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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface)

  2. A.

     w

    B.

     wh

    C.

     w/h

    D.

     h/w


  3. The intensity of pressure at any point, in a liquid, is __________ to the depth of liquid from the surface.

  4. A.

     Equal

    B.

     Directly proportional

    C.

     Inversely proportional

    D.

     None of these


  5. The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is

  6. A.

     ρ ω2 r2

    B.

     2ρ ω2 r2

    C.

     ρ ω2 r2/2

    D.

     ρ ω2 r2/4


  7. The impeller of a centrifugal pump may have

  8. A.

     Volute casing

    B.

     Volute casing with guide blades

    C.

     Vortex casing

    D.

     Any one of these


  9. For very great pressures, viscosity of moss gases and liquids

  10. A.

     Remain same

    B.

     Increases

    C.

     Decreases

    D.

     Shows erratic behavior


  11. In a Kaplan turbine runner, the numbers of blades are generally between

  12. A.

     2 to 4

    B.

     4 to 8

    C.

     8 to 16

    D.

     16 to 24


  13. In a Francis turbine runner, the numbers of blades are generally between

  14. A.

     2 to 4

    B.

     4 to 8

    C.

     8 to 16

    D.

     16 to 24


  15. A nozzle is generally made of

  16. A.

     Cylindrical shape

    B.

     Convergent shape

    C.

     Divergent shape

    D.

     Convergent-divergent shape


  17. The unit discharge through the turbine is

  18. A.

     Q/√H

    B.

     Q/H

    C.

     Q/H3/2

    D.

     Q/H²


  19. A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is

  20. A.

     4.5 kN/m3

    B.

     6 kN/m3

    C.

     7.5 kN/m3

    D.

     10 kN/m3