The entropy of an isolated system can never ____

A)
be zero
B)
increase
C)
decrease
D)
None of the above

Correct Answer : Option (C) :   decrease

Explanation : The entropy of an isolated system always increases and remains constant only when the process is reversible.

Recently Updated in Engineering Thermodynamics Questions
When work is dissipated into internal energy, what is the change in the disorderly motion of molecules.
A)
increases
B)
decreases
C)
remains the same
D)
None of the above

Correct Answer :   increases

Explanation : We know that increase in internal energy causes more random motion.

The entropy change of a system between two identifiable equilibrium state is ___ when the intervening process is reversible or change of state is irreversible.
A)
same
B)
different
C)
depends on the process
D)
None of the above

Correct Answer :   same

Which of the following is an example of low grade energy?
A)
heat or thermal energy
B)
heat from combustion of fossil fuel
C)
heat from nuclear fission or fusion
D)
All of the above

Correct Answer :   All of the above

Mechanical Engineering MCQ's

Theory of Machines
Engineering Mechanics
Machine Design
Strength of Materials
Engineering Materials
Hydraulic Machines
Thermodynamics
Engineering Drawing
Workshop Technology
Automobile Engineering
Steam Boilers and Engines
More