Entropy Generation and Irreversibility: Interactive Learning Quizzes

Question 1

In a closed system undergoing a reversible process, what is the change in entropy?

Accepted Answer

Zero

Answer

Positive

Answer

Negative

Answer

Cannot be determined

Question 2

Which of the following is NOT a source of entropy generation in a fluid flow process?

Accepted Answer

Isothermal compression

Answer

Viscosity

Answer

Heat transfer across a finite temperature difference

Answer

Chemical reaction

Question 3

In a typical combustion process, the dominant source of entropy generation is:

Accepted Answer

Both chemical reaction and heat transfer

Answer

Chemical reaction

Answer

Heat transfer

Answer

Fluid flow

Question 4

Which of the following processes is NOT a cause of entropy generation in a thermodynamic system?

Accepted Answer

Adiabatic reversible processes

Answer

Friction

Answer

Heat transfer across a finite temperature difference

Answer

Chemical reactions

Question 5

Which of the following processes is most likely to be irreversible?

Accepted Answer

Adiabatic combustion of a fuel

Answer

Adiabatic expansion of an ideal gas

Answer

Isothermal compression of a liquid

Answer

Isochoric heating of a solid

Question 6

In a closed system undergoing an irreversible process, which of these DOES NOT cause entropy to increase?

Accepted Answer

Frictionless movement

Answer

Heat transfer with a temperature difference

Answer

Mixing fluids at different temperatures

Answer

Chemical reactions not at equilibrium

Question 7

Which of the following is a consequence of entropy generation in a thermodynamic system?

Accepted Answer

Increased disorder

Accepted Answer

Energy dissipation

Answer

Enhancement of system efficiency

Question 8

In a reversible adiabatic process, what is the change in the system's entropy?

Accepted Answer

Zero

Answer

Positive

Answer

Negative

Answer

Cannot be determined

Question 9

Which of the following is NOT a source of entropy generation?

Accepted Answer

Adiabatic compression of an ideal gas without friction

Answer

Friction in mechanical systems

Answer

Heat transfer through a finite temperature gradient

Answer

Mixing of two ideal gases at the same temperature

Question 10

In an adiabatic irreversible process, the entropy of the system:

Accepted Answer

Increases

Answer

Stays the same

Answer

Cannot be determined

Answer

Decreases

Question 11

Which of the following statements about entropy generation is true?

Accepted Answer

It is always positive in irreversible processes.

Answer

It is not related to energy transfer.

Answer

It can be negative in reversible processes.

Answer

It is only significant in chemical reactions.

Question 12

A process where there is no change in entropy is called:

Accepted Answer

Reversible

Answer

Adiabatic

Answer

Isothermal

Answer

Irreversible

Question 13

The Clausius inequality implies that:

Accepted Answer

The total entropy of an isolated system can never decrease.

Answer

The entropy of an open system can be constant.

Answer

All processes are reversible.

Answer

The entropy of a closed system can increase.

Question 14

The Carnot cycle is:

Accepted Answer

A reversible heat engine operating between two reservoirs with isothermal and adiabatic processes.

Answer

An irreversible heat engine operating between two reservoirs.

Answer

A cycle that generates no entropy

Answer

A cycle that converts all heat into work

Question 15

Identify the process that is irreversible:

Accepted Answer

Heat transfer through a temperature gradient

Answer

Isothermal expansion

Answer

Adiabatic compression

Question 16

Define the physical significance of entropy generation:

Accepted Answer

Quantifies the reduction in work potential due to irreversibilities

Answer

Measures the randomness of a system

Answer

Indicates the thermal energy of a system

Question 17

Identify the factor that contributes to entropy generation in fluid flow:

Accepted Answer

Viscosity

Answer

Pressure

Answer

Temperature

Answer

Volume

Question 18

In a closed system undergoing an irreversible process, what happens to its entropy?

Accepted Answer

Increases

Answer

Becomes negative

Answer

Remains constant

Answer

Decreases

Question 19

Which device is designed to minimize entropy generation?

Accepted Answer

Carnot heat engine

Answer

Steam turbine

Answer

Diesel engine

Answer

Refrigerator

Question 20

Describe the relationship between entropy generation and exergy destruction:

Accepted Answer

Equivalent concepts representing the lost work potential due to irreversibilities

Answer

Entropy generation is always positive, while exergy destruction can be negative

Answer

Entropy generation measures randomness, while exergy destruction measures work potential loss

Question 21

Provide a practical application of entropy generation analysis:

Accepted Answer

Optimizing the efficiency of power plants

Answer

Detecting fraud

Answer

Predicting weather patterns

Answer

Designing new materials