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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by

  2. A.

     dQ/Q = 3/2 × (dH/H)

    B.

     dQ/Q = 2 × (dH/H)

    C.

     dQ/Q = 5/2 × (dH/H)

    D.

     dQ/Q = 3 × (dH/H)

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  3. The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by

  4. A.

     dQ/Q = (1/2) × (dH/H)

    B.

     dQ/Q = (3/4) × (dH/H)

    C.

     dQ/Q = (dH/H)

    D.

     dQ/Q = (3/2) × (dH/H)

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  5. According to Bernoulli's equation

  6. A.

     Z + p/w + v²/2g = constant

    B.

     Z + p/w - v²/2g = constant

    C.

     Z - p/w + v²/2g = constant

    D.

     Z - p/w - v²/2g = constant

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  7. Which of the following instruments is used to measure flow on the application of Bernoulli's theorem?

  8. A.

     Venturimeter

    B.

     Orifice plate

    C.

     Nozzle

    D.

     All of the above

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  9. Ratio of inertia force to surface Jension is known as

  10. A.

     Mach number

    B.

     Froude number

    C.

     Reynolds’s number

    D.

     Weber’s number

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  11. The ratio of absolute viscosity to mass density is known as

  12. A.

     Specific viscosity

    B.

     Viscosity index

    C.

     Kinematic viscosity

    D.

     Coefficient of viscosity

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  13. The velocity at which the flow changes from laminar flow to turbulent flow is called

  14. A.

     Critical velocity

    B.

     Velocity of approach

    C.

     Sub-sonic velocity

    D.

     Super-sonic velocity

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  15. Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)

  16. A.

     Cc × Cv

    B.

     Cc × Cr

    C.

     Cv × Cr

    D.

     Cc/Cr

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  17. An average value of coefficient of velocity is

  18. A.

     0.62

    B.

     0.76

    C.

     0.84

    D.

     0.97

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  19. A flow through an expanding tube at constant rate is called

  20. A.

     Steady uniform flow

    B.

     Steady non-uniform flow

    C.

     Unsteady uniform flow

    D.

     Unsteady non-uniform flow

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