Explore topic-wise MCQs in Thermodynamics.

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

Which of the following is mostly neglected while doing calculations for finding maximum work?

Which of the following is true for a closed system?

Which of the following is true for a steady flow system?

Work done in all reversible processes is equal

For a process from state 1 to state 2, heat transfer in an irreversible process is given by

In an open system, for maximum work, the process must be entirely

For a process from state 1 to state 2, heat transfer in a reversible process is given by

Only those processes are possible in nature which would give an entropy ____ for the system and the surroundings together.

A piston-cylinder device initially contains air at 150 kPa and 27 C. At this state, the volume is 400 litre. The mass of the piston is such that a 350 kPa pressure is required to move it. The air is now heated until its volume has doubled. Determine the total heat transferred to the air.

The equation W= vdp holds good for

The equation dQ=dE+dW holds good for

The equation TdS=dU+pdV is obtained from which law?

Which of the following equation is true?

When W=1, we get S=0 which can occur only at T=0K. This is the Nernst-Simon statement of third law of thermodynamics.

According to the Boltzmann,

In the reversible adiabatic expansion of a gas the increase in disorder due to an increase in volume is compensated by the decrease in disorder due to a decrease in temperature.

When does the entropy of a system become zero?

The equation dQ=TdS is true only for a reversible process.

Which of the following factor affects the heat of reaction based on Kirchhoff equation?

Chemical dissociation is

What is the ratio of Cp/Cv for gas if the pressure of the gas is proportional to the cube of its temperature and the process is an adiabatic process?

Which of the following processes is used to do maximum work done on the ideal gas that is compressed to half of its initial volume?

The entropy increase due to internal irreversibility is also called entropy production or entropy generation.

Entropy increase dS of the system can be expressed as

The entropy of any closed system can increase in which if the following way?

Argon in a light bulb is at 90 kPa and heated from 20 C to 60 C with electrical power. Find the total entropy generation per unit mass of argon.

Oxygen gas in a piston cylinder at 300 K, 100 kPa with volume 0.1m^3 is compressed in a reversible adiabatic process to a final temperature of 700 K. Find the final pressure and volume.

A pan contains 5 L of engine oil at 20 C, 100 kPa. Now 2 L of hot 100 C oil is mixed into the pan. Find the entropy generation.

A 4 L jug of milk at 25 C is placed in refrigerator where it is cooled down to a temperature of 5 C. Assuming the milk has the property of liquid water, find the entropy generated in the cooling process.

1kg of ammonia is contained in a piston/cylinder, as saturated liquid at 20 C. Heat is added at 100 C until a final condition of 70 C, 800 kPa is reached. Assuming the process is reversible, find the entropy generation.

A piston/cylinder contains 1 kg water at 20 C, 150 kPa. The pressure is linear in volume. Heat is added from 600 C source until the water is at 1 MPa, 500 C. Find the total change in entropy.

The equation TdS=dH-Vdp

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

The rate at which entropy is transferred out must ____ the rate at which entropy enters the control volume.

Mass and energy are conserved quantities, but entropy is generally not conserved.

The rate of entropy increase of the control volume ____ or ____ the net rate of entropy transfer to it.

In an open system, there is a transfer of which of the following quantity?

If the path A causes more entropy generation than path B, then

Any thermodynamic process is accompanied by entropy generation

The amount of entropy generation is given by

Lost work is given by