Mechanical interview questions- Thermodynamics
State the First law of thermodynamics.
First law of thermodynamics states that when system undergoes a cyclic process the net heat transfer is equal to work transfer.
Explain Zeroth Law of thermodynamics?
Zeroth law of thermodynamics states that when two systems are separately in thermal equilibrium with a third system, then they themselves is in thermal equilibrium with each other.
State the Kelvin – Plank statement of second law of thermodynamics
Kelvin – Plank states that it is impossible to construct a heat engine working on cyclic process, whose only purpose is to convert all the heat energy given to it into an equal amount of work
Define Ideal gas.
It is defined as a gas having no forces of intermolecular attraction. These gases will follow the gas laws at all ranges of pressures and temperatures.
Define Real gas.
It is defined, as a gas having the forces of attraction between molecules tends to be very small at reduced pressures and elevated temperatures.
What is equation of state?
The relation between the independent properties such as pressure, specific volume and temperature for a pure substance is known as the equation of state.
State Boyle‟s law.
It states that volume of a given mass of a perfect gas varies inversely as the absolute pressure when temperature is constant.
State Charle‟s law.
It states that if any gas is heated at constant pressure, its volume changes directly as its absolute temperature. v ∝ T
State Joule‟s law.
Joule’s law states, “The internal energy of a given quantity of a gas depends only on the temperature”.
State Regnault‟s law.
Regnault’s law states that Cp and Cv of a gas always remains constant.
First law of thermodynamics states that when system undergoes a cyclic process the net heat transfer is equal to work transfer.
Explain Zeroth Law of thermodynamics?
Zeroth law of thermodynamics states that when two systems are separately in thermal equilibrium with a third system, then they themselves is in thermal equilibrium with each other.
State the Kelvin – Plank statement of second law of thermodynamics
Kelvin – Plank states that it is impossible to construct a heat engine working on cyclic process, whose only purpose is to convert all the heat energy given to it into an equal amount of work
Define Ideal gas.
It is defined as a gas having no forces of intermolecular attraction. These gases will follow the gas laws at all ranges of pressures and temperatures.
Define Real gas.
It is defined, as a gas having the forces of attraction between molecules tends to be very small at reduced pressures and elevated temperatures.
What is equation of state?
The relation between the independent properties such as pressure, specific volume and temperature for a pure substance is known as the equation of state.
State Boyle‟s law.
It states that volume of a given mass of a perfect gas varies inversely as the absolute pressure when temperature is constant.
State Charle‟s law.
It states that if any gas is heated at constant pressure, its volume changes directly as its absolute temperature. v ∝ T
State Joule‟s law.
Joule’s law states, “The internal energy of a given quantity of a gas depends only on the temperature”.
State Regnault‟s law.
Regnault’s law states that Cp and Cv of a gas always remains constant.
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