chemical engineering MCQs – Page 155

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 Review each marked answer and report any item that may be outdated or unclear.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
3081. Space time equals the mean residence time__________________?
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A. For large diameter tubular reactor

B. When the density of the reaction mixture is constant

C. For narrow diameter tubular reactor

D. For CSTR

3082. Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the ___________________?
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A. None of these

B. Activation energy

C. Equilibrium constant

D. Heat of reaction

3083. Half-life period for a first order reaction is _____________ the initial concentration of the reactant?
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A. Independent of

B. None of these

C. Inversely proportional to

D. Directly proportional to

3084. Pressure & temperature maintained in catalytic cracking is about__________________?
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A. 50 atm & 750C

B. 2 atm & 500C

C. 30 atm & 200C

D. 10 atm & 500C

3085. Which of the following is not a chemical step in a fluid solid catalytic reaction ?
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A. None of these

B. Desorption

C. Adsorption

D. Surface chemical reaction

3086. The single parameter model proposed for describing non-ideal flow is the ____________ model?
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A. Tank in series

B. Dispersion

C. Both A. & B.

D. Neither A. nor B.

3087. The rate of forward reaction, at chemical equilibrium is ______________ the rate of backward reaction?
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A. More than

B. Less than

C. Equal to

D. Either B. or C.

3088. For the liquid phase zero order irreversible reaction A ? B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min-1. What will be the conversion for a PFR with a space velocity of 0.2 min-1? Assume that all the other operating conditions are the same for CSTR and PFR ?
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A. 0.3

B. 0.60

C. 0.9

D. 0.15

3089. The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is________________________?
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A. Series of CSTR

B. Plug flow reactor

C. Backmix reactor

D. PFR in series

3090. Slurry reactors are characterised by the_________________?
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A. Lack of intraparticle diffusion resistance

B. Presence of two mobile phases

C. Both A. and B.

D. Neither A. nor B.

3091. LPG stands for ____________________?
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A. Liquefied petroleum gas

B. Liquid petroleum gas

C. Liquid petrol gas

D. Liquefied petrol gas

3092. Catalyst used in isomerisation process is __________________ ?
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A. HF

B. H2SO4

C. AlCl3

D. H3PO4

3093. Molecularity of a reaction__________________?
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A. Is always equal to the overall order of reaction

B. May not be equal to the order of reaction

C. Cant have a fractional value

D. Both B. and C.
3094. Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of ____________________?
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A. Discoloration

B. Thermal cracking

C. Gum formation

D. Coking
3095. The dimensions of rate constant for reaction 3A ? B are (l/gm mole)/min. Therefore the reaction order is______________________?
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A. 2

B. 3

C. 0

D. 1

3096. Sometimes, batch process is preferred over continuous process, when the product___________________?
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A. Quality & yield cannot be achieved in continuous processes, because of long residence time

B. Sales demand is fluctuating

C. Both A. & B.

D. Neither A. nor B.

3097. Tanks used for the storage of petroleum products (which are inflammable) should be painted with a ______________ paint?
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A. White

B. Yellow

C. Black

D. Red

3098. Exothermic reactions are best carried out in ________________?
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A. A plug flow reactor followed by CSTR

B. A CSTR

C. CSTR in series

D. CSTR followed by a plug flow reactor
3099. The characterisation factor of crude petroleum oil is around__________________?
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A. 22

B. 11

C. 28

D. 3

3100. Pick the WRONG design guideline for a reactor in which the reactions, A ? R (desired) and A ? S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k1/k2). CA a-b ?
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A. Use high pressure and eliminate inerts, when a > b

B. Use CSTR with a high conversion, when a > b

C. Use batch reactor or plug flow reactor, when a > b

D. Avoid recycle, when a > b