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Chemical Engineering :: Mechanical Operations

Mechanical Operations - Section 1
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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. A cottrel precipitator makes use of the __________ for dusty air cleaning.

    2. A.
    electric spark
    B.
    corrona discharge
    C.
    alternating current
    D.
    none of these.

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  2. Pick out the correct statement.

    3. A.
    Plastic chips are called non-cohesive solids.
    B.
    Kick's crushing law is, P/m = K . ln
    C.
    Communition is a generic term for size enlargement operation.
    D.
    Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'.

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  3. If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the

    4. A.
    linear speed of the basket is doubled.
    B.
    linear speed of the basket is halved.
    C.
    centrifugal force is doubled.
    D.
    capacity of centrifuge is increased.

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  4. The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is

    5. A.
    1.5
    B.
    1
    C.
    2
    D.
    none of these

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  5. Mixing of plastic solids is generally facilitated by

    6. A.
    dispersion
    B.
    mastication
    C.
    kneading
    D.
    none of these

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  6. The mechanism of size reduction by a hammer mill is by impact and attrition between the

    7. A.
    grinding element & the housing.
    B.
    feed particles.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

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  7. Which of the following is not an industrial screening equipment ?

    8. A.
    Sharpies centrifuge
    B.
    Vibrating screen
    C.
    Grizzly
    D.
    Trommel

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  8. Which of the following is not a wet classifier ?

    9. A.
    Sharpies supercentrifuge
    B.
    Hydrocyclones
    C.
    Dorr Oliver rake classifier
    D.
    None of these

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  9. Helical screw agitator is used for

    10. A.
    mixing highly viscous pastes.
    B.
    blending immiscible liquids.
    C.
    mixing liquids at very high temperature (> 250 °C).
    D.
    none of these.

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  10. For raschig rings, the sphericity is

    11. A.
    0.5
    B.
    1
    C.
    <1
    D.
    3

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