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  • Question

  • Carbon black is pulverised in a


  • Options
  • A. hammer crusher
  • B. ball mill
  • C. roll crusher
  • D. gyratory crusher

  • Correct Answer
  • ball mill 

    • Mechanical Operations problems

    Search Results

    • 1. Which of the following is a fine crusher?

    • Options
    • A. Blake jaw crusher
    • B. Gyratory crusher
    • C. Toothed roll crusher
    • D. Dodge jaw crusher
      • Discuss
    • 2. Which of the following is not used as filter aid?

    • Options
    • A. Asbestos
    • B. Diatomaceous earth
    • C. Purified wood cellulose
    • D. Rice husk
      • Discuss
    • 3. Which of the following is not used as a surface active agent in a flocculation operation?

    • Options
    • A. Sodium silicate
    • B. Quartz
    • C. Lime
    • D. Alumina
      • Discuss
    • 4. Removal of activated carbon from glycerine is done by

    • Options
    • A. plate and frame filter
    • B. rotary vacuum filter
    • C. batch basket centrifuge
    • D. none of these
      • Discuss
    • 5. A propeller agitator

    • Options
    • A. produces mainly axial flow.
    • B. is used for mixing high viscosity pastes.
    • C. runs at very slow speed (2 rpm).
    • D. all (a), (b) and (c)
      • Discuss
    • 6. Limestone is normally crushed in a

    • Options
    • A. roll crusher
    • B. hammer crusher
    • C. ball mill
    • D. tube mill
      • Discuss
    • 7. What is the reduction ratio in a fine crushing operation having following feed and product sizes?

    • Options
    • A. 0.5
    • B. 2
    • C. 5
    • D. 10
      • Discuss
    • 8. Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ? = density of material to be crushed, kg/m3 here, V =?N.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

    • Options
    • A. 3.6 V.W.Dr.?
    • B. 3.6 V.W. ?
    • C. 3.6 W.Dr.?
    • D. 3.6 V.W.Dr/?
      • Discuss
    • 9. Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to __________ and the cycle time (where, ? = filtrate viscosity Rm = filter medium resistance Rc = cake resistance ).

    • Options
    • A. ?
    • B. 1/?
    • C. 1/?
    • D. 1/?2
      • Discuss
    • 10. __________ mill is not a revolving mill.

    • Options
    • A. Pebble
    • B. Compartment
    • C. Cage
    • D. Tube
      • Discuss

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