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  • Question

  • In ball mill operation, the feed size (Df in meters) and the ball diameter (Db in metres) are related as ( where, K = grindability constant (varying from 0.9 to 1.4 in increasing order of hard ness))


  • Options
  • A. Db2 = K.Df
  • B. Db = K.Df
  • C. Db3 = K.Df
  • D. Db2 = K.Df2

  • Correct Answer
  • Db2 = K.Df 

    • More questions

    • 1. Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is

    • Options
    • A. more
    • B. less
    • C. same
    • D. cither (a) or (b); depends upon the I.D. of the pipe
      • Discuss
    • 2. Aniline point of the diesel is a measure of its __________ content.

    • Options
    • A. aromatic
    • B. paraffin
    • C. olefin
    • D. naphthene
      • Discuss
    • 3. Dry powdery solid materials are transported by a __________ conveyor.

    • Options
    • A. belt
    • B. bucket
    • C. screw
    • D. none of these
      • Discuss
    • 4. Size reduction does not occur due to compression in case of

    • Options
    • A. rod mills
    • B. gyratory crushers
    • C. jaw crushers
    • D. smooth roll crushers
      • Discuss
    • 5. Thorium can be converted into U-233 in a __________ reactor.

    • Options
    • A. liquid metal cooled
    • B. fast breeder
    • C. thermal
    • D. swimming pool
      • Discuss
    • 6. A rivetted joint does not fail by __________ of rivets.

    • Options
    • A. tearing
    • B. shearing
    • C. tearing of the plate across a row
    • D. none of these
      • Discuss
    • 7. The synthetic fibres produced from __________ are known as rayon.

    • Options
    • A. lignin
    • B. cellulose
    • C. polyamides
    • D. ethylene glycol
      • Discuss
    • 8. A/an __________ is used for changing the direction of a pipeline.

    • Options
    • A. elbow
    • B. union
    • C. flange
    • D. disc compensator
      • Discuss
    • 9. Sucrose content in the raw juice extracted from sugar cane is about __________ percent.

    • Options
    • A. 1 - 2
    • B. 15 - 20
    • C. 50 - 60
    • D. 80 - 85
      • Discuss
    • 10. The ratio of volume of an atom to that of its nucleus is

    • Options
    • A. 1012
    • B. 10-12
    • C. 10-8
    • D. 108
      • Discuss

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