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MCQs

Total Questions : 2215 | Page 18 of 222 pages
Question 171. Toothed roll crushers achieve size reduction by
  1.    Tearing (shear) and compression
  2.    Impact and attrition
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 172. Colloid mills achieve size reduction mainly by
  1.    Impact
  2.    Attrition
  3.    Cutting
  4.    Compression
 Discuss Question
Answer: Option B. -> Attrition
Question 173. Solid particles separation based on the difference in their flow velocities through fluids is termed as the
  1.    Clarification
  2.    Classification
  3.    Elutriation
  4.    Sedimentation
 Discuss Question
Answer: Option B. -> Classification
Question 174. Soft & non-abrasive materials can be made into fines by
  1.    Attrition
  2.    Compression
  3.    Cutting
  4.    None of these
 Discuss Question
Answer: Option A. -> Attrition
Question 175. Which of the following terminology is not used for size reduction of materials to fine sizes or powders?
  1.    Comminution
  2.    Dispersion
  3.    Pulverisation
  4.    Compression
 Discuss Question
Answer: Option D. -> Compression
Question 176. Fibrous material is broken by a
  1.    Rollcrusher
  2.    Squirrel-cage disintegrator
  3.    Ball mill
  4.    Tube mill
 Discuss Question
Answer: Option B. -> Squirrel-cage disintegrator
Question 177. Mesh indicates the number of holes per
  1.    Square inch
  2.    Linear inch
  3.    Square foot
  4.    Linear foot
 Discuss Question
Answer: Option B. -> Linear inch
Question 178. Jigging is a technique by which different particles can be
  1.    Separated by particle size
  2.    Separated by particle density
  3.    Separated by particle shape
  4.    Mixed
 Discuss Question
Answer: Option A. -> Separated by particle size
Question 179. Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation.
  1.    Clarification
  2.    Sedimentation
  3.    Flocculation
  4.    Classification
 Discuss Question
Answer: Option D. -> Classification
Question 180. Pick out the correct statement.
  1.    Angle of repose is always greater than the angle of slide
  2.    A hopper is a small bin with a sloping bottom
  3.    A silo is a short height vessel of very large diameter used for the storage of high volatile matter coal
  4.    Pine oil is used as a 'modifying agent' (for activating or depressing the adsorption of filming agents) in froth floatation process
 Discuss Question
Answer: Option B. -> A hopper is a small bin with a sloping bottom

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