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  • Question

  • 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/?

  • Correct Answer
  • 3.6 V.W.Dr.? 

    • Mechanical Operations problems

    Search Results

    • 1. 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
    • 2. Limestone is normally crushed in a

    • Options
    • A. roll crusher
    • B. hammer crusher
    • C. ball mill
    • D. tube mill
      • Discuss
    • 3. Carbon black is pulverised in a

    • Options
    • A. hammer crusher
    • B. ball mill
    • C. roll crusher
    • D. gyratory crusher
      • Discuss
    • 4. 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
    • 5. Which of the following is not used as filter aid?

    • Options
    • A. Asbestos
    • B. Diatomaceous earth
    • C. Purified wood cellulose
    • D. Rice husk
      • Discuss
    • 6. 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
    • 7. __________ mill is not a revolving mill.

    • Options
    • A. Pebble
    • B. Compartment
    • C. Cage
    • D. Tube
      • Discuss
    • 8. The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is

    • Options
    • A. 2
    • B. 2
    • C. 1.5
    • D. 3
      • Discuss
    • 9. In case of a plate and frame filter press, filtrate flow through the cake follows __________ flow.

    • Options
    • A. plug
    • B. turbulent
    • C. laminar
    • D. none of these
      • Discuss
    • 10. Dispersion of a gas through liquid is done by using a

    • Options
    • A. sparger
    • B. kneader
    • C. masticator
    • D. none of these
      • Discuss

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