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Chemical Engineering :: Mechanical Operations

  1. Screen efficiency is

  2. A.
    recovery/rejection
    B.
    recovery
    C.
    rejection
    D.
    none of these

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  3. For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a

  4. A.
    Buhrstone mill
    B.
    ball mill
    C.
    crushing rolls
    D.
    hammer mill

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  5. Handling of ashes and similar materials can be done best by a __________ conveyor.

  6. A.
    flight
    B.
    drag or slat
    C.
    belt
    D.
    ribbon.

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  7. Which of the following must be stored in silos and not in open yard ?

  8. A.
    Coke breeze
    B.
    High V.M. bituminous coal
    C.
    Sand
    D.
    None of these

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  9. Apron conveyors are used for

  10. A.
    heavy loads & short runs.
    B.
    small loads & long runs.
    C.
    heavy loads & long runs.
    D.
    none of these.

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  11. Sedimentation on commercial scale occurs in

  12. A.
    classifiers
    B.
    thickeners
    C.
    rotary drum filters
    D.
    cyclones

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  13. With increase in drum speed, in a rotary drum filter, the filtration rate

  14. A.
    increases
    B.
    increases linearly
    C.
    decreases
    D.
    is not affected

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  15. Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

  16. A.
    Jaw crusher, Ball mill, Fluid energy mill
    B.
    Ball mill, Jaw crusher, Fluid energy mill
    C.
    Fluid energy mill, Jaw crusher, Ball mill
    D.
    Fluid energy mill, Ball mill, Jaw crusher

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  17. 200 mesh seive size corresponds to __________ microns.

  18. A.
    24
    B.
    74
    C.
    154
    D.
    200

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  19. What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls ?

  20. A.
    16°
    B.
    32°
    C.
    40°
    D.
    46°

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