Question

In: Mechanical Engineering

Determine whether the following statements are correct (y) or not (n): and explain why.. ( )...

Determine whether the following statements are correct (y) or not (n): and explain why..

( ) A system have a higher second law efficiency than the first law efficiency during a process

( ) It is impossible that the energy of one isolated system increases

( ) Adding moisture is the ONLY way to obtain saturated air from unsaturated air

( ) A Piston Cylinder device contains air. During a reversible, isothermal process the entropy of the air will never decrease.

Solutions

Expert Solution

1. A system can have higher second law efficiency than the first law efficiency during a process hence statement is correct(y).

2. The entropy of a system must always increase, as entropy is a measure of energy dispersion it will always increase for an isolated system. hence Statement is not correct(n).

3. Adding moisture and cooling the Air at constant pressure are the methods to obtain saturated air from the unsaturated air. Hence statement is not correct(n).

4. During a reversible, isothermal process the entropy of air will sometimes increase or decrease because of change in volume by applying pressure. hence statement is not correct(n).

samet mamat answered 2 years ago
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