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Chemical Engineering :: Mechanical Operations

Mechanical Operations - Section 1
Mechanical Operations - Section 2
Mechanical Operations - Section 3
Mechanical Operations - Section 4
Mechanical Operations - Section 5
Mechanical Operations - Section 6
Mechanical Operations - Section 7
Mechanical Operations - Section 8
Mechanical Operations - Section 9

  1. The reduction ratio for fine grinders is

    2. A.
    5-10
    B.
    10-20
    C.
    20-40
    D.
    as high as 100

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  2. Which of the following is the hardest material ?

    3. A.
    Calcite
    B.
    Quartz
    C.
    Corundum
    D.
    Gypsum

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  3. General mechanism of size reduction in intermediate and fine grinder is by

    4. A.
    cutting action.
    B.
    compression.
    C.
    compression and tearing.
    D.
    impact and attrition.

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  4. A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for __________ flow of filtrate.

    5. A.
    compressible cakes and laminar
    B.
    incompressible cake and laminar
    C.
    compressible cake and turbulent
    D.
    incompressible cake and turbulent

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  5. The work index in Bond's law for crushing of solids has the following dimensions

    6. A.
    no units (dimensionless)
    B.
    kWh/ton
    C.
    kW/ton
    D.
    kWh.m1/2/ton

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  6. Ore concentration by jigging is based on the difference in the __________ of the particles.

    7. A.
    specific gravities
    B.
    wettability
    C.
    shape
    D.
    none of these

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  7. Size measurement of ultrafine particles can be best expressed in terms of

    8. A.
    centimetre
    B.
    screen size
    C.
    micron
    D.
    surface area per unit mass

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  8. Reduction ratio of crushers is the

    9. A.
    ratio of feed opening to discharge opening.
    B.
    ratio of discharge opening to feed opening.
    C.
    determining factor for minimum dia of the feed and the product.
    D.
    none of these.

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  9. Which is a secondary crusher for a hard & tough stone ?

    10. A.
    Jaw crusher
    B.
    Cone crusher
    C.
    Impact crusher
    D.
    Toothed roll crusher

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  10. Which of the following equations is Rittinger's crushing law ? (where P = power required by the machine, m = feed rate, k = a constant = volume surface mean diameter of feed & product respectively.)

    11. A.
    P/m = K/Dp
    B.
    P/m = K . ln
    C.
    P/m = K .
    D.
    none of these.

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