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MCQs

Total Questions : 2215 | Page 5 of 222 pages
Question 41. Gold ore concentration is mostly done using
  1.    Jigging
  2.    Tabling
  3.    Froth floatation
  4.    Elutriation
 Discuss Question
Answer: Option B. -> Tabling
Question 42. Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its
  1.    Easier grindability
  2.    Poor grindability
  3.    High power consumption in grinding
  4.    None of these
 Discuss Question
Answer: Option A. -> Easier grindability
Question 43. Which of the following clay mixing devices is vacuum operated for deairation of clay?
  1.    Banbery mixer
  2.    Pug mill
  3.    Muller-mixer
  4.    None of these
 Discuss Question
Answer: Option B. -> Pug mill
Question 44. Pick out the correct statement:
  1.    Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products
  2.    The operating cost of shaking screen is more than that of a vibrating screen
  3.    Screen capacity does not depend upon the specific gravity of the minerals
  4.    Asphalt is best crushed using toothed roll crusher
 Discuss Question
Answer: Option A. -> Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products
Question 45. Grindability of a material does not depend upon its
  1.    Elasticity
  2.    Hardness
  3.    Toughness
  4.    Size
 Discuss Question
Answer: Option D. -> Size
Question 46. __________ baffles are provided in ball mills.
  1.    Horizontal
  2.    No
  3.    Only two
  4.    None of these
 Discuss Question
Answer: Option A. -> Horizontal
Question 47. Crushing efficiency of a machine ranges between __________ percent.
  1.    0.1 to 2
  2.    5 to 10
  3.    20 to 25
  4.    50 to 70
 Discuss Question
Answer: Option A. -> 0.1 to 2
Question 48. 200 mesh seive size corresponds to __________ microns.
  1.    24
  2.    74
  3.    154
  4.    200
 Discuss Question
Answer: Option B. -> 74
Question 49. The most suitable equipment for the transportation of 200 mesh size particles is a
  1.    Bucket elevator
  2.    Pneumatic conveyor
  3.    Screw conveyor
  4.    Belt conveyor
 Discuss Question
Answer: Option B. -> Pneumatic conveyor
Question 50. The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle).
  1.    6/D.p
  2.    2/D.p
  3.    4/D.p
  4.    12/D.p
 Discuss Question
Answer: Option A. -> 6/D.p

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