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Civil Engineering :: Hydraulics

  1. The valve closure is said to be sudden if

  2. A.

    t lessthan \( \frac { L } { C } \)

    B.

    t lessthan \( \frac {2 L } { C } \)

    C.

    t less than \( \frac { 3L } { C } \)

    D.

    t less than \( \frac { 5L } { C } \)


  3. If Re is the Renold's number, the coefficient of friction for laminar flow is

  4. A.

    \(\frac { 4 } { Re} \)

    B.

    \(\frac { 8 } { Re} \)

    C.

    \(\frac { 12 } { Re} \)

    D.

    \(\frac { 16 } { Re} \)


  5. The length of pipe is L, velocity of flow of a liquid in the pipe is V. If t is the time in second required to close the valve, the head of pressure

  6. A.

    H = \(\frac { LV } { gt } \)

    B.

    H = \(\frac { Lt } { Vg } \)

    C.

    \(\frac { LV^2 } { gt} \)

    D.

    none of these.


  7. For critical depth of flow of water in open channels, fc the specific energy must be :

  8. A.

    minimum

    B.

    maximum

    C.

    average of maximum and minimum

    D.

    None of these.


  9. Kinematic viscosity of liquids by equation  V = 0.0022t-\( \frac { 1.8 } { t } \)is determined by :

  10. A.

    Redwood viscometer

    B.

    Engler viscometer

    C.

    Saybolt universal viscometer

    D.

    None of these.


  11. If the forces are due to inertia and gravity, and frictional resistance plays only a minor role, the design of the channels is made by comparing

  12. A.

    Reynold number

    B.

    Froude number

    C.

    Weber number

    D.

    Mach number.


  13. The discharge over a Cipolletti weir of length 2.185 m when the head over the weir is 1 m, is

  14. A.

    2.0 m3

    B.
    2.5 m3
    C.

    3.0 m3

    D.

    4.0 m3.


  15. The velocity of the fluid particle at the centre of the pipe section, is

  16. A.

    minimum

    B.
    maximum
    C.

    equal throughout

    D.

    none of these.


  17. Due to decrease of diameter of the droplet, inside pressure intensity

  18. A.

    increases

    B.

    decreases

    C.

    remains unaffected

    D.

    None of these.


  19. In order to avoid capillary correction, the minimum diameter of a manometer used for measuring pressure, should be

  20. A.
    2 mm
    B.

    4 mm

    C.
    6 mm
    D.

    8 mm

    E.
    10 mm.