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Chemical Engineering :: Mechanical Operations

  1. Which of the following gives the crushing energy required to create new surface ?

  2. A.
    Taggarts rule
    B.
    Fick's law
    C.
    Rittinger's law
    D.
    none of these

  3. In filtration, the use of 'filter aid' helps in

  4. A.
    reducing the filtration pressure.
    B.
    accelerating the rate of filtration.
    C.
    deplugging the filter medium.
    D.
    enhancing the cake porosity in case of a dense impermeable cake.

  5. Critical Speed (Nc) of a ball mill is given by(where R1 and R2 are radii of ball mill and the ball respectively).


  6. Gizzlies are used for separating __________ solids.

  7. A.
    coarse
    B.
    fine
    C.
    any size
    D.
    none of these

  8. Which of the following clay mixing devices is vacuum operated for deairation of clay?

  9. A.
    Banbery mixer
    B.
    Pug mill
    C.
    Muller-mixer
    D.
    None of these

  10. Pick out the material having minimum Rittinger's number.

  11. A.
    Calcite
    B.
    Pyrite
    C.
    Quartz
    D.
    Galena

  12. __________ mills are termed as impactors.

  13. A.
    Hammer
    B.
    Cage
    C.
    Rolling-compression
    D.
    none of these

  14. In case of a revolving mill, wet grinding compared to dry grinding

  15. A.
    requires more energy.
    B.
    has less capacity.
    C.
    complicates handling & classification of the product.
    D.
    none of these.

  16. To get a fine talc powder from its granules, the equipment used is

  17. A.
    roller crusher
    B.
    ball mill
    C.
    jaw crusher
    D.
    gyratory crusher

  18. For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is

  19. A.
    2250
    B.
    1125
    C.
    460
    D.
    230