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Chemical Engineering :: Mechanical Operations

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

  2. A.
    1
    B.
    50
    C.
    100
    D.
    500

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  3. Colloid mills achieve size reduction mainly by

  4. A.
    impact
    B.
    attrition
    C.
    cutting
    D.
    compression

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  5. Mesh indicates the number of holes per

  6. A.
    square inch
    B.
    linear inch
    C.
    square foot
    D.
    linear foot

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

  8. A.
    10
    B.
    25
    C.
    50
    D.
    75

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  9. According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively).

  10. A.
    (S/V)p
    B.
    (S/V)p
    C.
    (S/V)2p
    D.
    (S/V)f

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  11. Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?

  12. A.
    Rittinger's law
    B.
    Kick's law
    C.
    Bond's law
    D.
    none of these

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  13. Electrical energy consumed by a jaw crusher is not a function of the

  14. A.
    average feed size
    B.
    average product size
    C.
    machine capacity
    D.
    none of these

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  15. Size reduction mechanism used in Jaw crushers is

  16. A.
    attrition
    B.
    compression
    C.
    cutting
    D.
    impact

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  17. Trommels employ __________ for screening of materials.

  18. A.
    fibrous cloth
    B.
    woven wire screen
    C.
    punched plate
    D.
    none of these

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  19. A widely used size reduction equipment for __________ is Bradford breaker.

  20. A.
    talc
    B.
    coal
    C.
    iron core
    D.
    wheat

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