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Chemical Engineering :: Fluid Mechanics

  1. With increase in pump speed, its NPSH requirement

  2. A.
    decreases
    B.
    increases
    C.
    remains unaltered
    D.
    can either increase or decrease ; depends on other factors

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  3. In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.

  4. A.
    directly proportional to
    B.
    inversely proportional to
    C.
    inversely proportional to the square root of
    D.
    independent of

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  5. Gear pump

  6. A.
    is a positive displacement pump.
    B.
    is a centrifugal pump.
    C.
    is a non-positive displacement pump.
    D.
    can be started with delivery valve closed.

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  7. Most of the centrifugal pumps used in chemical plants are usually __________ driven.

  8. A.
    steam
    B.
    diesel engine
    C.
    electric motor
    D.
    gas turbine

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  9. Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the

  10. A.
    back flow of fluid in the event of stoppage of pump.
    B.
    discharge pressure.
    C.
    flow of liquid during operation of the pump.
    D.
    all (a), (b) and (c).

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  11. Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an

  12. A.
    weir
    B.
    hot wire anemometer
    C.
    cup and vane aneometer
    D.
    none of these

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  13. The time taken for gravity flow of a fixed volume of liquid (as in Redwood viscometer) is directly proportional to its

  14. A.
    absolute viscosity.
    B.
    ratio of absolute viscosity to density.
    C.
    density.
    D.
    Reynolds number.

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  15. The exit cone angle in case of a standard venturimeter is __________ the entrance cone angle.

  16. A.
    smaller than
    B.
    greater than
    C.
    equal to
    D.
    either (a) or (b)

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  17. Sewage sludge is __________ type of non-Newtonion fluid.

  18. A.
    dilatant
    B.
    Bingham plastic
    C.
    Pseudo plastic
    D.
    none of these

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  19. Ratio of pressure and inertia force gives __________ number.

  20. A.
    Weber
    B.
    Mach
    C.
    Euler
    D.
    Froude

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