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Civil Engineering :: Hydraulics

  1. Water flows through a convergent mouthpiece of diameter 4 cm at convergence under a head of 3 metres. If the maximum vacuum pressure is 9 metres of water, the maximum diameter of divergence, to aviod separation of flow, is

  2. A.

    4 cm

    B.
    6 cm
    C.

    \(\sqrt{2}\)cm

    D.

    2\(\sqrt{3}\) cm 

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  3. An ideal fluid

  4. A.

    is frictionless and incompressible

    B.

    obeys Newton's law of velocity

    C.

    is similar to gas

    D.

    is very viscous.

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  5. In C.G.S. system the units of kinematic viscosity, is

  6. A.

    stoke

    B.

    poise

    C.
    Newton
    D.

    none of these.

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  7. A triangular notch is preferred to a rectangular notch because

  8. A.

    only one reading is required

    B.

    its formula is simple to remember

    C.

    it gives more accurate results for low discharge

    D.

    it measures a wide range of flows accurately

    E.

    all the above.

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  9. In case of laminar flow through a circular pipe,

  10. A.

    momentum correction factor is 1.33

    B.

    energy correction factor is 2.00

    C.

    both (a) and (b)

    D.

    Neither (a) nor (b).

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  11. The pressure less than atmospheric , pressure, is known

  12. A.

    suction pressure

    B.

    vacuum pressure

    C.

    negative gauge pressure

    D.
    all the above.

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  13. If H is the difference of liquid levels on two sides of an orifice (width b, depth d), the discharge through the orifice will be

  14. A.

    Cdbd2\(\sqrt{2gh}\)

    B.

    Cdb2d\(\sqrt{2gh}\)

    C.

    Cdbd\(\sqrt{2gh}\)

    D.

    Cdbd.2\(H^1/2\)

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  15. A load w is rolled a distance d across the deck of a ship of weight W, due to which the ship heels through θ°. The metacentric height of the ship, is

  16. A.

    \(\frac { Wd } { Wtanθ }\)

    B.

    \(\frac { Wtanθ } { Wd }\)

    C.

    \(\frac { Wd } { Wtanθ }\)

    D.

    \(\frac { Wtanθ } { Wd }\)

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  17. A rise or fall of liquid in a glass tube of a very small diameter when dipped is

  18. A.

    directly proportional to the force per unit length of periphery

    B.

    direcly proportional to the sine of the angle of contac

    C.

    directly proportional to the specific weight of liquid

    D.

    inversely proportional to the diameter of the glass tube.

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  19. To measure very low pressure, we use

  20. A.
    barometers
    B.

    piezometers

    C.

    manometers

    D.

    differential manometers.

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