Question 1

Which of the following can be considered as an application of entropy principle?

Accepted Answer

A) transfer of heat through a finite temperature difference 
B) mixing of two fluids 
C) maximum temperature obtainable from two finite bodies 
D) all of the mentioned 
A) transfer of heat through a finite temperature difference 
B) mixing of two fluids 
C) maximum temperature obtainable from two finite bodies 
D) all of the mentioned D

Question 2

The lowest practicable temperature of heat rejected is the

Accepted Answer

A) given temperature 
B) 0k 
C) temperature of surroundings 
D) 273k 
A) given temperature 
B) 0k 
C) temperature of surroundings 
D) 273k C

Question 3

For a reversible refrigerator, Coefficient of Performance is given by

Accepted Answer

A) t2/(t1-t2) 
B) t1/(t1-t2) 
C) t2/(t2-t1) 
D) t1/(t2-t1) 
A) t2/(t1-t2) 
B) t1/(t1-t2) 
C) t2/(t2-t1) 
D) t1/(t2-t1) A

Question 4

The entropy increase due to internal irreversibility is also called entropy production or entropy generation.

Accepted Answer

A) True 
 B)False

Question 5

The entropy of any closed system can increase in which if the following way?

Accepted Answer

A) by heat interaction in which there is entropy transfer 
B) dissipative effects or internal irreversibilities 
C) both of the mentioned 
D) none of the mentioned 
A) by heat interaction in which there is entropy transfer 
B) dissipative effects or internal irreversibilities 
C) both of the mentioned 
D) none of the mentioned

Question 6

A chip dissipates 2 kJ of electric work and rejects it as heat transfer from its surface which is at 50°C to 25°C air. How much entropy is generated outside the chip?

Accepted Answer

A) 0.419 j/k 
B) 0.519 j/k 
C) 0.619 j/k 
D) 0.719 j/k 
A) 0.419 j/k 
B) 0.519 j/k 
C) 0.619 j/k 
D) 0.719 j/k

Question 7

Entropy principle is the quantitative statement of the second law of thermodynamics.

Accepted Answer

A) True 
 B)False

Question 8

Lost work is given by

Accepted Answer

A) pdv-dw 
B) pdv+dw 
C) -pdv-dw 
D) pdv*dw 
A) pdv-dw 
B) pdv+dw 
C) -pdv-dw 
D) pdv*dw

Question 9

When considering a finite energy source, its working fluid expands,

Accepted Answer

A) reversibly 
B) adiabatically 
C) reversibly and adiabatically 
D) none of the mentioned 
A) reversibly 
B) adiabatically 
C) reversibly and adiabatically 
D) none of the mentioned

Question 10

Which of the following processes exhibit external mechanical irreversibility?

Accepted Answer

A) isothermal dissipation of work 
B) adiabatic dissipation of work 
C) both of the mentioned 
D) none of the mentioned 
A) isothermal dissipation of work 
B) adiabatic dissipation of work 
C) both of the mentioned 
D) none of the mentioned

Question 11

The complete conversion of heat into shaft- work is impossible.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is an example of low grade energy?

Accepted Answer

A) heat or thermal energy 
B) heat from nuclear fission or fusion 
C) heat from combustion of fossil fuel 
D) all of the mentioned 
A) heat or thermal energy 
B) heat from nuclear fission or fusion 
C) heat from combustion of fossil fuel 
D) all of the mentioned

Question 13

In an open system, there is a transfer of which of the following quantity?

Accepted Answer

A) mass 
B) energy 
C) entropy 
D) all of the mentioned 
A) mass 
B) energy 
C) entropy 
D) all of the mentioned

Question 14

Efficiency of a reversible heat engine is given by

Accepted Answer

A) 1-(t1/t2) 
B) 1-(t2/t1) 
C) (t1/t2)-1 
D) (t2/t1)-1 
A) 1-(t1/t2) 
B) 1-(t2/t1) 
C) (t1/t2)-1 
D) (t2/t1)-1

Question 15

Which of the following is an example of high grade energy?

Accepted Answer

A) mechanical work 
B) electrical energy 
C) water power and wind power 
D) all of the mentioned 
A) mechanical work 
B) electrical energy 
C) water power and wind power 
D) all of the mentioned

Question 16

Which of the following statement is true?

Accepted Answer

A) if the isentropic process is reversible, it must be adiabatic 
B) if the isentropic process is adiabatic, it cannot but be reversible 
C) if the process is adiabatic and reversible, it must be isentropic 
D) all of the mentioned 
A) if the isentropic process is reversible, it must be adiabatic 
B) if the isentropic process is adiabatic, it cannot but be reversible 
C) if the process is adiabatic and reversible, it must be isentropic 
D) all of the mentioned

Question 17

If the path A causes more entropy generation than path B, then

Accepted Answer

A) path a is more irreversible than path b 
B) path a involves more lost work 
C) both of the mentioned 
D) none of the mentioned 
A) path a is more irreversible than path b 
B) path a involves more lost work 
C) both of the mentioned 
D) none of the mentioned

Question 18

Which of the following is a type of energy?

Accepted Answer

A) high grade energy 
B) low grade energy 
C) both of the mentioned 
D) none of the mentioned 
A) high grade energy 
B) low grade energy 
C) both of the mentioned 
D) none of the mentioned

Question 19

The unavailable energy is the product of the lowest temperature of heat rejection and the change of entropy of system during the process of supplying heat.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following statement is false?

Accepted Answer

A) for a reversible process, entropy generation is zero 
B) the entropy generation does not depend on the path the system follows 
C) for an irreversible process, entropy generation is greater than zero 
D) none of the mentioned 
A) for a reversible process, entropy generation is zero 
B) the entropy generation does not depend on the path the system follows 
C) for an irreversible process, entropy generation is greater than zero 
D) none of the mentioned

Which of the following can be considered as an application of entropy principle?

The lowest practicable temperature of heat rejected is the

For a reversible refrigerator, Coefficient of Performance is given by

The entropy increase due to internal irreversibility is also called entropy production or entropy generation.

The entropy of any closed system can increase in which if the following way?

A chip dissipates 2 kJ of electric work and rejects it as heat transfer from its surface which is at 50°C to 25°C air. How much entropy is generated outside the chip?

Entropy principle is the quantitative statement of the second law of thermodynamics.

Lost work is given by

When considering a finite energy source, its working fluid expands,

Which of the following processes exhibit external mechanical irreversibility?

The complete conversion of heat into shaft- work is impossible.

Which of the following is an example of low grade energy?

In an open system, there is a transfer of which of the following quantity?

Efficiency of a reversible heat engine is given by

Which of the following is an example of high grade energy?

Which of the following statement is true?

If the path A causes more entropy generation than path B, then

Which of the following is a type of energy?

The unavailable energy is the product of the lowest temperature of heat rejection and the change of entropy of system during the process of supplying heat.

Which of the following statement is false?

Thermodynamics and Properties of Systems

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Thermodynamics and Entropy

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Exam 13: Thermodynamics and Entropy Principles

Which of the following can be considered as an application of entropy principle?

The lowest practicable temperature of heat rejected is the

For a reversible refrigerator, Coefficient of Performance is given by

The entropy increase due to internal irreversibility is also called entropy production or entropy generation.

The entropy of any closed system can increase in which if the following way?

A chip dissipates 2 kJ of electric work and rejects it as heat transfer from its surface which is at 50°C to 25°C air. How much entropy is generated outside the chip?

Entropy principle is the quantitative statement of the second law of thermodynamics.

Lost work is given by

When considering a finite energy source, its working fluid expands,

Which of the following processes exhibit external mechanical irreversibility?

The complete conversion of heat into shaft- work is impossible.

Which of the following is an example of low grade energy?

In an open system, there is a transfer of which of the following quantity?

Efficiency of a reversible heat engine is given by

Which of the following is an example of high grade energy?

Which of the following statement is true?

If the path A causes more entropy generation than path B, then

Which of the following is a type of energy?

The unavailable energy is the product of the lowest temperature of heat rejection and the change of entropy of system during the process of supplying heat.

Which of the following statement is false?

Thermodynamics and Properties of Systems

Thermodynamics: Concepts and Laws

Thermodynamics and Entropy

Thermodynamics Laws, Processes, and Efficiency

Gas Laws and Thermodynamics

Thermodynamics and Gas Laws

Thermodynamics

Steam Power Plant and Rankine Cycle

Thermodynamics and Rankine Cycle

Energy and Thermodynamics

Concepts of Heat Transfer, Irreversibility, and Thermodynamic Properties

Thermodynamics and Heat Transfer

Thermodynamics and Properties of Substances

Rankine Cycle and Properties of Steam

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Thermodynamics and Gas Mixtures: Equations, Properties, and Applications

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Thermodynamics and the Second Law: Efficiency, Entropy, and Exergy

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