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MCQs

Total Questions : 2215 | Page 4 of 222 pages
Question 31. Out of the following size reduction equipments, the maximum feed size can be accepted by the
  1.    Tube mill
  2.    Ball mill
  3.    Jaw crusher
  4.    Jet pulveriser
 Discuss Question
Answer: Option C. -> Jaw crusher
Question 32. The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).
  1.    Df/Dp
  2.    Dp/Df
  3.    Df - Dp
  4.    None of these
 Discuss Question
Answer: Option A. -> Df/Dp
Question 33. Crushing efficiency is the ratio of the
  1.    Surface energy created by crushing to the energy absorbed by the solid
  2.    Energy absorbed by the solid to that fed to the machine
  3.    Energy fed to the machine to the surface energy created by crushing
  4.    Energy absorbed by the solid to the surface energy created by crushing
 Discuss Question
Answer: Option A. -> Surface energy created by crushing to the energy absorbed by the solid
Question 34. With increase in the capacity of screens, the screen effectiveness
  1.    Remains unchanged
  2.    Increases
  3.    Decreases
  4.    Decreases exponentially
 Discuss Question
Answer: Option C. -> Decreases
Question 35. Dust laden air can be purified using a
  1.    Cyclone separator
  2.    Bag filter
  3.    Gravity settler
  4.    Tubular centrifuge
 Discuss Question
Answer: Option A. -> Cyclone separator
Question 36. A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is
  1.    0.50
  2.    0.58
  3.    0.68
  4.    0.62
 Discuss Question
Answer: Option A. -> 0.50
Question 37. Solid particles of different densities are separated by
  1.    Filters
  2.    Thickness
  3.    Cyclones
  4.    Sorting classifier
 Discuss Question
Answer: Option D. -> Sorting classifier
Question 38. Which of the following screens has the maximum capacity?
  1.    Grizzlies
  2.    Trommels
  3.    Shaking screen
  4.    Vibrating screen
 Discuss Question
Answer: Option D. -> Vibrating screen
Question 39. In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
  1.    35
  2.    50
  3.    70
  4.    85
 Discuss Question
Answer: Option B. -> 50
Question 40. For the transportation of ultrafine particles, the equipment used is a........conveyor.
  1.    Belt
  2.    Pneumatic
  3.    Screw
  4.    None of these
 Discuss Question
Answer: Option B. -> Pneumatic

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