chemical engineering mechanical operations MCQs – Page 20

Practise multiple-choice questions from chemical engineering mechanical operations for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering mechanical operations Mcqs
381. Hot, lumpy & abrasive materials are best transported by using a/an ___________ conveyor ?
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A. Screw

B. Apron

C. Belt

D. Flight

382. The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the__________________?
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A. Electro-static precipitator

B. Gravity settling chamber

C. Venturi atomiser

D. Cyclone separator

383. For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a__________________?
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A. Crushing rolls

B. Ball mill

C. Hammer mill

D. Buhrstone mill
384. Size reduction does not occur due to compression in case of________________?
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A. Jaw crushers

B. Rod mills

C. Smooth roll crushers

D. Gyratory crushers

385. Crushing efficiency of a machine ranges between __________________ percent?
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A. 0.1 to 2

B. 20 to 25

C. 5 to 10

D. 50 to 70

386. A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 ?m/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is_________________?
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A. 22.1 ?m/s

B. 1 ?m/s

C. 0.90 ?m/s

D. 0.02 ?m/s

387. The grinding in a hammer crusher takes place due to the_______________?
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A. Attrition

B. Impact

C. Both A. & B.

D. Neither A. nor B.

388. For classification of potable (drinking) water, we use a _______________ filter?
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A. Plate and frame

B. Gravity sand

C. Vacuum leaf

D. Rotary vacuum

389. Which of the following is the most suitable for handling fibrous and dense slurries ?
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A. Turbine agitator

B. Cone type agitator

C. Propeller agitator

D. Radial propeller agitator

390. In bag filters, filter fabrics are never made of__________________?
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A. Cotton fibres

B. Nylon fibres

C. Metallic wire woven mesh

D. Polyester fibres

391. ______________ mean diameter of particles is given by ? (xi/Dpi ?)?
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A. Volume surface

B. Volume

C. Arithmetic

D. Mass

392. Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher ?
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A. Rod mill

B. Ball mill

C. Fluid energy mill

D. Gyratory crusher
393. Weber number is significant and is concerned with the_________________?
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A. Solid-liquid mixing

B. Liquid-liquid mixing

C. Suspension of solid in liquid

D. Dispersion of liquid in liquid
394. Compressibility co-efficient for an absolutely compressible cake is_______________?
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A. 1

B. 0 to 1

C. ?

D. 0

395. _____________ mills are termed as disintegrators?
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A. Pebble

B. Cage

C. Compartment

D. All tumbling

396. The speed of a rotary drum vacuum filter may be about _____________ rpm?
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A. 500

B. 1

C. 100

D. 50

397. Screen capacity is not a function of__________________?
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A. Atmospheric humidity

B. Screening mechanism

C. Screening surface

D. Its openings size

398. Limestone is normally crushed in a _____________________?
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A. Ball mill

B. Hammer crusher

C. Roll crusher

D. Tube mill

399. Gelatinous solid (which plug the septum) can be filtered by a _____________ filter?
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A. Vacuum leaf

B. Pre-coat

C. Plate and frame

D. Sparkler

400. Trommels separate a mixture of particles depending on their_____________________?
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A. Electrical & magnetic properties

B. Density

C. Wettability

D. Size