Home / Chemical Engineering / Mechanical Operations :: Section 3

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

  3. Colloid mills achieve size reduction mainly by

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

  5. Mesh indicates the number of holes per

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

  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

  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

  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

  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

  15. Size reduction mechanism used in Jaw crushers is

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

  17. Trommels employ __________ for screening of materials.

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

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

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