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  • Question
  • The speed of a rotary drum vacuum filter may be about __________ rpm.


  • Options
  • A. 1
  • B. 50
  • C. 100
  • D. 500

  • Correct Answer



  • Mechanical Operations problems


    Search Results


    • 1. For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.

    • Options
    • A. 10
    • B. 25
    • C. 50
    • D. 75
    • Discuss
    • 2. Size reduction of asbestos and mica is done by

    • Options
    • A. hammer mills
    • B. rod mills
    • C. gyratory crushers
    • D. crushing rolls
    • Discuss
    • 3. The most common filter aid is

    • Options
    • A. diatomaceous earth
    • B. calcium silicate
    • C. sodium carbonate
    • D. silica gel
    • Discuss
    • 4. Moisture can be removed from lubricating oil using

    • Options
    • A. tubular centrifuge
    • B. clarifier
    • C. sparkler filter
    • D. vacuum leaf filter
    • Discuss
    • 5. A pebble mill

    • Options
    • A. is a ball mill.
    • B. employs flints or ceramic pebbles as the grinding medium.
    • C. is a tube mill lined with ceramic or other non-metallic liner.
    • D. both (b) and (c).
    • Discuss
    • 6. The sphericity of a cylinder of 1 mm diameter and length 3 mm is

    • Options
    • A. 0.9
    • B. 0.78
    • C. 0.6
    • D. 0.5
    • Discuss
    • 7. Size reduction mechanism used in Jaw crushers is

    • Options
    • A. attrition
    • B. compression
    • C. cutting
    • D. impact
    • Discuss
    • 8. Pick out the wrong statement.

    • Options
    • A. Gape is the greatest distance between the crushing surfaces or the jaws.
    • B. The angle of nip (2?) is the angle between roll faces at the level where they will j ust take hold of a particle and draw it in the crushing zone.
    • C. Crushing efficiency is the ratio of the energy absorbed by the solid to the surfaces energy created by crushing.
    • D. Reduction ratio is the ratio of the maximum size of the particles in the feed to that in the product.
    • Discuss
    • 9. A widely used size reduction equipment for __________ is Bradford breaker.

    • Options
    • A. talc
    • B. coal
    • C. iron core
    • D. wheat
    • Discuss
    • 10. The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a

    • Options
    • A. boundary mixer.
    • B. propeller agitator.
    • C. sharpies centrifuge.
    • D. none of these.
    • Discuss


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