chemical engineering MCQs – Page 413

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 Review each marked answer and report any item that may be outdated or unclear.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

8241. Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the__________________?
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A. Two temperatures only

B. Pressure of working fluid

C. Mass of the working fluid

D. Mass and pressure both of the working fluid

8242. During a reversible isothermal expansion of an ideal gas, the entropy change is___________________?
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A. +ve

B. ?

C. #NAME?

D. 0

8243. The ammonia synthesis reaction represented by N2 + 3H2 ? 2NH3; ?H = 22.4 kcal, is__________________?
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A. Isothermal

B. Endothermic

C. Adiabatic

D. Exothermic

8244. In the equation, PVn = constant, if the value of n = ?, then it represents a reversible _____________ process?
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A. Adiabatic

B. Isothermal

C. Isentropic

D. Isometric

8245. Melting of ice exemplifies a/an______________________?
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A. Exothermic reaction

B. Adiabatic process

C. Endothermic reaction

D. Process involving a chemical reaction

8246. With increase in compression ratio, the efficiency of the otto engine________________?
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A. Increases linearly

B. Remain constant

C. Decreases

D. Increases

8247. While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is _______________?
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A. Unity

B. Infinity

C. Constant

D. Negative

8248. Isobaric process means a constant process ?
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A. Entropy

B. Pressure

C. Volume

D. Temperature

8249. Pick out the wrong statement_________________?
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A. Phase rule variables are intensive properties

B. Heat and work are both state function

C. The work done by expansion of a gas in vacuum is zero

D. CP and CV are state function

8250. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?
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A. Isobaric

B. Isothermal

C. Adiabatic

D. None of these

8251. The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is__________________?
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A. Less

B. Same

C. More

D. Dependent on climatic conditions

8252. High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ?H and ?S respectively for this process ?
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A. ? H = 0 and ?S = 0

B. ? H ? 0 and ?S ? 0

C. ? H = 0 and ?S ? 0

D. ? H ? 0 and ?S = 0

8253. When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is__________________?
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A. More in vapour phase

B. More in liquid phase

C. Same in both the phases

D. Replaced by chemical potential which is more in vapour phase

8254. During a reversible isothermal expansion of an ideal gas, the entropy change is_________________?
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A. #NAME?

B. 0

C. ?

D. +ve

8255. Joule-Thomson co-efficient which is defined as, ? = (?T/?P)H = 1/Cp (?H/?T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is ___________________?
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A. #NAME?

B. #NAME?

C. 0

D. ?

8256. In case of the decomposition of hydroiodic acid (2HI ? H2 + I2), addition of H2 (at equilibrium condition) will__________________?
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A. Increase the partial pressure of I2

B. Diminish the degree of dissociation of HI

C. Decrease the partial pressure of HI

D. None of these

8257. Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor ?
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A. dp/dt = Hvap/RT2

B. d ln p/dt = Hvap/RT2

C. dp/dt = RT2/Hvap

D. d ln p/dt = RT2/Hvap

8258. The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by____________________?
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A. (?H/R) (1/T1 1/T2)

B. (R/?H) (1/T1 1/T2)

C. (1/R) (1/T1 1/T2)

D. (?H/R) (1/T2 1/T1)

8259. Gibbs-Helmholtz equation is__________________?
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A. ?F = ?H T?T

B. dP/dT = ?Hvap/T.?Vvap

C. ?F = ?H + T [?(?F)/?T]P

D. d(E TS) T, V < 0

8260. Dry ice is________________?
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A. Moisture free ice

B. None of these

C. Solid helium

D. Solid carbon dioxide

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