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Chemical Engineering :: Mechanical Operations

  1. Grinding characteristic of a material is given by its

  2. A.
    HGI
    B.
    angle of repose
    C.
    shatter index
    D.
    abrasion index.

  3. Which of the following is not a non-metalliferous mineral?

  4. A.
    Calcite
    B.
    Fluorspar
    C.
    Quartz
    D.
    Cassiterrite

  5. Filter medium resistance is important during the __________ of filtration.

  6. A.
    early stages.
    B.
    final stages.
    C.
    entire process.
    D.
    none of these.

  7. Float and sink test determines the possibility of cleaning of coal by a process based on the

  8. A.
    gravity separation
    B.
    wettability
    C.
    particle shape
    D.
    none of these

  9. __________ baffles are provided in ball mills.

  10. A.
    Horizontal
    B.
    No
    C.
    Only two
    D.
    None of these

  11. Mixer used for rubber compounding is

  12. A.
    mixer-extruder
    B.
    banbury internal mixer
    C.
    muller mixer
    D.
    pug mill

  13. For spheres, the specific surface shape factor is given by

  14. A.
    AD/V
    B.
    D/V
    C.
    A/V
    D.
    AD/V

  15. __________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.

  16. A.
    Buhrstone
    B.
    Roller
    C.
    Attrition
    D.
    Pebble

  17. In case of a hammer crusher, the final product size depends on the

  18. A.
    feed rate.
    B.
    rotor speed.
    C.
    clearance between hammer & grinding plates.
    D.
    all (a), (b) and (c).