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Chemical Engineering :: Mechanical Operations

  1. Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate)

  2. A.
    S
    B.
    1/R
    C.
    1/μ
    D.
    all (a), (b) & (c)

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  3. A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is

  4. A.
    w2 . R2 . ρL
    B.
    w2 . δ2 . ρL
    C.
    w2 . δρL (2R + δ)
    D.
    w2 . R . ρL(R + 2δ)

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  5. Which one is a filter aid ?

  6. A.
    Convas fabric
    B.
    Diatomaceous earth
    C.
    Calcined lime
    D.
    None of these

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  7. To remove dirt from the flowing fluid, we use a

  8. A.
    coagulant
    B.
    gravity settler
    C.
    strains
    D.
    clarifier

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  9. Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher ?

  10. A.
    Rod mill
    B.
    Fluid energy mill
    C.
    Gyratory crusher
    D.
    Ball mill

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  11. Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the

  12. A.
    coagulation
    B.
    flocculation
    C.
    sedimentation
    D.
    clarification

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  13. Ultrafine grinders operate principally by

  14. A.
    slow compression
    B.
    impact
    C.
    attrition
    D.
    cutting action

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  15. Half the angle of nip, (α), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively).

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  17. Which of the following comes in the category of primary crusher for hard and tough stone ?

  18. A.
    Jaw crusher
    B.
    Cone crusher
    C.
    Gyratory crusher
    D.
    None of these

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  19. Crushing efficiency of a machine ranges between __________ percent.

  20. A.
    0.1 to 2
    B.
    5 to 10
    C.
    20 to 25
    D.
    50 to 70

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