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MCQs

Total Questions : 2215 | Page 7 of 222 pages
Question 61. Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the
  1.    Density separation
  2.    Differential wettability
  3.    Size
  4.    Volatile matter content
 Discuss Question
Answer: Option A. -> Density separation
Question 62. Which of the following is the most suitable for handling fibrous and dense slurries?
  1.    Propeller agitator
  2.    Cone type agitator
  3.    Turbine agitator
  4.    Radial propeller agitator
 Discuss Question
Answer: Option B. -> Cone type agitator
Question 63. For efficient grinding, ball mills must be operated
  1.    At a speed less than the critical speed
  2.    At a speed more than the critical speed
  3.    At a speed equal to the critical speed
  4.    With minimum possible small balls
 Discuss Question
Answer: Option A. -> At a speed less than the critical speed
Question 64. Rittinger's crushing law states that
  1.    Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product
  2.    Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product
  3.    Work required in crushing is proportional to the new surface created
  4.    For a given machine and feed, crushing efficiency is dependent on the size of the feed & product
 Discuss Question
Answer: Option C. -> Work required in crushing is proportional to the new surface created
Question 65. Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.
  1.    1.0
  2.    0.5
  3.    1.34
  4.    4.34
 Discuss Question
Answer: Option C. -> 1.34
Question 66. The value of 'angle of nip' is generally about
  1.    16°
  2.    32°
  3.    52°
  4.    64°
 Discuss Question
Answer: Option B. -> 32°
Question 67. A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.
  1.    Compartment
  2.    Tube
  3.    Rod
  4.    Pebble
 Discuss Question
Answer: Option A. -> Compartment
Question 68. What is the selectivity index, if the grade of tailings & concentrate is the same?
  1.    0
  2.    ∞
  3.    1
  4.    0.5
 Discuss Question
Answer: Option C. -> 1
Question 69. Sphericity of raschig ring (whose length and diameter are equal) is
  1.    >1
  2.    1
  3.    2
 Discuss Question
Answer: Option C. -> 1
Question 70. During size reduction by a jaw crusher, the energy consumed decreases with the
  1.    Decreasing size of product at constant size of feed
  2.    Decreasing machine capacity
  3.    Increasing size of feed at constant reduction ratio
  4.    None of these
 Discuss Question
Answer: Option C. -> Increasing size of feed at constant reduction ratio

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