chemical engineering mechanical operations MCQs – Page 12

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 Review each marked answer and report any item that may be outdated or unclear.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

221. Which of the following can be most effectively used for clarification of lube oil and printing ink ?
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A. Sparkler filter

B. Pre-coat filter

C. Disc-bowl centrifuge

D. Sharpies super-centrifuge

222. Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of ____________ mm?
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A. 0.014

B. 0.30

C. 50

D. 0.007

223. The important dimensional group involved in the power requirement calculation in mixing operation is the _____________ number?
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A. Reynolds

B. Froude

C. Both A. & B.

D. Neither A. nor B.

224. Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately?
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A. None of these

B. Rittingers law

C. Kicks law

D. Bonds law

225. 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. ?2

B. 1.5

C. None of these

D. 1

226. Vacuum filter is most suitable for the_______________?
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A. Liquids of very high viscosity

B. Liquids having high vapour pressure

C. None of these

D. Removal of fines from liquid

227. Wet grinding in a revolving mill ______________ as compared to dry grinding ?
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A. Gives less wear on chamber walls

B. Increases capacity

C. Requires more energy

D. Complicates handling of the product

228. Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a _____________ operation?
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A. Sedimentation

B. Clarification

C. Classification

D. Flocculation

229. Chance process is used for the________________?
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A. Concentration of pyrites

B. Concentration of iron ore

C. Water treatment

D. Cleaning of coal

230. Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is_____________________?
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A. 0.2 to 0.4

B. 0.01 to 0.1

C. 0.1 to 0.3

D. 0.2 to 0.8

231. Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called__________________?
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A. Sedimentation

B. Classification

C. Clarification

D. Decantation

232. _______________ is a cohesive solid ?
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A. Wheat

B. Sand

C. Wet clay

D. None of these

233. Which of the following is not an industrial screening equipment ?
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A. Vibrating screen

B. Grizzly

C. Sharpies centrifuge

D. Trommel

234. For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately _____________ microns?
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A. 500

B. 5

C. 50

D. 5000

235. Feed size of ? 25 cms can be accepted by _______________________?
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A. Fluid energy mill

B. Ball mill

C. Rod mill

D. Jaw crusher

236. In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the _____________ crushing?
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A. Ultrafine

B. Primary

C. Fine

D. Secondary

237. For sizing of fine materials, the most suitable equipment is a____________________?
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A. Grizzly

B. Trommel

C. Shaking screen

D. Vibrating screen

238. increasing the capacity of a screen _______________ the screen effectiveness?
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A. Increases

B. Decreases

C. Does not effect

D. None of these

239. The sphericity of a cylinder of 1 mm diameter and length 3 mm is_________________?
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A. 0.78

B. 0.6

C. 0.5

D. 0.9

240. A fluid energy mill is used for __________________?
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A. Grinding

B. Cutting

C. Ultra-grinding

D. Crushing

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