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Chemical Engineering :: Fluid Mechanics

  1. In fluid flow, the boundary layer separation can not occur

  2. A.
    in case of boundaries experiencing form drag.
    B.
    at points of abrupt changes in the flow directions.
    C.
    in laminar flow.
    D.
    none of these.

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  3. For a given fluid flow rate, which of the following incurs maximum head loss ?

  4. A.
    Orifice meter
    B.
    Venturimeter
    C.
    Flow nozzle
    D.
    All of them incur the same head loss

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  5. Which of the following assumptions enables the Euler's equation of motion to be integrated ?

  6. A.
    The fluid is incompressible.
    B.
    The fluid is non-viscous.
    C.
    The continuity equation is satisfied.
    D.
    The flow is rotational and incompressible.

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  7. In case of a pipe exit fitted with a nozzle, the

  8. A.
    conversion of kinetic head to pressure head is facilitated.
    B.
    conversion of pressure head to kinetic head is facilitated.
    C.
    power transmitted through the nozzle is maximum, when the head lost due to friction in the pipe is equal to one third of the total supply head.
    D.
    both (b) and (c)

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  9. A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid.

  10. A.
    Newtonion
    B.
    viscous
    C.
    dilatant
    D.
    non-viscous

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  11. Which of the following is the most common pump for pumping either raw sewage or sludge ?

  12. A.
    Electromagnetic pump
    B.
    Centrifugal pump
    C.
    Reciprocating pump
    D.
    Gear pump

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  13. Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter.

  14. A.
    5
    B.
    50
    C.
    500
    D.
    1000

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  15. Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have

  16. A.
    very low speeds.
    B.
    smaller discharge.
    C.
    higher capital &maintenance cost.
    D.
    high vibrations.

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  17. Which is the correct relationship for a centrifugal pump ? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)

  18. A.
    D = 1840 H0.5/N
    B.
    D = 1840 N/H0.5
    C.
    H = 1840 D0.5/N
    D.
    D = 1840 H/N

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  19. Which of the following pipe bends will incur the largest head loss ?

  20. A.
    U-bend
    B.
    30° bend
    C.
    45° bend
    D.
    90° bend

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