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Chemical Engineering :: Mechanical Operations

  1. Which of the following is the softest material ?

  2. A.
    Talc
    B.
    Feldspar
    C.
    Corundum
    D.
    Calcite

  3. Dry powdery solid materials are transported by a __________ conveyor.

  4. A.
    belt
    B.
    bucket
    C.
    screw
    D.
    none of these

  5. Fluid energy mill comes in the category of

  6. A.
    grinder
    B.
    crusher
    C.
    cutter
    D.
    ultrafine grinder

  7. Filtration capacity of a rotary drum vacuum filter depends upon the

  8. A.
    cake thickness.
    B.
    characteristics of the feed slurry.
    C.
    both (a) & (b).
    D.
    neither (a) nor (b).

  9. About 2-3 hp, power per gallon of a thin liquid provides vigrous agitation in an agitator. 'Power number' in agitation is given by


  10. __________ conveyors are also called scrapers.

  11. A.
    Apron
    B.
    Screw
    C.
    Helical flight
    D.
    both (b) & (c)

  12. For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid ?

  13. A.
    Kozney-Karman equation
    B.
    Leva's equation
    C.
    Blake-Plummer equation
    D.
    none of these

  14. Which of the following is a continuous filter?

  15. A.
    Plate and frame filter
    B.
    Cartridge filter
    C.
    Shell and leaf filter
    D.
    None of these

  16. During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration

  17. A.
    at time zero.
    B.
    at the end of filtration.
    C.
    when half the filtrate has been obtained.
    D.
    at the end of filtration, but decreases with time subsequently.

  18. In screen analysis, the notation +5 mm/-10 mm means particles passing through

  19. A.
    10 mm screen and retained on 5 mm screen.
    B.
    5 mm screen and retained on 10 mm screen.
    C.
    both 5 mm and 10 mm screens.
    D.
    neither 5 mm nor 10 mm screen.