Fluid mechanics and hydraulics miscellaneous

Fluid mechanics and hydraulics miscellaneous

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Fluid Mechanics and Hydraulics

Fluid mechanics and hydraulics miscellaneous
  1. A tank and a deflector are placed on a frictionless trolley. The tank issues water jet (mass density of water = 1000 kg/m3), which strikes the deflector and turns by 45°. If the velocity of jet leaving the deflector is 4 m/s and discharge is 0.1 m3 /s, the force recorded by the spring will be









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    Horizontal component of force exented by jet, Fx
    = force on spring balance = ρAV2 cosθ
    = ρQV cosθ
    = 1000 × 0.1 × 4 × cos 45°
    = 200 √2 N

    Correct Option: D

    Horizontal component of force exented by jet, Fx
    = force on spring balance = ρAV2 cosθ
    = ρQV cosθ
    = 1000 × 0.1 × 4 × cos 45°
    = 200 √2 N

  1. The height of a hydraulic jump in the stilling pool of 1.25 scale model was observed to the 10 cm. The corresponding prototype height of the jump is








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    Lr = 1.25

    Lr =
    hm
    hp

    1
    		 =
    10
    25hp

    ⇒ hp = 250 cm = 2.5 m

    Correct Option: B

    Lr = 1.25

    Lr =
    hm
    hp

    1
    		 =
    10
    25hp

    ⇒ hp = 250 cm = 2.5 m

  1. The reading of differential manometer of a Venturimeter, placed at 45° to the horizontal is 11 cm. If the Venturimeter is turned to horizonal position, the manometer reading will be.








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    The indication of pipe does not affect the recading of the manometer, since it measure pressure difference between two points and will not change with orientation.

    Correct Option: C

    The indication of pipe does not affect the recading of the manometer, since it measure pressure difference between two points and will not change with orientation.

  1. Cavitation is caused by








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    Bubbles are formed under low pressure which leads to cavitation.

    Correct Option: B

    Bubbles are formed under low pressure which leads to cavitation.

  1. A horizontal bed channel is followed by a sleep bed channel as shown in the figure. The gradually varied profiles over the horizontal and steep beds are








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    Second slope is more than first, therefore profiles are draw downs or 2nd profiles
    ∴ H2 and S2.

    Correct Option: A

    Second slope is more than first, therefore profiles are draw downs or 2nd profiles
    ∴ H2 and S2.