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Chemical Engineering :: Mechanical Operations

  1. To get ultrafine particles, the equipment used is a

  2. A.
    ball mill
    B.
    rod mill
    C.
    hammer crusher
    D.
    fluid energy mill

  3. Vacuum filter is most suitable for the

  4. A.
    removal of fines from liquid.
    B.
    liquids having high vapour pressure.
    C.
    liquids of very high viscosity.
    D.
    none of these.

  5. The porosity of a compressible cake is

  6. A.
    minimum at the filter medium.
    B.
    minimum at the upstream face.
    C.
    maximum at the filter medium.
    D.
    same throughout the thickness of cake.

  7. Which of the following conveyors cannot be recommended for transportation of abrasive materials ?

  8. A.
    Belt conveyor
    B.
    Apron conveyor
    C.
    Flight conveyor
    D.
    Chain conveyor

  9. Separation of materials into products based on the difference of their sizes is called

  10. A.
    sizing
    B.
    sorting
    C.
    classification
    D.
    flocculation

  11. For classification of potable (drinking) water, we use a __________ filter.

  12. A.
    gravity sand
    B.
    plate and frame
    C.
    vacuum leaf
    D.
    rotary vacuum

  13. Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.

  14. A.
    apron
    B.
    belt
    C.
    screw
    D.
    flight

  15. Additives used for promoting the floccula-tion of particles is a/an

  16. A.
    electrolyte
    B.
    surface active agent
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

  17. In case of grinding in a ball mill

  18. A.
    wet grinding achieves a finer product size than dry grinding.
    B.
    its capacity decreases with increasing fineness of the products.
    C.
    grinding cost and power requirement increases with increasing fineness of the products.
    D.
    all (a), (b) and (c).

  19. The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m2 V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m3)

  20. A.
    3.6 AVS.ρ
    B.
    3.6 A.V.ρ
    C.
    3.6 A.S. ρ
    D.
    3.6 AVS/ρ