chemical engineering MCQs – Page 410

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 Review each marked answer and report any item that may be outdated or unclear.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
8181. Which of the following equations is used for the prediction of activity co-efficient from experiments ?
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A. Margules equation

B. All A, B. and C

C. Van Laar equation

D. Wilsons equation

8182. To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (?HV/R) (1/T1 1/T2) from the exact Clapeyron equation, it is assumed that the____________________?
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A. Volume of the liquid phase is negligible compared to that of vapour phase

B. Heat of vaporisation is independent of temperature

C. All A , B. & C.

D. Vapour phase behaves as an ideal gas

8183. The variation of heat of reaction with temperature at constant pressure is given by the ____________ law?
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A. Kirchoffs

B. Antoines

C. Kelvins

D. None of these

8184. A system is said to be at equilibrium, if the entropy of the system has reached ____________ value?
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A. Zero

B. None of these

C. Maximum

D. Minimum

8185. The adiabatic throttling process of a perfect gas is one of constant enthalpy_________________?
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A. Which can be performed in a pipe with a constriction

B. Which is exemplified by a non-steady flow expansion

C. In which there is an increase in temperature

D. In which there is a temperature drop

8186. For a reversible process involving only pressure-volume work____________________?
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A. (dF)T, p = 0

B. (dA)T, v < 0

C. (dF)T, p 0

8187. Water on heating from 1 to 4C___________________?
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A. Expands

B. Contracts

C. Has same volume

D. May contract or expand

8188. Heat of formation of an element in its standard state is___________________?
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A. 0

B. A function of pressure

C. 0
8189. In an ideal solution, the activity of a component equals its __________________?
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A. Partial pressure

B. Mole fraction

C. None of these

D. Fugacity at the same temperature and pressure

8190. Van Laar equation deals with the activity co-efficients in___________________?
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A. Binary solutions

B. None of these

C. Azeotropic mixture only

D. Ternary solutions

8191. On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (?P/?V)s and the slope of the reversible isothermal line (?P/?V)T are related as (where, y = Cp/Cv) ?
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A. (?P/?V)S = [(?P/?V)T]Y

B. (?P/?V)S = y(?P/?V)T

C. (?P/?V)S = (?P/?V)T

D. (?P/?V)S = 1/y(?P/?V)T

8192. Entropy change for an irreversible process taking system and surrounding together is___________________?
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A. None of these

B. < 0

C. > 0

D. 0

8193. At ____________ point, all the three phases (i.e. solid, liquid and gas) co-exist ?
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A. Triple

B. Plait

C. Eutectic

D. Critical

8194. Internal energy change of a system over one complete cycle in a cyclic process is__________________?
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A. #NAME?

B. Zero

C. #NAME?

D. Dependent on the path

8195. The expression, nRT ln(P1/P2), is for the _____________of an ideal gas?
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A. Work done under isothermal condition

B. Compressibility

C. Work done under adiabatic condition

D. Co-efficient of thermal expansion

8196. Pick out the correct equation relating F and A___________________?
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A. F = A + TS

B. F = A + PV

C. F = A TS

D. F = E + A

8197. Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the ____________ equation?
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A. Clapeyron

B. None of these

C. Maxwells

D. Gibbs-Duhem

8198. The equation, PV = nRT, is best obeyed by gases at____________________?
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A. Low pressure & high temperature

B. None of these

C. High pressure & low temperature

D. Low pressure & low temperature

8199. For equilibrium process (i.e. reversible) in an isolated system __________________?
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A. ds = Constant

B. ds = 0

C. ds 0

8200. In the decomposition of PCl5 represented by, PCl5 ? PCl3 + Cl2, decrease in the pressure of the system will _____________ the degree of dissociation of PCl5?
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A. None of these

B. Increase

C. Not alter

D. Decrease