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MCQs

Total Questions : 2215 | Page 220 of 222 pages
Question 2191.
Close circuit grinding by a ball mill with air sweeping employs a _______________________?
  1.    Classifier
  2.    Cyclone separator between mill & classifier
  3.    Both A. & B.
  4.    Neither A. nor B.
 Discuss Question
Answer: Option C. -> Both A. & B.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2192. Trommels separate a mixture of particles depending on their_____________________?
  1.    Size
  2.    Density
  3.    Wettability
  4.    Electrical & magnetic properties
 Discuss Question
Answer: Option A. -> Size
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2193. The inlet pressure in a constant rate filtration____________________?
  1.    Increases continuously
  2.    Decreases gradually
  3.    Remains constant
  4.    None of these
 Discuss Question
Answer: Option A. -> Increases continuously
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2194. For spheres, volume shape factor is given by____________________?
  1.    π = (A/D2)
  2.    2π = (2A/D2)
  3.    π/6 = (V/D3)
  4.    AD/V
 Discuss Question
Answer: Option C. -> π/6 = (V/D3)
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2195. In bag filters, filter fabrics are never made of__________________?
  1.    Metallic wire woven mesh
  2.    Polyester fibres
  3.    Cotton fibres
  4.    Nylon fibres
 Discuss Question
Answer: Option A. -> Metallic wire woven mesh
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2196. Grizzlies are used for separating _____________ solids?
  1.    Coarse
  2.    Fine
  3.    Any size
  4.    None of these
 Discuss Question
Answer: Option B. -> Fine
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2197. In closed circuit grinding as compared to open circuit grinding, the_________________?
  1.    Specific surface of product is more
  2.    Product has lesser size uniformity
  3.    Production rate at a given limiting size is lower
  4.    Operation is economical
 Discuss Question
Answer: Option D. -> Operation is economical
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2198. 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2199. 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2200. For crushing of solids, the Rittinger’s law states that the work required for crushing is proportional to __________________?
  1.    The new surface created
  2.    The size reduction ratio
  3.    The change in volume due to crushing
  4.    None of these
 Discuss Question
Answer: Option A. -> The new surface created
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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