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Chemical Engineering :: Mechanical Operations

  1. Length/diameter ratio of a ball mill is

  2. A.
    1.5
    B.
    1
    C.
    < 1
    D.
    > 1

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  3. Feed size of ≥ 25 cms can be accepted by

  4. A.
    ball mill
    B.
    rod mill
    C.
    fluid energy mill
    D.
    jaw crusher

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  5. Which is the most suitable conveyor for transportation of sticky material ?

  6. A.
    Apron conveyor
    B.
    Belt conveyor
    C.
    Screw conveyor
    D.
    Pneumatic conveyor

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  7. The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an

  8. A.
    bag filter
    B.
    electrostatic precipitator
    C.
    cyclone separator
    D.
    wet scrubber

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  9. Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is

  10. A.
    >10
    B.
    <10
    C.
    >100
    D.
    <100

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  11. Filtration of water in a paper mill is done by a/an __________ filter.

  12. A.
    open sand
    B.
    plate and frame
    C.
    vacuum leaf
    D.
    sparkler

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  13. Moore filter is a __________ filter.

  14. A.
    leaf
    B.
    press
    C.
    rotary
    D.
    sand

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  15. Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is

  16. A.
    0.5
    B.
    1
    C.
    2
    D.
    3

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  17. Ball mill is used for

  18. A.
    crushing
    B.
    coarse grinding
    C.
    fine grinding
    D.
    attrition

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  19. In case of a ball mill,

  20. A.
    coarse feed requires a larger ball.
    B.
    fine feed requires a larger ball.
    C.
    operating speed should be more than the critical speed.
    D.
    none of these

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