Chemical Engineering Thermodynamics MCQs

Question 1

Gibbs free energy (F) is defined as

Accepted Answer

F = H - TS

Answer

F = E - TS

Answer

F = H + TS

Answer

F = E + TS

Question 2

A system is said to be at equilibrium, if the entropy of the system has reached __________ value.

Accepted Answer

Maximum

Answer

Minimum

Answer

Zero

Answer

None of these

Question 3

In the reaction, C + O2 → CO2; ΔH = -94 kcal. What is the heat content (enthalpy) of O2?

Accepted Answer

Zero

Answer

-94 kcal

Answer

> -94 kcal

Answer

< -94 kcal

Question 4

The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is

Accepted Answer

$${\left( {\frac{{\partial {	ext{S}}}}{{\partial {	ext{V}}}}} ight)_{	ext{T}}} = {\left( {\frac{{\partial {	ext{P}}}}{{\partial {	ext{T}}}}} ight)_{	ext{V}}}$$

Answer

$${\left( {\frac{{\partial {	ext{T}}}}{{\partial {	ext{V}}}}} ight)_{	ext{S}}} = - {\left( {\frac{{\partial {	ext{P}}}}{{\partial {	ext{S}}}}} ight)_{	ext{V}}}$$

Answer

$${\left( {\frac{{\partial {	ext{S}}}}{{\partial {	ext{P}}}}} ight)_{	ext{T}}} = - {\left( {\frac{{\partial {	ext{V}}}}{{\partial {	ext{T}}}}} ight)_{	ext{P}}}$$

Answer

$${\left( {\frac{{\partial {	ext{V}}}}{{\partial {	ext{S}}}}} ight)_{	ext{P}}} = {\left( {\frac{{\partial {	ext{T}}}}{{\partial {	ext{P}}}}} ight)_{	ext{S}}}$$

Question 5

Which of the following processes can not be made reversible even under ideal condition of operation?

Accepted Answer

Free expansion of a gas

Answer

Compression of air in a compressor

Answer

Expansion of steam in a turbine

Answer

All of the above

Question 6

Heat is added at constant pressure in an ideal __________ cycle.

Accepted Answer

Both B and C

Answer

Stirling

Answer

Brayton

Answer

Rankine

Question 7

Heat is added at constant temperature in an ideal __________ cycle.

Accepted Answer

Stirling

Answer

Brayton

Answer

Rankine

Answer

None of these

Question 8

The standard state of a gas (at a given temperature) is the state in which fugacity is equal to

Accepted Answer

Both A & B

Answer

Unity

Answer

Activity

Answer

Neither A nor B

Question 9

For a constant volume process __________ by the system is used only to increase the internal energy.

Accepted Answer

Heat absorbed

Answer

Work done

Answer

Both A & B

Answer

Neither A nor B