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  • Question

  • The grinding in a hammer crusher takes place due to the


  • Options
  • A. attrition
  • B. impact
  • C. both (a) & (b)
  • D. neither (a) nor (b)

  • Correct Answer
  • both (a) & (b) 

    • Mechanical Operations problems

    Search Results

    • 1. Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

    • Options
    • A. Jaw crusher, Ball mill, Fluid energy mill
    • B. Ball mill, Jaw crusher, Fluid energy mill
    • C. Fluid energy mill, Jaw crusher, Ball mill
    • D. Fluid energy mill, Ball mill, Jaw crusher
      • Discuss
    • 2. With increase in drum speed, in a rotary drum filter, the filtration rate

    • Options
    • A. increases
    • B. increases linearly
    • C. decreases
    • D. is not affected
      • Discuss
    • 3. Pick out the correct statement.

    • Options
    • A. Plastic chips are called non-cohesive solids.
    • B. Kick's crushing law is, P/m = K . ln
    • C. Communition is a generic term for size enlargement operation.
    • D. Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'.
      • Discuss
    • 4. The specific surface of spherical particles is given by (where D and ? are diameter and density of particle).

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. Apron conveyors are used for

    • Options
    • A. heavy loads & short runs.
    • B. small loads & long runs.
    • C. heavy loads & long runs.
    • D. none of these.
      • Discuss
    • 6. The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of diameter di and mass mi (i = 1, 2, 3, ...... ?) is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. Float and sink test determines the possibility of cleaning of coal by a process based on the

    • Options
    • A. gravity separation
    • B. wettability
    • C. particle shape
    • D. none of these
      • Discuss
    • 8. __________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.

    • Options
    • A. Buhrstone
    • B. Roller
    • C. Attrition
    • D. Pebble
      • Discuss
    • 9. Which of the following is not a non-metalliferous mineral?

    • Options
    • A. Calcite
    • B. Fluorspar
    • C. Quartz
    • D. Cassiterrite
      • Discuss
    • 10. For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns.

    • Options
    • A. 5
    • B. 50
    • C. 500
    • D. 5000
      • Discuss

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