Lakshya Education MCQs

Question: With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge
C.Remains constant
D.Increases linearly
Answer: Option A

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More Questions on This Topic :

Question 1. Chance process is used for the
  1.    Cleaning of coal
  2.    Concentration of iron ore
  3.    Concentration of pyrites
  4.    Water treatment
Answer: Option A
Question 2. What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls?
  1.    0.5
  2.    1.0
  3.    2.76
  4.    0.66
Answer: Option D
Question 3. Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.
  1.    < 5
  2.    10 to 25
  3.    < 74
  4.    > 1000
Answer: Option C
Question 4. Weber number is significant and is concerned with the
  1.    Solid-liquid mixing
  2.    Liquid-liquid mixing
  3.    Dispersion of liquid in liquid
  4.    Suspension of solid in liquid
Answer: Option C
Question 5. In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.
  1.    Concentrate
  2.    Tailing
  3.    Middling
  4.    None of these
Answer: Option C
Question 6. Helical screw agitator is used for
  1.    Mixing highly viscous pastes
  2.    Blending immiscible liquids
  3.    Mixing liquids at very high temperature (> 250 °C)
  4.    None of these
Answer: Option A

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