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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.

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

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

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  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.

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  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.

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  9. Trommels separate a mixture of particles depending on their

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

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  11. Basic slag is not ground in

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

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  13. Grindability of a material does not depend upon its

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

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  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

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  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.

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  19. Dust laden air can be purified using a

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

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