chemical engineering MCQs – Page 163

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 Review each marked answer and report any item that may be outdated or unclear.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
3241. consecutive reaction, as shown in the bellow figure, is characterised by __________________?
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A. High exothermicity

B. Maxima in the concentration of B

C. Maxima in the concentration of A

D. Maxima in the concentration of C

3242. Which parameter is used for the grading of paraffin waxes ?
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A. Penetration number

B. Viscosity

C. Melting point

D. Specific gravity

3243. Consider the n th order irreversible liquid phase reaction A ? B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot ?
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A. ln CA0 Vs ln t1/2

B. CA0 Vs ln t1/2

C. ln CA0 Vs t1/2

D. CA0 Vs t1/2

3244. A typical yield of diesel in straight run distillation of crude oil may be about ________________ percent?
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A. 18

B. 8

C. 28

D. 35

3245. When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only _______________ the true value?
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A. Twice

B. Half

C. None of these

D. Equal

3246. Which of the following is an autocatalytic reaction ?
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A. Microbial fermentation reaction

B. Ammonia synthesis reaction

C. Enzyme fermentation reaction

D. Photochemical reactions

3247. The unit of frequency factor in Arrhenius equation is_______________?
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A. None of these

B. Same as that of rate constant

C. Same as that of activation energy

D. Dimensionless

3248. A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length ?
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A. First increases and then decreases

B. Is at the highest allowable temperature throughout

C. Increases

D. Decreases

3249. Conversion increases with increase in temperature in case of a/an ______________ reaction?
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A. Reversible endothermic

B. Reversible exothermic

C. Autocatalytic

D. Irreversible

3250. The decomposition of A into B is represented by the exothermic reaction, A ? 2B. To achieve maximum decomposition, it is desirable to carry out the reaction ?
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A. At low P and low T

B. At high P and high T

C. At high P and low T

D. At low P and high T

3251. A good lubricant should have high _____________________ ?
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A. Pour point

B. Viscosity index

C. None of these

D. Volatility

3252. Road grade bitumen is produced from vacuum residue by its ____________________?
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A. Steam reforming

B. Pyrolysis

C. Hydrogenation

D. Aeration

3253. ______________ closure is the weakest enclosure for cylindrical vessels?
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A. Hemispherical

B. Elliptical

C. Torispherical

D. Conical or flat plate
3254. Research octane number refers to the___________________?
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A. Unleaded motor fuels

B. High octane number motor fuels

C. Low octane number motor fuels

D. High octane number aviation fuels

3255. Hydrofining is the most recent and effective method for the____________________ ?
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A. Reduction of breathing loss

B. Improvement of smoke point

C. Removal of sulphur

D. Improvement of viscosity index

3256. What is the value of q for saturated vapor feed to a distillation column? (where q = fraction of the feed stream that is liquid ?
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A. 1

B. 0

C. 1

3257. Aniline point is a property of the__________________?
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A. LPG

B. Naphtha

C. Diesel

D. Gasoline

3258. Which of the following fractions of a crude oil will have the maximum gravity API (i.e. API) ?
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A. Vacuum gas oil

B. Gasoline

C. Diesel

D. Atmospheric gas oil
3259. Which of the following is the most widely used cracking process in oil refineries ?
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A. Dubbs process

B. Fluidised bed catalytic cracking process

C. Houdrys fixed bed process

D. T.C.C. moving bed process

3260. Which one of the following processes aims at producing higher yield of gaseous unsaturated hydrocarbons and aromatics like benzene & toluene ?
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A. Alkylation

B. Reforming

C. Hydrocracking

D. Pyrolysis