chemical engineering mechanical operations MCQs – Page 8

Practise multiple-choice questions from chemical engineering mechanical operations for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering mechanical operations Mcqs

141. To remove dirt from the flowing fluid, we use a ____________________?
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A. Coagulant

B. Strains

C. Clarifier

D. Gravity settler

142. Mixing mechanism employed in a pan mixer is by ________________?
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A. Kneading

B. None of these

C. Dispersion

D. Mulling

143. There is practically no alternative/competitor to _________________ in the beneficiation treatment of sulphide ores?
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A. Jigging

B. Froth floatation

C. Tabling

D. Classification

144. As particle size is reduced__________________?
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A. Screening becomes progressively more difficult

B. Capacity and effectiveness of the screen is increased

C. Screening becomes progressively easier

D. None of these

145. Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ? = bulk density of material, kg/m3) ?
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A. 3.6 W.V.?

B. 3.6 W.D.V

C. 3.6 D.V.?

D. 3.6 W.D.V.?

146. Which of the following equations is Rittingers crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D? sa & D? sb = volume surface mean diameter of feed & product respectively) ?
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A. P/m = K/ ?Dp

B. None of these

C. P/m = K . (1/ D? sb 1/D? sa)

D. P/m = K . ln D? sa/D? sb

147. In constant pressure filtration ?
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A. Rate of filtration decreases with time

B. Rate of filtration is constant

C. Resistance decreases with time

D. Rate of filtration increases with time

148. The optimum moisture content in solids to be crushed/ground ranges from _______________ percent?
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A. 8 to 10

B. 15 to 20

C. 3 to 4

D. 10 to 15

149. Which of the following is not a wet classifier ?
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A. Sharpies super-centrifuge

B. None of these

C. Dorr Oliver rake classifier

D. Hydrocyclones

150. The specific surface of spherical particles is given by (where D and ? are diameter and density of particle) ?
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A. 12/D.?

B. 6/D.?

C. 4/D.?

D. 2/D.?

151. 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

152. Vacuum is applied in _______________ zone, in case of a general type continuous rotary drum vacuum filter?
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A. Filtering

B. All A., B. & C.

C. Drying

D. Washing

153. Which of the following is a pressure filter ?
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A. Sand filter

B. Plate and flame filter

C. Leaf filter (Moore filter)

D. Rotary drum filter

154. Size reduction of ice and gypsum can be accomplished suitably by a _______________ crusher?
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A. Toothed roll

B. Blake jaw

C. None of these

D. Gyratory

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

B. Gyratory crusher

C. Dodge jaw crusher

D. Blake jaw crusher

156. Size reduction of asbestos and mica is done by____________________?
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A. Crushing rolls

B. Rod mills

C. Hammer mills

D. Gyratory crushers

157. Which of the following mineral dressing operations is termed as comminution?
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A. None of these

B. Panning

C. Tabling

D. Spiralling

158. Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?
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A. None of these

B. Bonds crushing law

C. Rittingers law

D. Kicks law

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

B. cm-1

C. cm/gm-1

D. gm-1

160. 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. Light metal powder down upto 4 mesh size

B. Heavy tonnages of rocks or gravel

C. Dry chemicals

D. Powdered food & granular materials

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