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MCQs

Total Questions : 2215 | Page 20 of 222 pages
Question 191. Pick out the wrong statement pertaining to the turbine agitator.
  1.    Recommended peripheral speed for the turbine agitator is 200-250 metres/minute
  2.    Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow
  3.    Generally, the diameter of the agitator is kept between l/3rd to l/6th of the tank diameter while the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator diamete
  4.    Turbine agitator should be located at a height not less than one agitator diameter length from the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two agitators sh
 Discuss Question
Answer: Option B. -> Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow
Question 192. A gravity decanter is meant for the separation of two __________ density.
  1.    Immiscible liquids of different
  2.    Miscible liquids of different
  3.    Immiscible liquids of same
  4.    Miscible liquids of same
 Discuss Question
Answer: Option A. -> Immiscible liquids of different
Question 193. The reduction ratio for fine grinders is
  1.    5-10
  2.    10-20
  3.    20-40
  4.    As high as 100
 Discuss Question
Answer: Option D. -> As high as 100
Question 194. Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise)?
  1.    Propeller
  2.    Helical screw
  3.    Flat blade turbine
  4.    Curved blade turbine
 Discuss Question
Answer: Option B. -> Helical screw
Question 195. Addition of filter aid to the slurry before filtration is done to ...... of the cake.
  1.    Increase the porosity
  2.    Increase the compressibility co-efficient
  3.    Decrease the porosity
  4.    Decrease the compressibility co-efficient
 Discuss Question
Answer: Option A. -> Increase the porosity
Question 196. The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the __________ of the belt.
  1.    Speed
  2.    Thickness
  3.    Length
  4.    None of these
 Discuss Question
Answer: Option A. -> Speed
Question 197. Use of baffles in agitators help in minimising the __________ tendency.
  1.    Swirling
  2.    Vortexing
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 198. Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).
  1.    6.V/D.S
  2.    V/6D.S
  3.    D.S/V
  4.    V/D.S
 Discuss Question
Answer: Option A. -> 6.V/D.S
Question 199. Filter medium resistance is that offered by the
  1.    Filter cloth
  2.    Embedded particles in the septum
  3.    Filter cloth and the embedded particle collectively
  4.    None of these
 Discuss Question
Answer: Option C. -> Filter cloth and the embedded particle collectively
Question 200. Which of the following size reduction equipments employs mainly attrition for ultrafine grinding?
  1.    Jet mills
  2.    Fluid energy mill
  3.    Micronizer
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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