1. A heat transfer process approaches reversibility as the temperature difference between two bodies approaches
a) infinity
b) zero
c) -1
d) 1
Explanation: For heat transfer to be reversible, heat must be transferred through an infinitesimal temperature difference.
2. Free expansion is irreversible.
a) true
b) false
Explanation: It can be demonstrated by the second law.
3. All actual heat transfer processes are
a) irreversible
b) take place through a finite temperature difference
c) both of the mentioned
d) none of the mentioned
Explanation: An infinitesimal temperature difference is not easy to attain.
4. Which of the following can be a cause of irreversibility?
a) friction, viscosity
b) inelasticity
c) electrical resistance, magnetic hysteresis
d) all of the mentioned
Explanation: These effects are known as dissipative effects
5. The continual motion of a movable device in the complete absence of friction is known as
a) PMM2
b) PMM3
c) PMM1
d) PMM0
Explanation: This is not possible since lubrication cannot be completely eliminated.
6. Which of the following is irreversible?
a) stirring work
b) friction work in moving devices
c) current flowing through a wire
d) all of the mentioned
Explanation: All these processes includes a particular cause of irreversibility.
7. A process will be reversible if it has
a) no dissipative effects
b) dissipative effects
c) depends on the given conditions
d) none of the mentioned
Explanation: Without any dissipative effects, a process can perform in a reversible manner.
8. Irreversibility can be distinguished in how many types?
a) 0
b) 1
c) 2
d) 3
Explanation: Tow types of irreversibility are internal and external irreversibility.
9. Internal irreversibility is caused by
a) internal dissipative effects
b) friction, turbulence
c) electrical resistance, magnetic hysteresis
d) all of the mentioned
Explanation: Internal dissipative effects are the major cause of internal irreversibility.
10. Which of the following is true?
a) mechanical irreversibility is due to finite pressure gradient
b) thermal irreversibility is due to finite temperature gradient
c) chemical irreversibility is due to finite concentration gradient
d) all of the mentioned
Explanation: These are some other distinctions of irreversibility.