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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. Screen capacity is expressed in terms of

    2. A.
    tons/hr
    B.
    tons/ft2
    C.
    both (a) & (b)
    D.
    tons/hr-ft2

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  2. A screen is said to be blinded, when the

    3. A.
    oversizes are present in undersize fraction.
    B.
    undersizes are retained in oversize fraction.
    C.
    screen is plugged with solid particles.
    D.
    screen capacity is abruptly increased.

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  3. What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?

    4. A.
    0.5
    B.
    1.0
    C.
    2.76
    D.
    0.66

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  4. Percentage of drum submerged in the slurry in case of rotary drum filter is

    5. A.
    3
    B.
    30
    C.
    85
    D.
    25

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  5. Filter medium resistance is that offered by the

    6. A.
    filter cloth.
    B.
    embedded particles in the septum.
    C.
    filter cloth and the embedded particle collectively.
    D.
    none of these.

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  6. In a roll crusher, both the rolls

    7. A.
    have the same diameter.
    B.
    are rotated towards each other.
    C.
    run either at the same or different speeds.
    D.
    all (a), (b) and (c).

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  7. Tube mill compared to ball mill

    8. A.
    produces finer products.
    B.
    is long in comparison with its diameter.
    C.
    uses smaller balls.
    D.
    all (a), (b) & (c).

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  8. Critical speed of rotation, N (in rps - rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre. )

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  9. For the preliminary breaking of hard rock, we use a

    10. A.
    gyratory crusher
    B.
    ball mill
    C.
    tube mill
    D.
    squirrel-cage disintegrator

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  10. Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.

    11. A.
    constant rate
    B.
    varying pressure
    C.
    varying rate
    D.
    constant pressure

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