chemical engineering MCQs – Page 123

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 Review each marked answer and report any item that may be outdated or unclear.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
2441. increasing the capacity of a screen _______________ the screen effectiveness?
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A. Does not effect

B. None of these

C. Increases

D. Decreases
2442. Size reduction of moulding powders, waxes, resins & gums are done in a _______________ mill?
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A. Cage

B. Hammer

C. Both A. & B.

D. Neither A. nor B.

2443. The sphericity of a solid particle of cubical shape is ___________________?
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A. (?/6)1/2

B. ?

C. ?/3

D. (?/6)1/3
2444. Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ?
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A. 0.087 L.S

B. L.S/0.087

C. 0.01 L.S

D. L.S

2445. Trommels are revolving screens which normally operate in the range of _______________ rpm?
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A. 40 50

B. 1 2

C. 15 20

D. 60 75

2446. Filtration of water in a paper mill is done by a/an _______________ filter?
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A. Sparkler

B. Vacuum leaf

C. Plate and frame

D. Open sand
2447. Dispersion of a gas through liquid is done by using a__________________?
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A. Kneader

B. None of these

C. Masticator

D. Sparger
2448. Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the _____________ filtration?
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A. Varying rate

B. Constant rate

C. Constant pressure

D. Varying pressure

2449. Drying operation under vacuum is carried out to __________________?
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A. Dry those materials which have very high unbound moisture content

B. Dry materials having high bound moisture content

C. Increase drying temperature

D. Reduce drying temperature
2450. Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the ______________________?
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A. Ultimate strength of the material

B. State or manner of application of the crushing force

C. Elastic constant of the material

D. All A., B. and C.
2451. 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. Classification

B. Clarification

C. Sedimentation

D. Decantation

2452. General mechanism of size reduction in intermediate and fine grinder is by __________________?
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A. Compression and tearing

B. Compression

C. Impact and attrition

D. Cutting action

2453. Reciprocating screens are normally inclined at an angle of 5 with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the ___________________?
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A. Powdered food & granular materials

B. Heavy tonnages of rocks or gravel

C. Dry chemicals

D. Light metal powder down upto 4 mesh size

2454. The unit of filter medium resistance is________________?
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A. cm/gm-1

B. cm-1

C. gm-1

D. gm/cm-1

2455. For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of _______________ microns (1 mm = 1000 microns)?
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A. 5-Jan

B. 200-300

C. > 500

D. 10-60
2456. Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?
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A. Sand bed filter

B. Plate and frame filter press

C. Vacuum filter

D. Batch basket centrifuge

2457. Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is_________________?
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A. Unpredictable

B. Same

C. More

D. Less
2458. Wet grinding in a revolving mill ______________ as compared to dry grinding ?
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A. Complicates handling of the product

B. Gives less wear on chamber walls

C. Increases capacity

D. Requires more energy

2459. The drying time between fixed moisture contents within the constant rate period is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?
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A. T3

B. ?T

C. T

D. T1.5

2460. Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is ______________ microns?
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A. 10 to 25

B. < 5

C. < 74

D. > 1000