chemical engineering MCQs – Page 161

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 Review each marked answer and report any item that may be outdated or unclear.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

3201. The conversion in a mixed reactor/accomplishing a reaction A ? 3R is 50% when gaseous reactant A is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is _______________ second?
0

A. 2

B. 3

C. 0.5

D. 1

3202. The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called_________________?
0

A. A ferment or an enzyme

B. Fungi

C. Haemoglobin

D. None of these

3203. Radioactive decay follows ______________ order kinetics?
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A. First

B. Second

C. Zero

D. Third

3204. Good quality kerosene should have__________________?
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A. High aromatics content

B. High smoke point

C. Low paraffins content

D. Low smoke point

3205. The catalyst in a second order reversible reaction increases the rate of the forward reaction___________________?
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A. Only

B. To a greater extent than that of the backward reaction

C. And decreases that of backward reaction

D. And backward reaction equally

3206. The reason why a catalyst increases the rate of reaction is that, it______________?
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A. Increases the activation energy

B. Decreases the molecular collision diameter

C. None of these

D. Decreases the energy barrier for reaction

3207. Gum formation in stored gasoline is mainly due to the ____________________?
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A. Oxidation & polymerisation of unsaturated

B. Presence of sulphur

C. Alkylation of unsaturated

D. Higher aromatic content

3208. Salt content (measured as sodium chloride) in electrically desalted crude oil comes down to a level of about __________________ ptb (pounds per thousand barrel) ?
0

A. 70

B. 35

C. 0.03

D. 3

3209. A batch reactor is_______________?
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A. Suitable for gas-phase reactions on commercial scale

B. Least expensive to operate for a given rate

C. Suitable for liquid phase reactions involving small production rate

D. Most suitable for very large production rate

3210. The temperature dependence of reaction rate constant (K) by Arrhenius law is given by_______________?
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A. K ? ?T . e-E/RT

B. K ? eE/RT

C. K ? T . e-E/RT

D. K ? e-E/RT

3211. Which of the following is the most suitable for isothermal operation?
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A. Fixed bed reactor

B. Back-mix reactor

C. Batch reactor

D. Plug-flow reactor

3212. When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is__________________?
0

A. 1

B. > 1

C. < 1

D. 0

3213. A high space velocity means that a given__________________?
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A. Reaction can be accomplished with small reactor

B. Conversion can be obtained with a high feed rate

C. Both A. and B.

D. None of these

3214. Straight run naphtha is converted into high octane number petrol (gasoline) by catalytic____________________?
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A. Reforming

B. Polymerisation

C. Isomerisation

D. Cracking

3215. During manufacture of H2SO4, the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximised, if the _____________________?
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A. Temperature is increased and pressure is reduced

B. Temperature is reduced and pressure is increased

C. Pressure is reduced

D. Temperature is increased

3216. With decrease in temperature, the equilibrium conversion of a reversible endothermic reaction_________________?
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A. Increases

B. Remain unaffected

C. Increases linearly with temperature

D. Decreases

3217. Holding time for flow reactors is _______________ the space time, for constant fluid density ?
0

A. None of these

B. Double

C. Equal to

D. Triple

3218. Naphthenic acid is a/an ______________ compound?
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A. Sulphur

B. Nitrogen

C. Oxygen

D. None of these

3219. The rate at which a chemical substance reacts is proportional to its _____________________?
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A. Atomic weight

B. Active mass

C. Molecular weight

D. Equivalent weight

3220. If CA is the quantity of reactants initially present, the quantity left after n half periods will be equal to__________________?
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A. (CA/2)n

B. ()n CA

C. (CA)1/2n

D. (CA/2)1/n

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