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Chemical Engineering :: Mechanical Operations

  1. Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher.

  2. A.
    Blake jaw
    B.
    toothed roll
    C.
    gyratory
    D.
    none of these.

  3. A filter press is

  4. A.
    a batch filter.
    B.
    not suitable, if the liquid is the main product.
    C.
    having prohibitively high maintenance cost.
    D.
    not suitable for wide range of materials under varying operating conditions of cake thickness and pressure.

  5. Xanthates are used in the froth floatation process as a/an

  6. A.
    conditioner
    B.
    frother
    C.
    collector
    D.
    activator

  7. The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is

  8. A.
    2
    B.
    2
    C.
    1.5
    D.
    3

  9. Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).


  10. Limestone is normally crushed in a

  11. A.
    roll crusher
    B.
    hammer crusher
    C.
    ball mill
    D.
    tube mill

  12. Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to __________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance ).

  13. A.
    μ
    B.
    1/μ
    C.
    1/μ
    D.
    1/μ2

  14. Pick out the correct statement.

  15. A.
    The capacity and the effectiveness of a screen are the same.
    B.
    The capacity and the effectiveness of screen are opposing factors.
    C.
    The screening surface of a 'reel' (a revolving screen used in flour mills) is made of silk bolting cloth supported by wire mesh.
    D.
    both (b) and (c).

  16. The main differentiation factor between tube mill and ball mill is the

  17. A.
    length to diameter ratio.
    B.
    size of the grinding media.
    C.
    final product size.
    D.
    operating speed.

  18. Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a __________ surface.

  19. A.
    plane
    B.
    curved
    C.
    ribbed
    D.
    either (a) or (b)