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  • Question

  • 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

  • Correct Answer
  • ?s = 6 Vp/dp sp 

    • Mechanical Operations problems

    Search Results

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

    • Options
    • A. number
    • B. length
    • C. area
    • D. volume
      • Discuss
    • 2. Foot valves provided in pumps are __________ valves.

    • Options
    • A. relief
    • B. three/four way
    • C. pressure reducing
    • D. directional control
      • Discuss
    • 3. Pick out the correct statement.

    • Options
    • A. A forced vortex occurs when fluid rotates as a solid about an axis.
    • B. In laminar flow, Newton's law of viscosity does not apply.
    • C. A free vortex occurs, when fluidrotates as a solid.
    • D. In turbulent flow, there are neither cross-currents nor eddies.
      • Discuss
    • 4. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

    • Options
    • A. 0.5
    • B. 1
    • C. 1.5
    • D. 2
      • Discuss
    • 5. Dimension of absolute viscosity is

    • Options
    • A. ML-1T-1
    • B. MLT-1
    • C. ML-1T
    • D. MLT
      • Discuss
    • 6. 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
    • 7. 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
    • 8. The main size reduction operation in ultrafine grinders is

    • Options
    • A. cutting
    • B. attrition
    • C. compression
    • D. impact
      • Discuss
    • 9. 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
    • 10. 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

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