Mechanical Engineering - Thermodynamics - Discussion

What is pvn?

pvn mean pv power n in which the process is polytropic.

What is n or pvn? please inform.

It is a polytropic process, p is pressure, we is volume and n is polytropic index.

How we can say that all of above is irreversible process? please tell me.

1) In the irreversible process the initial state of the system and surroundings cannot be restored from the final state.

2) During the irreversible process the various states of the system on the path of change from initial state to final state are not in equilibrium with each other.

3) During the irreversible process the entropy of the system increases decisively and it cannot be reduced back to its initial value.

4) The phenomenon of a system undergoing irreversible process is called as irreversibility.

Answer is wrong. It is also reversible process. So false is correct answer.

In reversible process initial states to final states and can be back to initial. And these process do not came in initial state.

Then these process is irreversible process.

Is that these processes can not back their initial stage then which process get back their initial stage.

False is correct. Because there is constant pressure process, it means pressure at state point 1 is equal to pressure at state point 2. So there is no energy loss. Similarly this concept is applicable to constant volume process also. So it is reversible process.