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MCQs

Total Questions : 2215 | Page 3 of 222 pages
Question 21. A tube mill compared to a ball mill
  1.    Has a higher length/diameter ratio
  2.    Produces a coarser product
  3.    Has a higher diameter/length ratio
  4.    Uses much larger balls
 Discuss Question
Answer: Option A. -> Has a higher length/diameter ratio
Question 22. __________ are mixed using ribbon blenders.
  1.    Lumpy solids and low viscosity liquids
  2.    Dry powders
  3.    High viscosity liquids
  4.    Thick pastes
 Discuss Question
Answer: Option B. -> Dry powders
Question 23. For benefication of iron ore, the most commonly used method is
  1.    Flocculation
  2.    Froth floatation
  3.    Jigging & tabling
  4.    None of these
 Discuss Question
Answer: Option C. -> Jigging & tabling
Question 24. For sizing of fine materials, the most suitable equipment is a
  1.    Trommel
  2.    Grizzly
  3.    Shaking screen
  4.    Vibrating screen
 Discuss Question
Answer: Option D. -> Vibrating screen
Question 25. Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a
  1.    Disc bowl centrifuge
  2.    Sharpies supercentrifuge
  3.    Batch basket centrifuge
  4.    Sparkler filter
 Discuss Question
Answer: Option A. -> Disc bowl centrifuge
Question 26. Grinding efficiency of a ball mill is of the order of __________ percent.
  1.    1-5
  2.    40-50
  3.    75-80
  4.    90-95
 Discuss Question
Answer: Option A. -> 1-5
Question 27. In filtration, the use of 'filter aid' helps in
  1.    Reducing the filtration pressure
  2.    Accelerating the rate of filtration
  3.    Deplugging the filter medium
  4.    Enhancing the cake porosity in case of a dense impermeable cake
 Discuss Question
Answer: Option C. -> Deplugging the filter medium
Question 28. Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )
  1.    D
  2.    1/D
  3.    D2.5
  4.    1/D2.5
 Discuss Question
Answer: Option C. -> D2.5
Question 29. In screen analysis, the notation +5 mm/-10 mm means particles passing through
  1.    10 mm screen and retained on 5 mm screen
  2.    5 mm screen and retained on 10 mm screen
  3.    Both 5 mm and 10 mm screens
  4.    Neither 5 mm nor 10 mm screen
 Discuss Question
Answer: Option A. -> 10 mm screen and retained on 5 mm screen
Question 30. Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
  1.    Kozney-Karman
  2.    Hagen-Poiseulle's
  3.    Fanning's
  4.    Kremser
 Discuss Question
Answer: Option A. -> Kozney-Karman

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