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  • Question

  • A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 ?m/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is


  • Options
  • A. 0.90 ?m/s
  • B. 1 ?m/s
  • C. 22.1 ?m/s
  • D. 0.02 ?m/s

  • Correct Answer
  • 1 ?m/s 

    • Mechanical Operations problems

    Search Results

    • 1. Grinding characteristic of a material is given by its

    • Options
    • A. HGI
    • B. angle of repose
    • C. shatter index
    • D. abrasion index.
      • Discuss
    • 2. In ball mill operation, the feed size (Df in meters) and the ball diameter (Db in metres) are related as ( where, K = grindability constant (varying from 0.9 to 1.4 in increasing order of hard ness))

    • Options
    • A. Db2 = K.Df
    • B. Db = K.Df
    • C. Db3 = K.Df
    • D. Db2 = K.Df2
      • Discuss
    • 3. __________ baffles are provided in ball mills.

    • Options
    • A. Horizontal
    • B. No
    • C. Only two
    • D. None of these
      • Discuss
    • 4. Handling of ashes and similar materials can be done best by a __________ conveyor.

    • Options
    • A. flight
    • B. drag or slat
    • C. belt
    • D. ribbon.
      • Discuss
    • 5. Which of the following must be stored in silos and not in open yard?

    • Options
    • A. Coke breeze
    • B. High V.M. bituminous coal
    • C. Sand
    • D. None of these
      • Discuss
    • 6. In froth floatation, chemical agent added to cause air adherence is called

    • Options
    • A. collector
    • B. frother
    • C. modifier
    • D. activator
      • Discuss
    • 7. Velocity of a small particle of diameter 'Dp' at a distance 'r' from the rotational axis of a cyclone rotating at an angular speed '?' is given by (the other symbols are as per standard notation)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. __________ mills are termed as disintegrators.

    • Options
    • A. Cage
    • B. Compartment
    • C. Pebble
    • D. All tumbling
      • Discuss
    • 9. A cottrel precipitator makes use of the __________ for dusty air cleaning.

    • Options
    • A. electric spark
    • B. corrona discharge
    • C. alternating current
    • D. none of these.
      • Discuss
    • 10. The sphericity of a solid particle of cubical shape is

    • Options
    • A. ?
    • B. (?/6)1/3
    • C. (?/6)1/2
    • D. ?/3
      • Discuss

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