chemical engineering MCQs – Page 128

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 Review each marked answer and report any item that may be outdated or unclear.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
2541. _____________________ baffles are provided in ball mills ?
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A. Horizontal

B. No

C. Only two

D. None of these

2542. Which of the following is the softest material ?
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A. Corundum

B. Feldspar

C. Talc

D. Calcite

2543. A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________?
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A. 0.68

B. 0.62

C. 0.58

D. 0.50
2544. Which of the following can be most effectively used for clarification of lube oil and printing ink ?
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A. Sharpies super-centrifuge

B. Sparkler filter

C. Pre-coat filter

D. Disc-bowl centrifuge

2545. Which of the following mineral dressing operations is termed as comminution?
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A. Spiralling

B. Panning

C. Tabling

D. None of these
2546. Grindability of a material does not depend upon its_____________________?
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A. Size

B. Hardness

C. Toughness

D. Elasticity

2547. Screen capacity is not a function of__________________?
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A. Atmospheric humidity

B. Screening surface

C. Screening mechanism

D. Its openings size

2548. The work index in Bonds law for crushing of solids has the following dimensions__________________?
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A. kWh/ton

B. kWh.m1/2/ton

C. No units (dimensionless)

D. kW/ton

2549. Stamp mills are generally used for crushing__________________?
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A. Iron ores

B. Gold ores

C. Talc

D. Diamond

2550. In froth floatation, chemical agent added to cause air adherence is called___________________?
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A. Collector

B. Activator

C. Modifier

D. Frother

2551. Temperature of the product during ultrafine grinding_____________________?
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A. Decreases

B. Increases

C. Remain constant

D. May increase or decrease; depends on the material being ground

2552. Filtration rate does not depend upon the________________?
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A. Pressure drop & area of filtering surface

B. Properties of the cake & the filtrate

C. None of these

D. Resistance of the cake & the septum

2553. The unit of specific cake resistance is______________________?
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A. cm/gm

B. cm/gm2

C. gm/gm

D. gm/cm2
2554. Filter medium resistance is that offered by the__________________?
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A. Embedded particles in the septum

B. None of these

C. Filter cloth and the embedded particle collectively

D. Filter cloth

2555. Limestone is normally crushed in a _____________________?
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A. Hammer crusher

B. Ball mill

C. Tube mill

D. Roll crusher

2556. In a roll crusher, both the rolls_________________?
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A. Run either at the same or different speeds

B. Have the same diameter

C. Are rotated towards each other

D. All A., B. and C.
2557. If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is ?s is defined by________________?
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A. ?s = dpSp/Vp

B. ?s = 6 dpSp/Vp

C. ?s = Vp/dpsp

D. ?s = 6 Vp/dpsp
2558. The value of n for a chemical reaction A ? B, whose reaction rate is ? CA n, will be _______________ if the rate of the reaction increases by a factor of 8, when the concentration of is doubled?
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A. 3

B. 1

C. 0

D. 2

2559. Which of the following is a coarse crusher ?
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A. Toothed roll crusher

B. Smooth roll crusher

C. Gyratory crusher

D. Tube mill

2560. 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. 5

B. 5000

C. 50

D. 500