Test: Entropy - 2 - Mechanical Engineering MCQ

TdS= dU + PdV
This equation holds good for any process reversible or irreversible, undergone by a closed system, since it is a relation among properties which are independent of the path.

a) An irreversible process increases the entropy of the universe. Because entropy is a state function, the change in entropy of the system is the same, whether the process is reversible or irreversible.
b) The total entropy of a system either increases or remains constant; it never decreases. Entropy is zero in a reversible process; it increases in an irreversible process.
c) Once some entropy is created in a process , the universe has to carry the burden of that entropy forever .

Hence,

⇒For cycle is possible This is known as Clausius inequality.

Gibbs function
G = H - TS
• Mechanical work is high grade energy
• Zeroth law gives the concept of temperature
• is known as Clausius inequality

Increase in entropy of a system leads to increase in randomness and degradation of energy.

For reversible adiabatic process