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Chemical Engineering :: Mechanical Operations

  1. The distribution given by microscopic analysis of powder is

  2. A.
    number
    B.
    length
    C.
    area
    D.
    volume

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  3. Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles)

  4. A.
    m/ρ . Vp
    B.
    m . ρ/Vp
    C.
    m . Vp
    D.
    Vp/m . ρ

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  5. For a non-spherical particle, the sphericity

  6. A.
    is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.
    B.
    has the dimension of length.
    C.
    is always less than 1.
    D.
    is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle.

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  7. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

  8. A.
    4
    B.
    1/4
    C.
    1
    D.
    1/2

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  9. Ball mills and tube mills with flint or porcelain balls are used for size reduction of

  10. A.
    asbestos
    B.
    rubber
    C.
    non-metallic ores
    D.
    limestone

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  11. Size reduction of __________ is accomplished in steam heated rollers and roll crushers.

  12. A.
    resins
    B.
    gums
    C.
    hard rubber
    D.
    waxes

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  13. The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the __________ of the belt.

  14. A.
    speed
    B.
    thickness
    C.
    length
    D.
    none of these

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  15. Which of the following is not a part of the Blake jaw crusher?

  16. A.
    Hanger
    B.
    Check plates
    C.
    Toggles
    D.
    Pitman

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  17. If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the

  18. A.
    sedimentation
    B.
    flocculation
    C.
    dispersion
    D.
    centrifugation

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  19. Filter aid is used to

  20. A.
    increase the rate of filtration.
    B.
    decrease the pressure drop.
    C.
    increase the porosity of the cake.
    D.
    act as a support base for the septum.

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