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Chemical Engineering :: Mechanical Operations

  1. Out of the following size reduction equipments, the maximum feed size can be accepted by the

  2. A.
    tube mill
    B.
    ball mill
    C.
    jaw crusher
    D.
    jet pulveriser

  3. Bucket elevators are not suitable for the vertical lifting of __________ materials.

  4. A.
    fine (e.g. - 200 mesh size coal)
    B.
    sticky (e.g. clay paste)
    C.
    small lumpy (e.g. grains and sand)
    D.
    free flowing

  5. The most common filter aid is

  6. A.
    diatomaceous earth
    B.
    calcium silicate
    C.
    sodium carbonate
    D.
    silica gel

  7. For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.

  8. A.
    plate & frame
    B.
    shell & leaf
    C.
    sand
    D.
    rotary vacuum

  9. For separation of sugar solution from settled out mud, we use a __________ filter.

  10. A.
    sparkler
    B.
    plate and frame
    C.
    centrifugal
    D.
    rotary drum vaccum

  11. The sphericity of a cylinder of 1 mm diameter and length 3 mm is

  12. A.
    0.9
    B.
    0.78
    C.
    0.6
    D.
    0.5

  13. Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.

  14. A.
    0.007
    B.
    0.30
    C.
    50
    D.
    0.014

  15. The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a

  16. A.
    boundary mixer.
    B.
    propeller agitator.
    C.
    sharpies centrifuge.
    D.
    none of these.

  17. Traces of solids are removed from, liquid in a

  18. A.
    classifier
    B.
    clarifier
    C.
    sparkler filter
    D.
    rotary vacuum filter

  19. __________ balls capable of grinding the feed in a ball mill gives the maximum efficiency.

  20. A.
    Cast iron
    B.
    Minimum size
    C.
    Maximum size
    D.
    Elliptical