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MCQs

Total Questions : 2215 | Page 11 of 222 pages
Question 101. Pick out the wrong statement.
  1.    Close circuit grinding is more economical than open circuit grinding
  2.    Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement 'industries'
  3.    The equipment used for the removal of traces of solids from a liquid is called a classifier
  4.    Size enlargement is a mechanical operation exemplified by medicinal tablet making
 Discuss Question
Answer: Option C. -> The equipment used for the removal of traces of solids from a liquid is called a classifier
Question 102. Horsepower required for a roll crusher is directly proportional to its
  1.    Reduction ratio
  2.    Capacity
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 103. Use of 'grinding aids' is done in __________ grinding.
  1.    Dry
  2.    Wet
  3.    Ultrafine
  4.    Intermediate
 Discuss Question
Answer: Option A. -> Dry
Question 104. The work index in Bond's law for crushing of solids has the following dimensions
  1.    No units (dimensionless)
  2.    KWh/ton
  3.    KW/ton
  4.    KWh.m1/2/ton
 Discuss Question
Answer: Option B. -> KWh/ton
Question 105. A screen is said to be blinded, when the
  1.    Oversizes are present in undersize fraction
  2.    Undersizes are retained in oversize fraction
  3.    Screen is plugged with solid particles
  4.    Screen capacity is abruptly increased
 Discuss Question
Answer: Option C. -> Screen is plugged with solid particles
Question 106. For raschig rings, the sphericity is
  1.    0.5
  2.    1
  3.    √3
 Discuss Question
Answer: Option C. -> Screen is plugged with solid particles
Question 107. Pick out the wrong statement.
  1.    Cummulative analysis for determining surface area is preferred over differential analysis, because of the assumption that "all particles in a simple fraction equal in size" is not needed for
  2.    A gate diagram is a plot of cummulative percent by weight undersize vs. the reciprocal of diameter, in which the area beneath the curve represents the surface
  3.    Capacity of crusher in choke feeding is increased
  4.    Rolling of pebbles/balls from top to bottom of the heap in tumbling mills is called 'cascading and throwing of the balls through the air to the toe of the heap is called 'cataracting'
 Discuss Question
Answer: Option C. -> Capacity of crusher in choke feeding is increased
Question 108. Screw conveyors are
  1.    Run at very high rpm
  2.    Suitable for sticky materials
  3.    Suitable for highly abrasive materials
  4.    All of the above
 Discuss Question
Answer: Option B. -> Suitable for sticky materials
Question 109. Screen efficiency is
  1.    Recovery/rejection
  2.    Recovery
  3.    Rejection
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 110. In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing.
  1.    Secondary
  2.    Fine
  3.    Primary
  4.    Ultrafine
 Discuss Question
Answer: Option C. -> Primary

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