chemical engineering mechanical operations MCQs – Page 16

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 Review each marked answer and report any item that may be outdated or unclear.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
301. The value of angle of nip is generally about__________________?
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A. 32

B. 16

C. 64

D. 52

302. The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the _____________ of the belt?
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A. Speed

B. None of these

C. Length

D. Thickness

303. __________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc?
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A. Flight

B. Screw

C. Belt

D. Drag

304. Work index is defined as the_________________?
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A. ses a 200 mesh screen

B. Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of

C. product passes through a 100 micron screen</strong>

D. Energy needed to crush one tonne of feed to 200 microns

E. Energy needed to crush one ton of feed to 100 microns

F. Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product

305. 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 ? 1/NRe

C. Np ? constant

D. Np ? ?NRe

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

B. Compartment mills

C. Jaw crushers

D. Ball mills

307. Ficks law relates to_________________?
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A. Energy consumption

B. None of these

C. Feed size

D. Final particle size

308. Ore concentration by jigging is based on the difference in the ______________ of the particles?
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A. Specific gravities

B. Shape

C. Wettability

D. None of these

309. Colloid mills achieve size reduction mainly by___________________?
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A. Cutting

B. Attrition

C. Compression

D. Impact

310. The inlet pressure in a constant rate filtration____________________?
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A. Remains constant

B. Increases continuously

C. None of these

D. Decreases gradually

311. Pick out the wrong statement?
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A. Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement industries

B. Size enlargement is a mechanical operation exemplified by medicinal tablet making

C. Close circuit grinding is more economical than open circuit grinding

D. The equipment used for the removal of traces of solids from a liquid is called a classifier
312. Pick out the correct statement?
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A. Pine oil is used as a modifying agent (for activating or depressing the adsorption of filming

B. nts) in froth floatation process

C. Angle of repose is always greater than the angle of slide

D. ter coal

E. A hopper is a small bin with a sloping bottom

F. A silo is a short height vessel of very large diameter used for the storage of high volatile

313. Jigging is a technique by which different particles can be____________________?
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A. Mixed

B. Separated by particle size

C. Separated by particle density

D. Separated by particle shape

314. The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant ______________ filtration?
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A. Rate

B. Pressure

C. Both A. & B.

D. Neither A. nor B.

315. For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is__________________?
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A. 1125

B. 460

C. 2250

D. 230
316. Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill.) ?
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A. D

B. 1/D

C. D2.5

D. 1/D2.5

317. Coal is finally pulverised to 200 mesh size for burning in boilers by a___________________?
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A. Roll crusher

B. Gyratory crusher

C. Ball mill

D. Hammer crusher

318. Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of scrappers? ?
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A. Bucket conveyor

B. Flight conveyor

C. Screw conveyor

D. Both B. and C.
319. Which of the following is a batch sedimentation equipment ?
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A. Dust catcher

B. Rotary sprayer scrubber

C. Dry cyclone separator

D. Filter thickener
320. 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. m . Vp/?

B. Vp/m . ?

C. m/? . Vp

D. m . ?/Vp