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Chemical Engineering :: Mechanical Operations

  1. Energy consumed for crushing one ton of material ranges from __________ kWh.

  2. A.
    0.01 to 0.1
    B.
    0.5 to 1.5
    C.
    2 to 3.5
    D.
    4 to 5.

  3. For transporting pasty material, one will use a/an

  4. A.
    apron conveyor
    B.
    belt conveyor
    C.
    screw colaveyor
    D.
    bucket elevator

  5. Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a

  6. A.
    disc bowl centrifuge.
    B.
    sharpies supercentrifuge.
    C.
    batch basket centrifuge.
    D.
    sparkler filter.

  7. A tube mill compared to a ball mill

  8. A.
    has a higher length/diameter ratio.
    B.
    produces a coarser product.
    C.
    has a higher diameter/length ratio.
    D.
    uses much larger balls.

  9. Trommels separate a mixture of particles depending on their

  10. A.
    size
    B.
    density
    C.
    wettability
    D.
    electrical & magnetic properties

  11. Basic slag is not ground in

  12. A.
    jaw crushers
    B.
    ball mills
    C.
    compartment mills
    D.
    tube mills

  13. Grindability of a material does not depend upon its

  14. A.
    elasticity
    B.
    hardness
    C.
    toughness
    D.
    size

  15. Shape factor for a cylinder whose length equals its diameter is

  16. A.
    1.5
    B.
    0.5
    C.
    1.0
    D.
    2.0

  17. In case of a hammer crusher, the

  18. A.
    feed may be highly abrasive (Moh's scale >5).
    B.
    minimum product size is 3 mm.
    C.
    maximum feed size may be 50 mm.
    D.
    rotor shaft carrying hammers can be vertical or horizontal.

  19. Dust laden air can be purified using a

  20. A.
    cyclone separator
    B.
    bag filter
    C.
    gravity settler
    D.
    tubular centrifuge