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Chemical Engineering :: Mechanical Operations

  1. Soft & non-abrasive materials can be made into fines by

  2. A.
    attrition
    B.
    compression
    C.
    cutting
    D.
    none of these

  3. In constant pressure filtration,

  4. A.
    resistance decreases with time
    B.
    rate of filtration is constant
    C.
    rate of filtration increases with time
    D.
    rate of filtration decreases with time

  5. The critical speed of a trommel (N) is related to its dia (D) as

  6. A.
    N ∝
    B.
    N ∝ D
    C.
    N ∝ D
    D.
    N ∝

  7. Which of the following minerals is not subjected to magnetic separation method?

  8. A.
    Rutile
    B.
    Galena
    C.
    Chromite
    D.
    Siderite

  9. Which of the following is not a revolving/tumbling mill used for size reduction?

  10. A.
    Compartment mill
    B.
    Pebble mill
    C.
    Cage mill
    D.
    Rod mill

  11. Which of the following achieves the least reduction ratio for a given feed size?

  12. A.
    Jaw crusher
    B.
    Roll crusher
    C.
    Cone crusher
    D.
    Gyratory crusher

  13. A fluid energy mill is used for

  14. A.
    cutting
    B.
    grinding
    C.
    ultragrinding
    D.
    crushing

  15. Filtration should be stopped in a filter press, if the

  16. A.
    cake becomes very dense.
    B.
    liquor stops flowing out to the discharge.
    C.
    filtration pressure rises suddenly.
    D.
    both(b)&(c).

  17. For coarse reduction of hard solids, use

  18. A.
    impact
    B.
    attrition
    C.
    compression
    D.
    cutting

  19. In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the __________ crushing.

  20. A.
    primary
    B.
    secondary
    C.
    fine
    D.
    ultrafine