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Civil Engineering :: Hydraulics

  1. For a long pipe, the head loss

  2. A.

    at the entrance is ignored

    B.
    at the outlet is ignored
    C.

    at the entrance and outlet both are ignored

    D.
    due to friction is ignored.

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  3. On a flow net diagram, the distance between two consecutive steam lines at two successive sections are 1 cm and 0.5 cm respectively. If the velocity at the first section is 1 m/sec, the velocity at the second is

  4. A.

    1.0 m/sec

    B.
    0.5 m/sec
    C.

    2.0 m/sec

    D.
    2.5 m/sec
    E.

    3 m/sec.

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  5.  

    If LD and f are the length, diameter and coefficient of friction of a pipe, the ratio of the areas of the pipe A and nozzle a, to transmit maximum power, is

  6. A.

    \(\sqrt\frac { 8fL^2 } { D} \)

    B.

    \(\sqrt\frac { 8L^2 f} { D} \)

    C.

    \(\sqrt\frac { 8L f} { D^2} \)

    D.

    \(\sqrt\frac { 8 fL} { D} \)

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  7. The flow is called rotational if its velocity normal to the plane of area is equal to

  8. A.

    angular velocity vector

    B.

    twice the angular velocity vector

    C.

    thrice the angular velocity vector

    D.

    none of these.

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  9.  

    Flow of water in pipes of diameter more than 3 metres, can be measured by

  10. A.
    pitot tube
    B.

    venturimeter

    C.
    orifice plate
    D.
    rotameter.

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  11. The pressure variation along the radial direction for vortex flow along a horizontal plane is related by

  12. A.

    \( \frac {\partial p } { \partial r }\) = \(-\rho\)\(\frac { V^2 } { r }\)

    B.

    \( \frac {\partial p } { \partial r }\) = \(\rho\)\(\frac { V^2 } { r }\)

    C.

    \( \frac {\partial p } { \partial r }\) = \(\rho\)\(\frac { V } { r ^2}\)

    D.

    \( \frac {\partial p } { \partial r }\) = \(\rho\) \(\frac { V^2 } { r ^2}\)

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  13.  

    Hydraulic grade line

  14. A.

    remains above the centre line of conduit

    B.

    remains below the centre line of conduit

    C.

    remains parallel to the centre line of conduit

    D.

    may be above or below the centre line of conduit.

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  15. If the Mach number for a fluid flow is less than 1, the flow is

     

  16. A.
    sonic
    B.
    supersonic
    C.

    sub-sonic

    D.

    none of these.

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  17.  

    If the Mach number for a fluid flow is less than 1, the flow is

  18. A.

    sonic

    B.

    supersonic

    C.

    sub-sonic

    D.

    none of these.

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  19. Hydraulic coefficient of an orifice means the coefficient of

  20. A.

    velocity

    B.
    contraction
    C.

    resistance

    D.

    all the above.

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