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MCQs

Total Questions : 2215 | Page 10 of 222 pages
Question 91. During agitation of liquids, the
  1.    Froude number is independent for the curves between power number and Reynolds number in baffled system
  2.    Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller
  3.    Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 92. Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is
  1.    Added to the feed slurry
  2.    Precoated on the filter medium prior to filtration
  3.    Separated from the cake by dissolving solids or by burning it off
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 93. According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively).
  1.    (S/V)p
  2.    √(S/V)p
  3.    (S/V)²p
  4.    (S/V)f
 Discuss Question
Answer: Option B. -> √(S/V)p
Question 94. Angle of nip of the crushing rolls does not depend upon the
  1.    Diameter of the rolls
  2.    Speed of the rolls
  3.    Product size
  4.    Feed size
 Discuss Question
Answer: Option B. -> Speed of the rolls
Question 95. The distribution given by microscopic analysis of powder is
  1.    Number
  2.    Length
  3.    Area
  4.    Volume
 Discuss Question
Answer: Option A. -> Number
Question 96. For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns.
  1.    5
  2.    50
  3.    500
  4.    5000
 Discuss Question
Answer: Option C. -> 500
Question 97. __________ conveyor is the most suitable for long distance transportation of cold, non-abrasive granular/irregular shape/fine materials.
  1.    Bucket
  2.    Belt
  3.    Screw
  4.    Apron
 Discuss Question
Answer: Option B. -> Belt
Question 98. Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)
  1.    3.6 V.W.Dr.ρ
  2.    3.6 V.W. ρ
  3.    3.6 W.Dr.ρ
  4.    3.6 V.W.Dr/ρ
 Discuss Question
Answer: Option A. -> 3.6 V.W.Dr.ρ
Question 99. Pick out the wrong statement pertaining to the roll crushers.
  1.    Maximum feed size determines the required roll diameter
  2.    For hard material's crushing, the reduction ratio should not exceed 4
  3.    Both the rolls run necessarily at the same speed
  4.    Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced
 Discuss Question
Answer: Option C. -> Both the rolls run necessarily at the same speed
Question 100. Dry powdery solid materials are transported by a __________ conveyor.
  1.    Belt
  2.    Bucket
  3.    Screw
  4.    None of these
 Discuss Question
Answer: Option C. -> Screw

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