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Chemical Engineering :: Fluid Mechanics

  1. Pascal law is not applicable for a/an __________ fluid.

  2. A.
    accelerating frictionless
    B.
    static
    C.
    uniformly moving
    D.
    none of these

  3. In a fluidised bed reactor

  4. A.
    temperature gradients are very high.
    B.
    temperature is more or less uniform.
    C.
    hot spots are formed.
    D.
    segregation of the solids occurs.

  5. The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.

  6. A.
    steady uniform
    B.
    steady non uniform
    C.
    unsteady uniform
    D.
    unsteady non uniform

  7. Pick out the correct statement pertaining to transition/ entrance length in fluid flow.

  8. A.
    The length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is called the transition length.
    B.
    Transition length for laminar flow of Newtonion fluids in a pipe of diameter 'd' is equal to 0.05. D.NRe.
    C.
    Transition length for turbulent flow of Newtonion fluids in a smooth pipe of diameter 'd' is equal to 50 D.
    D.
    all (a), (b) and (c).

  9. A perfect gas

  10. A.
    does not satisfy PV = nRT.
    B.
    is incompressible and has zero viscosity.
    C.
    has constant specific heat.
    D.
    can't develop shear stresses.

  11. In a/an __________ , the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure.

  12. A.
    rotameter
    B.
    pitot tube
    C.
    venturimeter
    D.
    flow nozzle

  13. During fluid flow, variation of shear stress(τ) with velocity gradientat constant pressure temperature is shown below in the figure

    In the above figure, Binghom plastic is represented by the curve .

  14. A.
    V
    B.
    II
    C.
    III
    D.
    I

  15. Speed of sound in an ideal gas depends on its

  16. A.
    temperature
    B.
    pressure
    C.
    specific volume
    D.
    none of these

  17. A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp).

  18. A.
    less head & capacity
    B.
    more head
    C.
    more capacity
    D.
    less head & more capacity

  19. If 'x' is the depth of flow in an open channel of large width, then the hydraulic radius is equal to

  20. A.
    x
    B.
    x/2
    C.
    x/3
    D.
    2x/3