Test: Entropy - 2 - Mechanical Engineering MCQ

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 

To calculate the specific enthalpy of an ideal gas with constant specific heats, you only need to know the temperature.

• Specific enthalpy is a property that depends solely on temperature for ideal gases.
• Pressure, volume, or mass are not required for this calculation.