are creating energy
c. People are converting energy from more exergy value to less exergy value
d. People are converting energy from less exergy value to more exergy value
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Answer
Explanation
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ANSWER: People are converting energy from more exergy value to less exergy value
Explanation:
No explanation is available for this question!
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4) What does the exergy principle state?
a. The exergy of an isolated system can never decreases, but always increases
b. The exergy of an isolated system can never increases, but always decreases
c. The exergy of an isolated system can either increases or decreases
d. cannot say
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Answer
Explanation
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ANSWER: The exergy of an isolated system can never increases, but always decreases
Explanation:
No explanation is available for this question!
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5) Exergy is not conserved but destroyed in the process. What is the reason behind this?
a. reversibility
b. irreversibility
c. both reversibility and irreversibility
d. none of the above
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Answer
Explanation
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ANSWER: irreversibility
Explanation:
No explanation is available for this question!
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6) What is the value of exergy in general?
a. only negative
b. only positive
c. sometimes positive sometimes negative
d. cannot say
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Answer
Explanation
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ANSWER: only positive
Explanation:
No explanation is available for this question!
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7) Which will be a suitable condition of exergy loss and entropy generation for thermodynamically efficient process?
a. maximum exergy loss with minimum rate of entropy generation
b. minimum exergy loss with maximum rate of entropy generation
c. maximum exergy loss with maximum rate of entropy generation
d. minimum exergy loss with minimum rate of entropy generation
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Answer
Explanation
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ANSWER: minimum exergy loss with minimum rate of entropy generation
Explanation:
No explanation is available for this question!
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8) What is the difference between work done by a system through an ideal reversible process and actual work done by the system called?
a. irreversibility
b. degradation
c. dissipation
d. all of the above
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Answer
Explanation
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ANSWER: all of the above
Explanation:
No explanation is available for this question!
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9) How is the Gibbs function (G) represented?
Where U represents internal energy
T represents temperature
S represents entropy
a. G = U + pV + TS
b. G = U – pV – TS
c. G = U + pV – TS
d. G = U – pV + TS
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Answer
Explanation
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ANSWER: G = U + pV – TS
Explanation:
No explanation is available for this question!
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10) How is the Helmholtz functions (F) represented?Where U represents internal energy
T represents temperature
S represents entropy
a. F = U + TS
b. F = U – TS
c. F = UT – S
d. F = UT + S
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Answer
Explanation
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ANSWER: F = U – TS
Explanation:
No explanation is available for this question!
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