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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

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  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

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  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 ∝

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

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

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  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

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  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

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  13. A fluid energy mill is used for

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

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  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).

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  17. For coarse reduction of hard solids, use

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

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  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

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