Mechanical Engineering - Thermodynamics - Discussion

For a cyclic process, the system returns to its original state at the end of the process, so its entropy change is zero. But for the surroundings, that are typically envisioned as being comprised of ideal reservoirs, the entropy change is not necessarily zero. In the case of a reversible cycle, the change in entropy of the surroundings is zero. But, for an irreversible cycle, any entropy that is generated within the system during the cycle is transferred to the surroundings.

So, in this case, the entropy of the surroundings increases, but the entropy change of the system is still zero.

Entropy is a property. Property is a point function. We know that change in the property of any cycle is zero. Means, the property of any cycle is constant if it's reversible or irreversible.

So, the correct answer is (A) remain constant.

Remains constant is the correct answer.

Entropy will increase, see how in this case;

S2>>>S1.
dS=S1-S2 = negative value Or less than 0.

So, it is a case of irreversible process.

All the 3 options are correct because in irreversible heat rejection process entropy may increase decrease or remain constant.

How entropy is an external property of a system?

Entropy is the property of a system which increases with addition of heat and decreases with removel of heat.

In irrevcesible process the system is not restore the intial position so we ading heat to do the work done so in irreversible its alwase increases.

Entropy is the level of disorderness.

Entropy is a external property of the system.

What is entropy?