Explore topic-wise MCQs in Thermodynamics.

This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.

1.

Second law efficiency is defined as the ratio of actual thermal efficiency to the maximum possible thermal efficiency.

A. true
B. false
Answer» B. false
Discussion
2.

Two engines having same thermal efficiency but supplied with heat from source at different temperatures,

A. will convert same fraction of heat they receive into work
B. from second law, one will perform better than other
C. this can be considered as a deficiency of the first law
D. all of the mentioned
Answer» E.
Discussion
3.

For a total reversible process,

A. W reversible = useful work
B. irreversibility = 0
C. both of the mentioned
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
4.

The difference between the reversible work and the useful work for a process is called irreversibility.

A. true
B. false
Answer» B. false
Discussion
5.

If the final state of the system is the dead state, the ____ and the ____ become identical.

A. reversible work, exergy
B. irreversible work, exergy
C. reversible work, irreversible work
D. none of the mentioned
Answer» B. irreversible work, exergy
Discussion
6.

Useful work is given by

A. difference between the actual work and the surrounding work
B. W – W for surroundings
C. W – p(V2-V1)
D. all of the mentioned
Answer» E.
Discussion
7.

THE_DIFFERENCE_BETWEEN_THE_REVERSIBLE_WORK_AND_THE_USEFUL_WORK_FOR_A_PROCESS_IS_CALLED_IRREVERSIBILITY.?$

A. true
B. false
Answer» B. false
Discussion
8.

Two engines having same thermal efficiency but supplied with heat from source at different temperatures,$

A. will convert same fraction of heat they receive into work
B. from second law, one will perform better than other
C. this can be considered as a deficiency of the first law
D. all of the mentioned
Answer» E.
Discussion
9.

For_a_total_reversible_process,$

A. W reversible = useful work
B. irreversibility = 0
C. both of the mentioned
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
10.

In the context of first law efficiency and second law efficiency, which of the following statement is true?

A. first law efficiency = energy output / energy input and their difference is the energy loss
B. second law efficiency = exergy output / exergy input and their difference is irreversibility
C. by reducing energy loss, first law efficiency can be reduced and by reducing irreversibilities, second law efficiency can be reduced
D. all of the mentioned
Answer» E.
Discussion
11.

Second_law_efficiency_is_defined_as_the_ratio_of_actual_thermal_efficiency_to_the_maximum_possible_thermal_efficiency.

A. true
B. false
Answer» B. false
Discussion
12.

If the final state of the system is the dead state, the ____ and the ____ become identical?

A. reversible work, exergy
B. irreversible work, exergy
C. reversible work, irreversible work
D. none of the mentioned
Answer» B. irreversible work, exergy
Discussion
13.

The maximum amount of useful work that can be obtained from a system as it undergoes a process between two specified states is called

A. adiabatic work
B. reversible work
C. irreversible work
D. none of the mentioned
Answer» C. irreversible work
Discussion
14.

The surrounding work is zero for

A. cyclic devices
B. steady flow devices
C. system with fixed boundaries
D. all of the mentioned
Answer» E.
Discussion
15.

A dead state

A. is in equilibrium with its surroundings
B. has zero exergy
C. both of the mentioned
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
16.

Exergy is a composite property.

A. true
B. false
Answer» B. false
Discussion
17.

____ is conserved but ____ is not conserved.

A. exergy, energy
B. energy, exergy
C. both exergy and energy are conserved
D. neither exergy nor energy is conserved
Answer» C. both exergy and energy are conserved
Discussion