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MCQs

Total Questions : 2215 | Page 25 of 222 pages
Question 241. Percentage of drum submerged in the slurry in case of rotary drum filter is
  1.    3
  2.    30
  3.    85
  4.    25
 Discuss Question
Answer: Option B. -> 30
Question 242. In froth floatation, chemical agent added to cause air adherence is called
  1.    Collector
  2.    Frother
  3.    Modifier
  4.    Activator
 Discuss Question
Answer: Option A. -> Collector
Question 243. In constant pressure filtration,
  1.    Resistance decreases with time
  2.    Rate of filtration is constant
  3.    Rate of filtration increases with time
  4.    Rate of filtration decreases with time
 Discuss Question
Answer: Option D. -> Rate of filtration decreases with time
Question 244. Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.
  1.    Metalliferrous ores
  2.    Non-metallic ores
  3.    Basic slags
  4.    Asbestos & mica
 Discuss Question
Answer: Option A. -> Metalliferrous ores
Question 245. In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).
  1.    Weber
  2.    Peclet
  3.    Brinkman
  4.    Schmidt
 Discuss Question
Answer: Option B. -> Peclet
Question 246. __________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution.
  1.    Tumbler
  2.    Banbery
  3.    Muller
  4.    Rubbon blender
 Discuss Question
Answer: Option B. -> Banbery
Question 247. Size reduction does not occur due to compression in case of
  1.    Rod mills
  2.    Gyratory crushers
  3.    Jaw crushers
  4.    Smooth roll crushers
 Discuss Question
Answer: Option A. -> Rod mills
Question 248. The process opposite to 'dispersion' is termed as the
  1.    Flocculation
  2.    Sedimentation
  3.    Filtration
  4.    None of these
 Discuss Question
Answer: Option A. -> Flocculation
Question 249. During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration
  1.    At time zero
  2.    At the end of filtration
  3.    When half the filtrate has been obtained
  4.    At the end of filtration, but decreases with time subsequently
 Discuss Question
Answer: Option B. -> At the end of filtration
Question 250. Mixing mechanism employed in a pan mixer is by
  1.    Mulling
  2.    Kneading
  3.    Dispersion
  4.    None of these
 Discuss Question
Answer: Option A. -> Mulling

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