chemical engineering MCQs – Page 138

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 Review each marked answer and report any item that may be outdated or unclear.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
2741. In bag filters, filter fabrics are never made of__________________?
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A. Metallic wire woven mesh

B. Polyester fibres

C. Cotton fibres

D. Nylon fibres

2742. Filter medium resistance is important during the ______________ of filtration?
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A. Early stages

B. None of these

C. Final stages

D. Entire process

2743. The process opposite to dispersion is termed as the___________________?
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A. Flocculation

B. Filtration

C. None of these

D. Sedimentation

2744. The capacity of a classifier in tons of solid/hr is given by (where, A = cross-sectional area in m2, V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ? = density of solids in kg/m3)_________________?
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A. 3.6 A.S. ?

B. 3.6 AVS/?

C. 3.6 A.V.?

D. 3.6 AVS.?

E. wer: Option

2745. Which of the following is a pressure filter ?
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A. Rotary drum filter

B. Plate and flame filter

C. Leaf filter (Moore filter)

D. Sand filter

2746. Choke crushing (in case of a Jaw crusher) compared to free crushing__________________?
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A. Results in increased capacity

B. Consumes less power

C. Consumes more power

D. Both A. and C.

2747. In an exothermic reaction, the energy of the reacting substances as compared to that of products is____________________?
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A. Either A. or B., depends on order of reaction

B. More

C. Less

D. Same

2748. Vibrating screens have capacity in the range of ______________ tons/ft2 .mm mesh size?
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A. 5 to 25

B. 100 to 250

C. 50 to 100

D. 0.2 to 0.8
2749. The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is ?
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A. Data insufficient to calculate

B. 0.425

C. 0.5

D. 0.875
2750. In the fluid catalytic cracker (FCC), the cracking reaction is _____________ (i) and the regeneration is _______________ (ii) _______________?
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A. (i) endothermic (ii) endothermic

B. (i) exothermic (ii) exothermic

C. (i) exothermic (ii) endothermic

D. (i) endothermic (ii) exothermic
2751. The exit age distribution curve E(t) for an ideal CSTR with the average residence time, ?, is given by__________________?
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A. 1 e-t/?

B. e-t/?

C. 1 (e-t/?/?)

D. e-t/?/?
2752. What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction ?
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A. 3

B. 0

C. 1

D. 2

2753. The rate at which a chemical substance reacts is proportional to its____________________?
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A. None of these

B. Equivalent weight

C. Active mass

D. Molecular weight

2754. The exit age distribution of a fluid leaving a vessel (denoted by E) is used to study the extent of non-ideal flow in the vessel. The value of ?? 0 E.dt is____________________?
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A. ?2?

B. 0

C. 1

D. ?

2755. Rate constant k and absolute temperature T are related by collision theory (for bimolecular) as______________________?
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A. k ? T1.5

B. k ? ?T

C. k ? T

D. k ? exp(-E/RT)

2756. In case of a P.F.R., there__________________________?
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A. May be lateral mixing of fluid

B. Should not be any mixing along the flow path

C. Both A. and B.

D. Neither A. nor B.

2757. For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ________________ is the controlling resistance?
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A. Diffusion through ash layer

B. Film diffusion

C. Either A., B. or C.

D. Chemical reaction
2758. Collision theory gives the rate constant for bimolecular reaction as___________________?
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A. K ? e-E/RT

B. K ? ?T.e-E/RT

C. None of these

D. K ? eE/RT

2759. The sequence in which three CSTRs of volumes 5, 10 and 15 m3 will be connected in series to obtain the maximum production in a second order irreversible reaction is ____________________?
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A. 15, 10, 5

B. 10, 5, 15

C. 5, 10, 15

D. 10, 15, 5

2760. The rate of a homogeneous reaction is a function of__________________?
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A. Temperature and composition only

B. All temperature, pressure and composition

C. Temperature and pressure only

D. Pressure and composition only