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Civil Engineering :: Hydraulics

  1. The horizontal component of the force on a curved surface is equal to

  2. A.

    weight of liquid vertically below the curved surface

    B.
    force on a vetical projection of the curved surface
    C.

    product of pressure at its centroid and the area

    D.

    weight of liquid retained by the curved area.


  3. The radius of gyration of the water line of a floating ship is 4 m and its metacentric height is 72.5 cm. The period of oscillation of the ship, is

  4. A.
    π
    B.
    C.

    D.
    E.

    π/2


  5. A pipe consisting of several pipes of varying diameters and lengths, may be replaced by an equivalent pipe of diameter D of length

  6. A.

    L = \(D^4\) [ \(\frac { l1 } { d1^4 } \)+\(\frac { l2 } { d2^4 } \)+\(\frac { l3 } { d3^4 } \)+......]

    B.

    L =\(D^3\) [\(\frac { l1 } { d1^3} \)+\(\frac { l2 } { d2^3 } \)+\(\frac { l3 } { d3^3 } \)+......]

    C.

    L = \(D^5\)\(\frac { l1 } { d1^5 } \)+\(\frac { l2 } { d2^5 } \)+\(\frac { l3 } { d3^5 } \)+......]

    D.

    L = \(D^2\)\(\frac { l1 } { d1^2 } \)+\(\frac { l2 } { d2^2 } \)+\(\frac { l3 } { d3^2} \)+.....]


  7. The Empirical formula Q = [.405-\(\frac { 0.003 } { Q } \)\(\sqrt2gH^3/2{}\)for discharge over large rectangular weirs, is known as

  8. A.

    Francis formula

    B.

    Bazin formula

    C.

    Rehbook formula

    D.

    Kutter's formula.


  9. The diameter (d) of a nozzle fixed at the end of a pipe (diameter D, length L) for maximum energy, is

  10. A.

    \( 3\sqrt \frac { D^3} { 8fL } \)

    B.

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

    C.

    \( 4\sqrt \frac { D^2} { 8fL } \)

    D.

    \(\sqrt \frac { D^2} { 4fL } \)


  11. Pick up the correct statement regarding Borda's mouth piece running full from the following :

  12. A.

    Actual velocity at the out let is\(\sqrt{gH}\)

    B.

    Theoretical velocity at the outlet is \(\sqrt{2gH}\)

    C.

    Coefficient of velocity is \(1/\sqrt{2}\)

    D.

    Coefficient of contraction is 1

    E.

    All the above.


  13. Differential manometers are used to measure

  14. A.

    pressure in water channels, pipes, etc.

    B.

    difference in pressure at two points

    C.
    atmospheric pressure
    D.

    very low pressure.


  15. A tank 4m x 3m x 2m containing an oil of specific gravity 0.83 is moved with an acceleration g/2 m sec2. The ratio of the pressures at its bottom when it is moving vertically up and down, is

  16. A.

    2

    B.

    3

    C.

    1/2

    D.

    1/3


  17. The most familiar form of Bernoulli's equation, is

  18. A.

    \(\frac { P1 } { w } \)+z1 +\(\frac { V1^2 } { 2g }\)+\(\frac { P2 } { w } \)+z2+\(\frac { V2^2 } { 2g }\)

    B.

    \( \frac { d\rho } {\rho}\)+g.dz+vdv = 0

    C.

    \( \frac { p } { w } \)+z +\(\frac { V^2 } { 2g }\)]any section = constant head 

    D.

    none of these.


  19. Highest dam in India, is

  20. A.

    Bhakra dam

    B.

    Hirakund dam

    C.

    Nagarjuna Sagar dam

    D.

    Iddiki dam.