Chemical Engineering MCQs

6108 MCQs (Page 255 of 611)

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For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a__________________?

A. Buhrstone mill
B. Ball mill
C. Crushing rolls
D. Hammer mill

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For the preliminary breaking of hard rock, we use a____________________?

A. Gyratory crusher
B. Ball mill
C. Tube mill
D. Squirrel-cage disintegrator

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Jigging is a technique by which different particles can be____________________?

A. Separated by particle size
B. Separated by particle density
C. Separated by particle shape
D. Mixed

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_______________ mill is not used for grinding wheat into flour and for milling of cereals & other ?

VegEtable products.
A. Buhrstone
B. Roller
C. Attrition

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The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond’s law) of the energy to grind the particles from a very large size to 50 μm is________________?

A. 6.35 kwh/ton
B. 9.0 kwh/ton
C. 18 kwh/ton
D. 25.4 kwh/ton

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What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?

A. 0.5
B. 1.0
C. 2.76
D. 0.66

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According to Taggart’s rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than_______________?

A. 0.00184
B. 0.0184
C. 0.184
D. 1.84

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Wet sieving is employed, when the product contains ________________ materials?

A. Abrasive
B. Large quantity of very fine
C. Coarse
D. Non-sticky

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Size reduction mechanism used in Jaw crushers is__________________?

A. Attrition
B. Compression
C. Cutting
D. Impact

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Solid particles separation based on the difference in their flow velocities through fluids is termed as the__________________?

A. Clarification
B. Classification
C. Elutriation
D. Sedimentation

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