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Chemical Engineering :: Mechanical Operations

  1. Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an

  2. A.
    air filter
    B.
    bag filter
    C.
    venturi scrubber
    D.
    hydrocyclones

  3. Which of the following is a coarse crusher?

  4. A.
    Smooth roll crusher
    B.
    Toothed roll crusher
    C.
    Gyratory crusher
    D.
    Tube mill

  5. Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their

  6. A.
    particle sizes
    B.
    densities
    C.
    terminal velocities
    D.
    none of these

  7. Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called

  8. A.
    classification
    B.
    froth floatation
    C.
    thickening
    D.
    clarification

  9. The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)

  10. A.
    ∝ ΔP
    B.
    ∝ 1/ ΔP
    C.
    ΔP
    D.
    independent of ΔP

  11. To produce talcum powder, use

  12. A.
    ball mill
    B.
    hammer mill
    C.
    jet mill
    D.
    pin mill

  13. Angle of nip of the crushing rolls does not depend upon the

  14. A.
    diameter of the rolls
    B.
    speed of the rolls
    C.
    product size
    D.
    feed size

  15. Paddle agitator

  16. A.
    is suitable for mixing low viscosity liquids.
    B.
    produces axial flow.
    C.
    moves at very high speed.
    D.
    none of these.

  17. Pick out the wrong statement.

  18. A.
    More commonly used jaw crusher between Dodge jaw crusher and Blake jaw crusher is the later one.
    B.
    There are only four methods namely compression, impact, attrition and cutting, which the size reduction equipments employ.
    C.
    Cutting machines mainly employ 'attrition' for size reduction of solids.
    D.
    Operating principles of Dodge and Blake jaw crushers are combined in the working of universal jaw crushers.

  19. Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor.

  20. A.
    drag
    B.
    ribbon
    C.
    screw
    D.
    slat