chemical engineering MCQs – Page 119

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 Review each marked answer and report any item that may be outdated or unclear.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
2361. In case of a revolving mill, wet grinding compared to dry grinding__________________?
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A. Complicates handling & classification of the product

B. None of these

C. Requires more energy

D. Has less capacity

2362. For absorbers, high pressure drop results in___________________?
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A. Increased efficiency

B. High operating cost

C. Better gas liquid contact

D. Decreased efficiency

2363. Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about________________?
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A. 5 to 10

B. 2 to 5

C. 10 to 15

D. 1 to 2

2364. Reciprocal of sphericity is termed as the________________?
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A. Shape factor

B. Specific surface ratio

C. Sauter diameter

D. Surface area per unit mass

2365. A filter press is___________________?
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A. Not suitable, if the liquid is the main product

B. Having prohibitively high maintenance cost

C. A batch filter

D. Not suitable for wide range of materials under varying operating conditions of cake thickness

E. pressure

2366. The controlling resistance in a rotary drum vacuum filter is the ________________ resistance?
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A. Cake

B. Filter medium

C. Piping

D. None of these

2367. For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter) ?
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A. None of these

B. ?/6 = (V/D3)

C. AD/V

D. ? = (A/D2)
2368. In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called _____________ is produced?
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A. Middling

B. Tailing

C. Concentrate

D. None of these

2369. Pick out the wrong statement ?
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A. uction equipments employ

B. versal jaw crushers

C. More commonly used jaw crusher between Dodge jaw crusher and Blake jaw crusher is the

D. Operating principles of Dodge and Blake jaw crushers are combined in the working of

E. Cutting machines mainly employ attrition for size reduction of solids

F. er one

2370. Refractory bricks are usually dried in a ________________ dryer?
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A. Tray

B. Tunnel

C. Festoon

D. Conveyor

2371. To get ultrafine particles, the equipment used is a _________________?
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A. Fluid energy mill

B. Ball mill

C. Hammer crusher

D. Rod mill

2372. Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for__________________?
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A. American standard screens (ASTM and Tyler standard screens)

B. All A., B. and C.

C. German standard screens (DIN 1171) etc

D. British standard screens

2373. 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.

2374. The specific surface of spherical particles is proportional to (where, Dp = diameter of particle)?
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A. Dp

B. D2

C. 1/Dp

D. 1/D2p

2375. Sticky material can be dried in a ________________ dryer ?
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A. Tray

B. Fluidised bed

C. None of these

D. Rotary

2376. Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripheral velocity, m/sec. W = width of rolls, m Dr = distance between rolls ? = density of material to be crushed, kg/m3 here, V =?ND where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m) ?
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A. 3.6 V.W.Dr.?

B. 3.6 V.W. ?

C. 3.6 W.Dr.?

D. 3.6 V.W.Dr/?

2377. Dry powdery solid materials are transported by a ______________ conveyor?
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A. Bucket

B. None of these

C. Screw

D. Belt

2378. Which is a secondary crusher for a hard & tough stone ?
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A. Cone crusher

B. Toothed roll crusher

C. Jaw crusher

D. Impact crusher

2379. The binary diffusivity in gases at atmospheric conditions is about ___________________?
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A. 10-4 cm2/sec2

B. 10-1 cm2/sec

C. 10-3 sec/cm

D. 10-9 cm/sec

2380. Size measurement of ultrafine particles can be best expressed in terms of___________________?
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A. Micron

B. Screen size

C. Centimetre

D. Surface area per unit mass