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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. Uniform flow occurs when

  2. A.

     The direction and magnitude of the velocity at all points are identical

    B.

     The velocity of successive fluid particles, at any point, is the same at successive periods of time

    C.

     The magnitude and direction of the velocity do not change from point to point in the fluid

    D.

     The fluid particles move in plane or parallel planes and the streamline patterns are identical in each pleasure


  3. Which place in hydraulic turbine is most susceptible for cavitations?

  4. A.

     Inlet of draft rube

    B.

     Blade inlet

    C.

     Guide blade

    D.

     Penstock


  5. Which of the following pump is successfully used for lifting water from deep wells?

  6. A.

     Centrifugal pump

    B.

     Reciprocating pump

    C.

     Jet pump

    D.

     Air lift pump


  7. Impulse turbine is generally fitted

  8. A.

     At the level of tail race

    B.

     Little above the tail race

    C.

     Slightly below the tail race

    D.

     About 2.5 m above the tail race to avoid cavitations


  9. A metal with specific gravity of 'a' floating in a fluid of same specific gravity 'a' will

  10. A.

     Sink to bottom

    B.

     Float over fluid

    C.

     Partly immersed

    D.

     Be fully immersed with top surface at fluid surface


  11. A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be

  12. A.

     2A × √H₁/Cd × a × √(2g)

    B.

     2A × √H₂/Cd × a × √(2g)

    C.

     2A × (√H₁ - √H₂)/Cd × a × √(2g)

    D.

     2A × (√H3/2 - √H3/2)/Cd × a × √(2g)


  13. Surface tension has the units of

  14. A.

     Newton-sec/m

    B.

     Newton-m/sec

    C.

     Newton/m

    D.

     Newton


  15. A Francis turbine is used when the available head of water is

  16. A.

     0 to 25 m

    B.

     25 m to 250 m

    C.

     Above 250 m

    D.

     None of these


  17. According to Bernoulli's equation for steady ideal fluid flow

  18. A.

     Principle of conservation of mass holds

    B.

     Velocity and pressure are inversely proportional

    C.

     Total energy is constant throughout

    D.

     The energy is constant along a streamline but may vary across streamlines


  19. Pressure intensifier increases the pressure in proportion to

  20. A.

     Ratio of diameters

    B.

     Square of ratio of diameters

    C.

     Inverse ratio of diameters

    D.

     Square of inverse ratio of diameters