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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 value of 'angle of nip' is generally about

    2. A.
    16°
    B.
    32°
    C.
    52°
    D.
    64°

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  2. Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

    3. A.
    metalliferrous ores
    B.
    non-metallic ores
    C.
    basic slags
    D.
    asbestos & mica

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  3. Sulphuric acid mist is arrested by using a __________ scrubber.

    4. A.
    packed wet
    B.
    hollow wet
    C.
    venturi
    D.
    co-current

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  4. The main size reduction operation in ultrafine grinders is

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

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  5. In case of a hammer crusher,

    6. A.
    crushing takes place by impact breaking.
    B.
    maximum acceptable feed size is 30 cms.
    C.
    reduction ratio can be varied by adjusting the distance from cage to hammers.
    D.
    all (a), (b) and (c).

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  6. Jigging is a technique by which different particles can be

    7. A.
    separated by particle size.
    B.
    separated by particle density.
    C.
    separated by particle shape.
    D.
    mixed.

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  7. Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill.

    8. A.
    impact
    B.
    roll
    C.
    vibratory
    D.
    none of these

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  8. Balls for ball mills are never made of

    9. A.
    forged/cast steel
    B.
    lead
    C.
    cast iron
    D.
    alloy steel

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  9. 200 mesh screen means 200 openings per

    10. A.
    cm2
    B.
    cm
    C.
    inch
    D.
    inch2

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  10. __________ is the most commonly used 'filter aid'.

    11. A.
    Diatomaceous earth
    B.
    Fuller's earth
    C.
    Vermiculite
    D.
    Semi-plastic clay

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