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chemical engineering thermodynamics for chemical chemical engineering MCQs

Practise multiple-choice questions from chemical engineering thermodynamics for chemical chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering thermodynamics for chemical chemical engineering Mcqs

1. Cp Cv = R is valid for ______________ gases?
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A. Very high pressure

B. Very low temperature

C. Ideal

D. All of the above

2. During Joule-Thomson expansion of gases_________________?
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A. Entropy remains constant

B. Temperature remains constant

C. None of these

D. Enthalpy remains constant

3. If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in____________________?
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A. Volume

B. Enthalpy

C. Both A. & B

D. Neither A. nor B

4. In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13C and 37C respectively, the Carnot COP will be________________?
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A. 0.168

B. 5.2

C. 6.2

D. Data insufficient, cant be found out

5. The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition?
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A. Gibbs free energy

B. Enthalpy

C. Internal energy

D. Helmholtz free energy

6. The minimum number of phases that can exist in a system is________________?
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A. 2

B. 1

C. 3

D. 0

7. Fugacity and pressure are numerically not equal for the gases__________________?
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A. At low temperature and high pressure

B. At standard state

C. Both A. and B

D. In ideal state

8. Which of the following is Virial equation of state ?
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A. None of these

B. PV = A + B/V + C/V2 + D/V3 +

C. PV = nRT

D. (p + a/V2)(V b) = nRT

9. The equilibrium constant for a chemical reaction at two different temperatures is given by__________________?
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A. Kp2/Kp1 = (1/R) (1/T2 1/T1)

B. Kp2/Kp1 = (?H/R) (1/T2 1/T1)

C. Kp2/Kp1 = (?H/R) (1/T2 1/T1)

D. Kp2/Kp1 = ?H (1/T2 1/T1)

10. The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture. This is__________________?
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A. Henrys law

B. The statement as per Gibbs-Helmholtz

C. None of these

D. Called Lewis-Randall rule

11. Solid and liquid phases of a substance are in equilibrium at the____________________?
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A. Critical temperature

B. Melting point

C. Freezing point

D. Both B. and C

12. In an ideal solution, the activity of a component equals its __________________?
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A. Partial pressure

B. Fugacity at the same temperature and pressure

C. None of these

D. Mole fraction

13. Specific ____________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.)?
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A. Entropy

B. Internal energy

C. Enthalpy

D. Gibbs free energy

14. A refrigeration cycle is the same as a _____________ cycle?
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A. Heat engine

B. Turbine

C. None of these

D. Reversed heat engine

15. Troutons ratio of ______________ liquids is calculated using Kistyakowsky equation?
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A. Polar

B. Non-polar

C. Both A. & B

D. Neither A. nor B

16. The expression for entropy change given by, ?S = nR ln (V2/V1) + nCv ln (T2/T1) is valid for ______________________?
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A. Simultaneous heating and expansion of an ideal gas

B. Heating of a substance

C. Reversible isothermal volume change

D. Cooling of a substance

17. The energy of activation of exothermic reaction is_________________?
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A. Negative

B. Not possible to predict

C. Very large compared to that for endothermic reaction

D. Zero

18. The standard Gibbs free energy change of a reaction depends on the equilibrium______________________?
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A. Pressure

B. Temperature

C. All A, B. and C

D. Composition

19. Which of the following is not an extensive property ?
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A. None of these

B. Entropy

C. Free energy

D. Refractive index

20. 1m3 of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be ?
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A. 154 K

B. 274 K

C. 174 K

D. 35 K

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