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Chemical Engineering :: Mechanical Operations

  1. The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.

  2. A.
    same as
    B.
    2.5 times
    C.
    5 times
    D.
    10 times

  3. In classification, particles are said to be equal settling, if they have the same terminal velocities in the

  4. A.
    different fluids
    B.
    same fluid
    C.
    same field of force
    D.
    both (b) and (c)

  5. Dispersion of a gas through liquid is done by using a

  6. A.
    sparger
    B.
    kneader
    C.
    masticator
    D.
    none of these

  7. Work index is defined as the

  8. A.
    gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen.
    B.
    energy needed to crush one tonne of feed to 200 microns.
    C.
    energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen.
    D.
    energy needed to crush one ton of feed to 100 microns.

  9. Removal of activated carbon from glycerine is done by

  10. A.
    plate and frame filter
    B.
    rotary vacuum filter
    C.
    batch basket centrifuge
    D.
    none of these

  11. What is the reduction ratio in a fine crushing operation having following feed and product sizes?

  12. A.
    0.5
    B.
    2
    C.
    5
    D.
    10