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Chemical Engineering :: Mechanical Operations

  1. Cartridge filters are termed as 'edge' filters, because of the fact that the

  2. A.
    disks have very sharp edge.
    B.
    solids are not deposited at the edge of the disk.
    C.
    bulk of the solids are removed at the periphery of the disks.
    D.
    none of these.

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  3. Vibrating screens have capacity in the range of __________ tons/ft2 .mm mesh size.

  4. A.
    0.2 to 0.8
    B.
    5 to 25
    C.
    50 to 100
    D.
    100 to 250

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  5. Cumulative analysis for determining surface is more precise than differential analysis, because of the

  6. A.
    assumption that all particles in a single fraction are equal in size.
    B.
    fact that screening is more effective.
    C.
    assumption that all particles in a single fraction are equal in size, is not needed.
    D.
    none of these.

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  7. To remove very small amount of tiny solid impurities from liquid, we use a

  8. A.
    pressure filter
    B.
    vacuum filter
    C.
    centrifugal filter
    D.
    coagulant

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  9. Screw conveyors are

  10. A.
    run at very high rpm.
    B.
    suitable for sticky materials.
    C.
    suitable for highly abrasive materials.
    D.
    all (a), (b) and (c)

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  11. __________ mills fall in the category of tumbling mills,

  12. A.
    Ball and pebble
    B.
    Rod and tube
    C.
    Compartment
    D.
    all (a), (b) & (c)

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  13. Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m3)

  14. A.
    3.6 W.D.V
    B.
    3.6 W.D.V.
    C.
    3.6 W.V
    D.
    3.6 D.V

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  15. Which of the following is not a cutting machine?

  16. A.
    Dicers
    B.
    Knife cutters
    C.
    Slitters
    D.
    Tube mills

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  17. Weber number is significant and is concerned with the

  18. A.
    solid-liquid mixing.
    B.
    liquid-liquid mixing.
    C.
    dispersion of liquid in liquid.
    D.
    suspension of solid in liquid.

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  19. Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.

  20. A.
    viscosity
    B.
    thermal conductivity
    C.
    surface tension
    D.
    density

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