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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?

  2. A.

     Pelton wheel

    B.

     Francis turbine

    C.

     Kaplan turbine

    D.

     None of these


  3. If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its

  4. A.

     Specific weight

    B.

     Specific mass

    C.

     Specific gravity

    D.

     Specific density


  5. In a depressed nappe

  6. A.

     The pressure below the nappe is atmospheric

    B.

     The pressure below the nappe is negative

    C.

     The pressure above the nappe is atmospheric

    D.

     The pressure above the nappe is negative


  7. Free surface of a liquid tends to contract to the smallest possible area due to force of

  8. A.

     Surface tension

    B.

     Viscosity

    C.

     Friction

    D.

     Cohesion


  9. A flow in which the viscosity of fluid is dominating over the inertia force is called

  10. A.

     Steady flow

    B.

     Unsteady flow

    C.

     Laminar flow

    D.

     Turbulent flow


  11. The cavitation in reaction turbines is avoided, to a great extent by

  12. A.

     Installing the turbine below the tail race level

    B.

     Using stainless steel runner of the turbine

    C.

     Providing highly polished blades to the runner

    D.

     All of the above


  13. A Pelton wheel is

  14. A.

     Tangential flow impulse turbine

    B.

     Inward flow impulse turbine

    C.

     Outward flow impulse turbine

    D.

     Inward flow reaction turbine


  15. A perfect gas

  16. A.

     Has constant viscosity

    B.

     Has zero viscosity

    C.

     Is in compressible

    D.

     None of the above


  17. The pressure of air __________ with the increase of height from the surface of the earth.

  18. A.

     Does not change

    B.

     Decreases

    C.

     Increases

    D.

     None of these


  19. When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid

  20. A.

     Remains horizontal

    B.

     Becomes curved

    C.

     Falls on the front end

    D.

     Falls on the back end