chemical engineering MCQs – Page 419

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
8361. Gibbs-Duhem equation_____________________?
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A. States that n1d?1 + n2d?2 + .njd?j = 0, for a system of definite composition at constant

B. perature and pressure</strong>

C. Finds no application in gas-liquid equilibria involved in distillation

D. None of these

E. Applies only to binary systems

8362. For organic compounds, group contribution method can be used for the estimation of _____________________?
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A. Thermal conductivity

B. Specific gravity

C. Specific volume

D. Critical properties
8363. The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is_________________?
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A. Cv log10 4

B. R loge 4

C. R log10 4

D. Cv loge 4

8364. _____________ fuels require the maximum percentage of excess air for complete combustion ?
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A. Liquid

B. Gaseous

C. Nuclear

D. Solid
8365. The expression for entropy change given by, ?S = nR ln (P2/P1), holds good for___________________?
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A. Cooling of a real gas

B. Reversible isothermal volume change

C. Expansion of a real gas

D. Heating of an ideal gas

8366. Work done is a____________________?
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A. Property of the system

B. State description of a system

C. Point function

D. Path function
8367. When a gas in a vessel expands, its internal energy decreases. The process involved is________________?
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A. Reversible

B. Isothermal

C. Irreversible

D. Adiabatic

8368. The principle applied in liquefaction of gases is_____________________?
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A. Adiabatic expansion

B. Joule-Thomson effect

C. Both A. and B

D. Neither A. nor B

8369. As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine is_________________?
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A. Increasing

B. Not changed

C. Decreasing

D. Data sufficient, cant be predicted

8370. Which is not constant for an ideal gas ?
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A. (?V/?T)P

B. (?P/?V)V

C. All (A), B. & (C)

D. (?P/?V)T
8371. The necessary and sufficient condition for equilibrium between two phases is_________________?
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A. The chemical potential of each component should be same in the two phases

B. The pressure should be same in the two phases

C. The concentration of each component should be same in the two phases

D. The temperature of each phase should be same

8372. Isentropic process means a constant _____________________ process ?
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A. Enthalpy

B. Pressure

C. None of these

D. Entropy
8373. Entropy of the system decreases, when_______________?
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A. Snow melts into water

B. A gas expands spontaneously from high pressure to low pressure

C. Water is converted into ice

D. Both B. & C
8374. The temperature at which both liquid and gas phases are identical, is called the _____________ point?
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A. Triple

B. Freezing

C. Boiling

D. Critical
8375. The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the _____________ equation?
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A. Gibbs-Helmholtz

B. Margules

C. Gibbs-Duhem

D. Van Laar

8376. Entropy change of the reaction, H2O (liquid) ? H2O (gas), is termed as the enthalpy of___________________?
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A. Vaporisation

B. Sublimation

C. Solution

D. Formation

8377. 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is_________________?
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A. 0

B. ?

C. 8 J

D. 4 J

8378. Troutons ratio is given by (where ?b, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, K) ___________________?
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A. Tb/?b

B. ?(?b/Tb)

C. ?(Tb/?b)

D. ?b/Tb
8379. Which of the following processes cannot be made reversible even under ideal condition of operation ?
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A. Compression of air in a compressor

B. Expansion of steam in a turbine

C. All (A), B. & (C)

D. Free expansion of a gas
8380. Pick out the undesirable property for a good refrigerant ?
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A. High viscosity

B. Large latent heat of vaporisation

C. Low freezing point

D. High thermal conductivity