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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

  2. A.

     Slow speed with radial flow at outlet

    B.

     Medium speed with radial flow at outlet

    C.

     High speed with radial flow at outlet

    D.

     High speed with mixed flow at outlet


  3. Which of the following pump is successfully used for lifting water to the turbines?

  4. A.

     Centrifugal pump

    B.

     Reciprocating pump

    C.

     Jet pump

    D.

     Air lift pump


  5. Which of the following statement is correct as regard to water wheels?

  6. A.

     They have slow speeds

    B.

     They are suitable even for low water heads

    C.

     They give constant efficiency, even if the discharge is not constant

    D.

     All of the above


  7. The kinematic viscosity is the

  8. A.

     Ratio of absolute viscosity to the density of the liquid

    B.

     Ratio of density of the liquid to the absolute viscosity

    C.

     Product of absolute viscosity and density of the liquid

    D.

     Product of absolute viscosity and mass of the liquid


  9. The viscosity of water at 20°C is

  10. A.

     One stoke

    B.

     One centistoke

    C.

     One poise

    D.

     One centipoise


  11. A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is

  12. A.

     (bd²/12) + x̅

    B.

     (d²/12 x̅) + x̅

    C.

     b²/12 + x̅

    D.

     d²/12 + x̅


  13. The sheet of water flowing over a notch or a weir is known as

  14. A.

     Sill or crest

    B.

     Nappe or vein

    C.

     Orifice

    D.

     None of these


  15. When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

  16. A.

     Narrow-crested weir

    B.

     Broad-crested weir

    C.

     Ogee weir

    D.

     Submerged weir


  17. The pressure in Pascal’s at a depth of 1 m below the free surface of a body of water will be equal to

  18. A.

     1 Pa

    B.

     91 Pa

    C.

     981 Pa

    D.

     9810 Pa


  19. The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is

  20. A.

     Directly proportional to (radius)2

    B.

     Inversely proportional to (radius)2

    C.

     Directly proportional to (radius)4

    D.

     Inversely proportional to (radius)4