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MCQs

Total Questions : 2215 | Page 8 of 222 pages
Question 71. Filtration capacity of a rotary drum vacuum filter depends upon the
  1.    Cake thickness
  2.    Characteristics of the feed slurry
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 72. __________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals.
  1.    Separation efficiency
  2.    Selectivity index
  3.    Concentration ratio
  4.    None of these
 Discuss Question
Answer: Option B. -> Selectivity index
Question 73. Moisture can be removed from lubricating oil using
  1.    Tubular centrifuge
  2.    Clarifier
  3.    Sparkler filter
  4.    Vacuum leaf filter
 Discuss Question
Answer: Option A. -> Tubular centrifuge
Question 74. The capacity of a pneumatic conveying system depends upon the
  1.    Bulk density of materials
  2.    Pressure of the conveying air
  3.    Diameter of the conveying line
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 75. In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the
  1.    Square root of the velocity
  2.    Square of the viscosity
  3.    Filtration time only
  4.    Washing time only
 Discuss Question
Answer: Option A. -> Square root of the velocity
Question 76. For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is
  1.    2250
  2.    1125
  3.    460
  4.    230
 Discuss Question
Answer: Option D. -> 230
Question 77. Which one is a filter aid?
  1.    Convas fabric
  2.    Diatomaceous earth
  3.    Calcined lime
  4.    None of these
 Discuss Question
Answer: Option B. -> Diatomaceous earth
Question 78. Which of the following is not a cutting machine?
  1.    Dicers
  2.    Knife cutters
  3.    Slitters
  4.    Tube mills
 Discuss Question
Answer: Option D. -> Tube mills
Question 79. Pick out the wrong statement.
  1.    For the compressible cake, voidage & the specific resistance of the cake can be assumed to be constant
  2.    Cake resistance is independent of the pressure drop
  3.    Crushing of explosive materials are done by employing drygrinding
  4.    Gyratory crusher is a coarse crusher
 Discuss Question
Answer: Option B. -> Cake resistance is independent of the pressure drop
Question 80. Which of the following is not a wet classifier?
  1.    Sharpies supercentrifuge
  2.    Hydrocyclones
  3.    Dorr Oliver rake classifier
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these

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