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Mechanical Operations problems


  • 1. The distribution given by microscopic analysis of powder is

  • Options
  • A. number
  • B. length
  • C. area
  • D. volume
  • Discuss
  • 2. If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is ?s is defined by

  • Options
  • A. ?s = 6 Vp/dp sp
  • B. ?s = Vp/dp sp
  • C. ?s = 6 dp Sp/Vp
  • D. ?s = dp Sp/Vp
  • Discuss
  • 3. Pick out the wrong statement.

  • Options
  • A. Close circuit grinding is more economical than open circuit grinding.
  • B. Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement 'industries'.
  • C. The equipment used for the removal of traces of solids from a liquid is called a classifier.
  • D. Size enlargement is a mechanical operation exemplified by medicinal tablet making.
  • Discuss
  • 4. Which of the following is a pressure filter?

  • Options
  • A. Leaf filter (Moore filter).
  • B. Plate and flame filter.
  • C. Rotary drum filter.
  • D. Sand filter.
  • Discuss
  • 5. The main size reduction operation in ultrafine grinders is

  • Options
  • A. cutting
  • B. attrition
  • C. compression
  • D. impact
  • Discuss
  • 6. Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.

  • Options
  • A. flight
  • B. slat or drag
  • C. ribbon
  • D. screw
  • Discuss
  • 7. Equivalent diameter of a particle is the diameter of the sphere having the same

  • Options
  • A. ratio of surface to volume as the actual volume.
  • B. ratio of volume to surface as the particle.
  • C. volume as the particle.
  • D. none of these.
  • Discuss
  • 8. Filter aid is used to

  • Options
  • A. increase the rate of filtration.
  • B. decrease the pressure drop.
  • C. increase the porosity of the cake.
  • D. act as a support base for the septum.
  • Discuss
  • 9. __________ centrifuge is normally used in sugar mills.

  • Options
  • A. Tubular bowl
  • B. Disc-bowl
  • C. Suspended batch basket
  • D. Perforated horizontal basket continuous
  • Discuss
  • 10. Which of the following is not an ultrafine grinder (colloid mill)?

  • Options
  • A. Micronizers
  • B. Agitated mills and fluid energy mills
  • C. Toothed roll crusher
  • D. Hammer mills with internal classification
  • Discuss

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