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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

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  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.

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

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  7. Gizzlies are used for separating __________ solids.

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

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

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

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

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

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  13. __________ mills are termed as impactors.

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

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

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

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

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

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

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

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