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Chemical Engineering :: Mechanical Operations

  1. Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its

  2. A.
    easier grindability
    B.
    poor grindability
    C.
    high power consumption in grinding
    D.
    none of these

  3. Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm)

  4. A.
    0.01 L.S
    B.
    0.087 L.S
    C.
    L.S
    D.
    L.S/0.087

  5. Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.

  6. A.
    filtering
    B.
    washing
    C.
    drying
    D.
    all (a), (b) & (c)

  7. General crushing equation is given by . Bond's crushing law isobtained by solving this equation for n = __________ and feed of infinite size.

  8. A.
    1
    B.
    1.5
    C.
    2
    D.
    2.5

  9. Which of the follwoing mechanical conveyors does not come under the division 'scrapers' ?

  10. A.
    Ribbon conveyor
    B.
    Flight conveyor
    C.
    Bucket elevators
    D.
    Drag conveyor.

  11. __________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution.

  12. A.
    Tumbler
    B.
    Banbery
    C.
    Muller
    D.
    Rubbon blender

  13. Which of the following mechanical conveyors does not come under the division 'carriers' ?

  14. A.
    Belt conveyor
    B.
    Bucket elevator
    C.
    Screw conveyor
    D.
    Apron conveyor.

  15. Screen capacity is not a function of

  16. A.
    its openings size.
    B.
    screening mechanism.
    C.
    screening surface.
    D.
    atmospheric humidity.

  17. Which of the following is a vacuum filter ?

  18. A.
    Filter press
    B.
    Rotary disc filter
    C.
    Batch basket centrifuge
    D.
    Tank filter (Nutsch filter)

  19. Pine oil used in froth floatation technique acts as a/an

  20. A.
    collector
    B.
    modifier
    C.
    frother
    D.
    activator