Which of the following thermodynamic law gives the concept of enthalpy?

Mechanical Engineering : Engineering Thermodynamics - Quiz(MCQ)

First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Fourth law of thermodynamics

Correct Answer : Option (C) : Third law of thermodynamics

Explanation : The first law of thermodynamics connects a system’s many kinds of kinetic and potential energy to the work it can do and the heat it can transfer. This law, which also includes an extra state variable, enthalpy, is occasionally used to define internal energy.

Recently Updated in Engineering Thermodynamics Questions

When work is dissipated into internal energy, what is the change in the disorderly motion of molecules.

increases

decreases

remains the same

None of the above

Correct Answer : increases

Explanation : We know that increase in internal energy causes more random motion.

The entropy change of a system between two identifiable equilibrium state is ___ when the intervening process is reversible or change of state is irreversible.

same

different

depends on the process

None of the above

Correct Answer : same

Which of the following is an example of low grade energy?

heat or thermal energy

heat from combustion of fossil fuel

heat from nuclear fission or fusion

All of the above

Correct Answer : All of the above