logo

CuriousTab

CuriousTab

Mechanical Operations problems

  • 1. The specific surface of spherical particles is given by (where D and ? are diameter and density of particle).

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 2. 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
  • 3. 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
  • 4. 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
  • 5. 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)
    • 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

First 38 39 40 ... 42 .. 44 45 Last

Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.