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  • Question

  • The operating speed of a ball mill should be __________ the critical speed.


  • Options
  • A. less than
  • B. much more than
  • C. at least equal to
  • D. slightly more than

  • Correct Answer
  • less than 

    • Mechanical Operations problems

    Search Results

    • 1. Shape factor for a cylinder whose length equals its diameter is

    • Options
    • A. 1.5
    • B. 0.5
    • C. 1.0
    • D. 2.0
      • Discuss
    • 2. Moore filter is a __________ filter.

    • Options
    • A. leaf
    • B. press
    • C. rotary
    • D. sand
      • Discuss
    • 3. Which of the following is a vacuum filter?

    • Options
    • A. Filter press
    • B. Rotary disc filter
    • C. Batch basket centrifuge
    • D. Tank filter (Nutsch filter)
      • Discuss
    • 4. General crushing equation is given by . Bond's crushing law isobtained by solving this equation for n = __________ and feed of infinite size.

    • Options
    • A. 1
    • B. 1.5
    • C. 2
    • D. 2.5
      • Discuss
    • 5. Bond crushing law

    • Options
    • A. calls for relatively less energy for the smaller product particles, than does the Rittinger law.
    • B. is less realistic in estimating the power requirements of commercial crushers.
    • C. states that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product.
    • D. states that the work required for the crushing is proportional to the new surface created.
      • Discuss
    • 6. Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.

    • Options
    • A. filtering
    • B. washing
    • C. drying
    • D. all (a), (b) & (c)
      • Discuss
    • 7. The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size )

    • Options
    • A. c/s
    • B. s/c
    • C. s . c
    • D. 1/s . c
      • Discuss
    • 8. Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its

    • Options
    • A. easier grindability
    • B. poor grindability
    • C. high power consumption in grinding
    • D. none of these
      • Discuss
    • 9. Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.

    • Options
    • A. Kozney-Karman
    • B. Hagen-Poiseulle's
    • C. Fanning's
    • D. Kremser
      • Discuss
    • 10. Energy consumed for crushing one ton of material ranges from __________ kWh.

    • Options
    • A. 0.01 to 0.1
    • B. 0.5 to 1.5
    • C. 2 to 3.5
    • D. 4 to 5.
      • Discuss

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