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  • Question
  • Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ?= density of particles)


  • Options
  • A. m/? . Vp
  • B. m . ?/Vp
  • C. m . Vp/?
  • D. Vp/m . ?

  • Correct Answer
  • m/? . Vp 


  • Mechanical Operations problems


    Search Results


    • 1. Gravity settling process is not involved in the working of a

    • Options
    • A. hydrocyclone
    • B. classifier
    • C. dorr-thickener
    • D. sedimentation tank
    • Discuss
    • 2. Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)?

    • Options
    • A. Trough washer
    • B. Baum jig washer
    • C. Spiral separator
    • D. Froth floatation
    • Discuss
    • 3. Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

    • Options
    • A. metalliferrous ores
    • B. non-metallic ores
    • C. basic slags
    • D. asbestos & mica
    • Discuss
    • 4. Which of the following is not a part of the Blake jaw crusher?

    • Options
    • A. Hanger
    • B. Check plates
    • C. Toggles
    • D. Pitman
    • Discuss
    • 5. __________ is the most commonly used 'filter aid'.

    • Options
    • A. Diatomaceous earth
    • B. Fuller's earth
    • C. Vermiculite
    • D. Semi-plastic clay
    • Discuss
    • 6. Which of the following mineral dressing operations is termed as 'comminution'?

    • Options
    • A. Panning
    • B. Spiralling
    • C. Tabling
    • D. None of these
    • Discuss
    • 7. Which of the following relationships between co-efficinet of friction (?) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct?

    • Options
    • A. ? > tan ?
    • B. ? ? tan ?
    • C. ? > tan 2?
    • D. ? ? tan ?
    • Discuss
    • 8. Two particles are called to be equal settling, if they are having the same.

    • Options
    • A. size.
    • B. specific gravity.
    • C. terminal velocities in the same fluid & in the same field of force.
    • D. none of these.
    • Discuss
    • 9. Ball mills and tube mills with flint or porcelain balls are used for size reduction of

    • Options
    • A. asbestos
    • B. rubber
    • C. non-metallic ores
    • D. limestone
    • Discuss
    • 10. 200 mesh screen means 200 openings per

    • Options
    • A. cm2
    • B. cm
    • C. inch
    • D. inch2
    • Discuss


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