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MCQs

Total Questions : 2215 | Page 24 of 222 pages
Question 231. Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?
  1.    Rittinger's law
  2.    Kick's law
  3.    Bond's law
  4.    None of these
 Discuss Question
Answer: Option A. -> Rittinger's law
Question 232. Traces of solids are removed from, liquid in a
  1.    Classifier
  2.    Clarifier
  3.    Sparkler filter
  4.    Rotary vacuum filter
 Discuss Question
Answer: Option B. -> Clarifier
Question 233. __________ mills are termed as disintegrators.
  1.    Cage
  2.    Compartment
  3.    Pebble
  4.    All of the above
 Discuss Question
Answer: Option A. -> Cage
Question 234. Which of the following is not categorised as a "mechanical operation"?
  1.    Agitation
  2.    Filtration
  3.    Size enlargement
  4.    Humidification
 Discuss Question
Answer: Option D. -> Humidification
Question 235. Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is
  1.    0.5
  2.    1
  3.    √2
  4.    √3
 Discuss Question
Answer: Option B. -> 1
Question 236. Size measurement of ultrafine particles can be best expressed in terms of
  1.    Centimetre
  2.    Screen size
  3.    Micron
  4.    Surface area per unit mass
 Discuss Question
Answer: Option D. -> Surface area per unit mass
Question 237. Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the
  1.    State or manner of application of the crushing force
  2.    Ultimate strength of the material
  3.    Elastic constant of the material
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 238. Screen capacity is not a function of
  1.    Its openings size
  2.    Screening mechanism
  3.    Screening surface
  4.    Atmospheric humidity
 Discuss Question
Answer: Option D. -> Atmospheric humidity
Question 239. In case of a plate and frame filter press, filtrate flow through the cake follows __________ flow.
  1.    Plug
  2.    Turbulent
  3.    Laminar
  4.    None of these
 Discuss Question
Answer: Option C. -> Laminar
Question 240. In case of a hammer crusher, the
  1.    Feed may be highly abrasive (Moh's scale >5)
  2.    Minimum product size is 3 mm
  3.    Maximum feed size may be 50 mm
  4.    Rotor shaft carrying hammers can be vertical or horizontal
 Discuss Question
Answer: Option D. -> Rotor shaft carrying hammers can be vertical or horizontal

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