chemical engineering mechanical operations MCQs – Page 22

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 Review each marked answer and report any item that may be outdated or unclear.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

421. Filter aid is used to____________________?
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A. Decrease the pressure drop

B. Increase the rate of filtration

C. Act as a support base for the septum

D. Increase the porosity of the cake

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

B. 0.2 to 0.8

C. 50 to 100

D. 100 to 250

423. Helical screw agitator is used for________________?
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A. Mixing liquids at very high temperature (> 250 C)

B. None of these

C. Blending immiscible liquids

D. Mixing highly viscous pastes

424. Horsepower required for a roll crusher is directly proportional to its__________________?
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A. Reduction ratio

B. Capacity

C. Both A. & B.

D. Neither A. nor B.

425. Size reduction mechanism used in Jaw crushers is__________________?
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A. Impact

B. Attrition

C. Compression

D. Cutting

426. Pick out the correct statement ?
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A. een, is called Work index

B. Plastic chips are called non-cohesive solids

C. Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh

D. Kicks crushing law is, P/m = K . ln (D? sa/D? sb)

E. Communition is a generic term for size enlargement operation

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

B. Maximum size

C. Minimum size

D. Elliptical

428. Screen efficiency is______________________?
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A. None of these

B. Recovery/rejection

C. Rejection

D. Recovery

429. Wet sieving is employed, when the product contains ________________ materials?
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A. Coarse

B. Large quantity of very fine

C. Non-sticky

D. Abrasive

430. _______________ mill is not used for grinding wheat into flour and for milling of cereals & other ?
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A. Pebble

B. etable products.

C. Buhrstone

D. Attrition

E. Roller

431. Shape factor for a cylinder whose length equals its diameter is_________________?
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A. 0.5

B. 2

C. 1

D. 1.5

432. In case of a plate and frame filter press, filtrate flow through the cake follows _______________ flow?
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A. Laminar

B. Plug

C. None of these

D. Turbulent

433. Handling of ashes and similar materials can be done best by a ______________ conveyor?
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A. Belt

B. Ribbon

C. Flight

D. Drag or slat

434. If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is ?s is defined by________________?
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A. ?s = Vp/dpsp

B. ?s = 6 Vp/dpsp

C. ?s = 6 dpSp/Vp

D. ?s = dpSp/Vp

435. _____________________ baffles are provided in ball mills ?
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A. Only two

B. Horizontal

C. None of these

D. No

436. Sedimentation on commercial scale occurs in____________________?
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A. Cyclones

B. Rotary drum filters

C. Thickeners

D. Classifiers

437. 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. wer: Option

C. 3.6 A.V.?

D. 3.6 AVS/?

E. 3.6 AVS.?

438. Reduction ratio of crushers is the___________________?
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A. Determining factor for minimum dia of the feed and the product

B. Ratio of discharge opening to feed opening

C. Ratio of feed opening to discharge opening

D. None of these

439. To remove very small amount of tiny solid impurities from liquid, we use a_____________________?
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A. Pressure filter

B. Coagulant

C. Centrifugal filter

D. Vacuum filter

440. Temperature of the product during ultrafine grinding_____________________?
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A. Remain constant

B. Increases

C. Decreases

D. May increase or decrease; depends on the material being ground

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