chemical engineering MCQs – Page 124

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 Review each marked answer and report any item that may be outdated or unclear.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

2461. The specific cake resistance for incompressible sludges is (where ?P = pressure drop over cake)__________________?
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A. ? 1/ ?P

B. ? ??P

C. Independent of ?P

D. ? ?P

2462. Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________?
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A. Volatile matter content

B. Differential wettability

C. Density separation

D. Size

2463. Which of the following clay mixing devices is vacuum operated for deairation of clay ?
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A. Banbury mixer

B. Muller-mixer

C. Pug mill

D. None of these

2464. If a1 and a2 are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement ?
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A. a1 = 0.5 a2

B. a1 = a2

C. a1 = 2a2

D. None of these

2465. Soft & non-abrasive materials can be made into fines by________________________?
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A. Compression

B. None of these

C. Attrition

D. Cutting

2466. In case of a hammer crusher, the final product size depends on the____________________?
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A. Feed rate

B. All A., B. and C.

C. Clearance between hammer & grinding plates

D. Rotor speed

2467. Sphericity of pulverised coal is__________________?
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A. 1

B. ?

C. < 1

D. > 1

2468. Which of the following is a fine crusher ?
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A. Toothed roll crusher

B. Blake jaw crusher

C. Gyratory crusher

D. Dodge jaw crusher

2469. Use of grinding aids is done in _______________ grinding?
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A. Intermediate

B. Dry

C. Wet

D. Ultrafine

2470. Size reduction of asbestos and mica is done by____________________?
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A. Hammer mills

B. Rod mills

C. Gyratory crushers

D. Crushing rolls

2471. Cumulative analysis for determining surface is more precise than differential analysis, because of the_______________?
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A. Assumption that all particles in a single fraction are equal in size, is not needed

B. None of these

C. Fact that screening is more effective

D. Assumption that all particles in a single fraction are equal in size

2472. The energy consumed by a ball mill depends on__________________?
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A. Its speed

B. Its ball load

C. All A., B. and C.

D. The density of the material being ground

2473. Which of the following is not a wet classifier ?
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A. Hydrocyclones

B. Dorr Oliver rake classifier

C. Sharpies super-centrifuge

D. None of these

2474. Raw materials are charged in the iron blast furnace using____________________?
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A. Bucket elevator

B. Screw conveyor

C. None of these

D. Skip hoist

2475. Ion exchange process is similar to___________________?
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A. Extraction

B. Adsorption

C. Absorption

D. Leaching

2476. General crushing equation is given by d(P/m) = -K (dD? S/D? n S). Bonds crushing law is obtained by solving this equation for n = _____________ and feed of infinite size?
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A. 2

B. 2.5

C. 1.5

D. 1

2477. During agitation of liquids, power consumption during laminar flow is not proportional to the ________________?
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A. Density of the liquid

B. Viscosity of the liquid

C. Square of rotational speed

D. Cube of impeller diameters

2478. For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter D. as_________________?
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A. d

B. 1/d

C. d2

D. ?d

2479. The process by which fine solids is removed from liquids is termed as _____________________?
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A. Classification

B. Flocculation

C. Sedimentation

D. Decantation

2480. Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the _______________ number?
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A. Sherwood

B. Schmidt

C. Peclet

D. Stanton

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