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Chemical Engineering :: Mechanical Operations

  1. Cake resistance is

  2. A.
    important in the beginning of filtration.
    B.
    decreased with the time of filtration.
    C.
    independent of pressure drop.
    D.
    none of these.

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  3. In paint industries, blending of light paste is done by using a

  4. A.
    masticator
    B.
    charge can mixer
    C.
    kneader
    D.
    none of these

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  5. A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

  6. A.
    0.50
    B.
    0.58
    C.
    0.68
    D.
    0.62

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  7. __________ is used for producing a thick suspension from a thin slurry.

  8. A.
    Cartridge filter
    B.
    Rotary drum vacuum filter
    C.
    Pressure filter thickener
    D.
    Plate and frame filter press

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  9. Wet seiving is employed, when the product contains __________ materials.

  10. A.
    abrasive
    B.
    large quantity of very fine
    C.
    coarse
    D.
    non-sticky

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  11. Energy requirement (per unit mass of material crushed/ground) is highest for

  12. A.
    jaw crusher
    B.
    rod mill
    C.
    ball mill
    D.
    fluid energy mill

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  13. The energy consumed by a ball mill depends on

  14. A.
    its speed.
    B.
    its ball load.
    C.
    the density of the material being ground.
    D.
    all (a), (b) and (c).

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  15. Energy consumption in a crusher decreases with increase in the

  16. A.
    size of the product (at constant feed size).
    B.
    capacity of the crushing machine.
    C.
    size of feed (at constant reduction ratio).
    D.
    all (a), (b) & (c).

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  17. In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).

  18. A.
    Weber
    B.
    Peclet
    C.
    Brinkman
    D.
    Schmidt

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  19. The term 'angle of nip' is concerned with the operation of the __________ crushers.

  20. A.
    jaw
    B.
    roll
    C.
    gyratory
    D.
    none of these

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