chemical engineering MCQs – Page 127

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 Review each marked answer and report any item that may be outdated or unclear.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
2521. Hot, lumpy & abrasive materials are best transported by using a/an ___________ conveyor ?
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A. Apron

B. Flight

C. Belt

D. Screw

2522. Which of the following is a batch sedimentation equipment ?
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A. Dust catcher

B. Filter thickener

C. Rotary sprayer scrubber

D. Dry cyclone separator

2523. All resistances during washing of cake _____________________?
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A. None of these

B. Increases

C. Remain constant

D. Decreases

2524. Fibrous material is broken by a__________________?
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A. Tube mill

B. Squirrel-cage disintegrator

C. Ball mill

D. Roll-crusher

2525. Compressibility co-efficient for an absolutely compressible cake is_______________?
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A. 0

B. 0 to 1

C. 1

D. ?

2526. Mesh indicates the number of holes per_________________?
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A. Square inch

B. Square foot

C. Linear inch

D. Linear foot

2527. The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is_________________?
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A. 1

B. None of these

C. 1.5

D. ?2

2528. Helical screw agitator is used for________________?
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A. None of these

B. Mixing liquids at very high temperature (> 250 C)

C. Mixing highly viscous pastes

D. Blending immiscible liquids

2529. Grinding characteristic of a material is given by its___________________?
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A. Shatter index

B. HGI

C. Angle of repose

D. Abrasion index

2530. Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ?= density of particles) ?
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A. Vp/m . ?

B. m . ?/Vp

C. m . Vp/?

D. m/? . Vp
2531. B.E.T. method can be used to determine the ___________________ of a porous catalyst?
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A. All A., B. and C.

B. Solid density

C. Pore volume

D. Surface area
2532. ____________ conveyor is the most suitable for long distance transportation of cold, nonabrasive granular/irregular shape/fine materials?
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A. Apron

B. Bucket

C. Screw

D. Belt
2533. Use of baffles in agitators help in minimising the ______________ tendency?
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A. Swirling

B. Vortexing

C. Both A. & B.

D. Neither A. nor B.

2534. The study on washability of coal is done by using the _____________ technique?
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A. Heavy media separation

B. Tabling

C. Elutriation

D. None of these

2535. A tube mill compared to a ball mill__________________?
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A. Produces a coarser product

B. Has a higher length/diameter ratio

C. Uses much larger balls

D. Has a higher diameter/length ratio

2536. For a turbine agitated and baffled tank, operating at low Reynolds number (based on impeller diameter), the power number (Np) varies with NRe as_________________?
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A. Np ? NRe

B. Np ? constant

C. Np ? ?NRe

D. Np ? 1/NRe
2537. ______________ mean diameter of particles is given by ? (xi/Dpi ?)?
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A. Mass

B. Arithmetic

C. Volume

D. Volume surface

2538. Basic slag is not ground in_________________?
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A. Tube mills

B. Ball mills

C. Compartment mills

D. Jaw crushers
2539. Cartridge filters are termed as edge filters, because of the fact that the_________________?
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A. Disks have very sharp edge

B. Bulk of the solids are removed at the periphery of the disks

C. None of these

D. Solids are not deposited at the edge of the disk

2540. ______________________ balls capable of grinding the feed in a ball mill gives the maximum efficiency ?
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A. Cast iron

B. Minimum size

C. Maximum size

D. Elliptical