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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

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

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

  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

  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

  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

  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

  13. Moore filter is a __________ filter.

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

  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

  17. Ball mill is used for

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

  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