Maxwell relations are obtained from

exact differentials of thermodynamic potentials

Equilibrium phase rule F = C − P + 2 applies to

intensive degrees of freedom in heterogeneous equilibrium

Thermodynamics for Chemical Engineers MCQs 2026

5 questions with detailed answers · 3 from past papers · 1 quiz batches available

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Q1 Past Paper · PPSC/FPSC/CSS hard

Maxwell relations are obtained from
1. A Newton laws only
2. B Fourier law only
3. C exact differentials of thermodynamic potentials
4. D Darcy equation only
💡 Explanation:
Mixed partial derivatives of U,H,G,A.
Q2 Past Paper · PPSC/FPSC/CSS medium

For reversible adiabatic process, entropy change is
1. A always positive
2. B always negative
3. C equal to R
4. D zero
💡 Explanation:
Reversible adiabatic is isentropic.
Q3 hard

Joule-Thomson coefficient μJT is
1. A (∂P/∂T)_S
2. B (∂V/∂T)_P
3. C (∂H/∂T)_P
4. D (∂T/∂P)_H
💡 Explanation:
Temperature change during throttling at constant H.
Q4 Past Paper · PPSC/FPSC/CSS medium

Equilibrium phase rule F = C − P + 2 applies to
1. A only reactive systems without phases
2. B only single phase always
3. C only turbulent flow
4. D intensive degrees of freedom in heterogeneous equilibrium
💡 Explanation:
Gibbs phase rule.
Q5 hard

Residual properties account for
1. A only solid elasticity
2. B only pump cavitation
3. C deviation from ideal gas model
4. D only wind drag
💡 Explanation:
h^R and s^R from EOS.

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Thermodynamics for Chemical Engineers MCQs 2026

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