Home / Mechanical Engineering / Hydraulics and Fluid Mechanics in ME :: section-1

Mechanical Engineering :: Hydraulics and Fluid Mechanics in ME

  1. The centre of pressure for a vertically immersed surface lies at a distance equal to __________ the centre of gravity.

  2. A.

     IG / Ax̅ below

    B.

     IG / Ax̅ above

    C.

     Ax̅ / IG below

    D.

     Ax̅ / IG above


  3. The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called

  4. A.

     Density of liquid

    B.

     Specific gravity of liquid

    C.

     Compressibility of liquid

    D.

     Surface tension of liquid


  5. According to Bazin's formula, the discharge over a rectangular weir is mL2g x H3/2 where m is equal to

  6. A.

     0.405 + (0.003/H)

    B.

     0.003 + (0.405/H)

    C.

     0.405 + (H/0.003)

    D.

     0.003 + (H/0.405)


  7. In an isothermal atmosphere, the pressure

  8. A.

     Decreases linearly with elevation

    B.

     Remain constant

    C.

     Varies in the same way as the density

    D.

     Increases exponentially with elevation


  9. Rain drops are spherical because of

  10. A.

     Viscosity

    B.

     Air resistance

    C.

     Surface tension forces

    D.

     Atmospheric pressure


  11. Surface energy per unit area of a surface is numerically equal to

  12. A.

     Atmospheric pressure

    B.

     Surface tension

    C.

     Force of adhesion

    D.

     Force of cohesion


  13. The coefficient of discharge in case of internal mouthpiece is __________ that of external mouthpiece.

  14. A.

     Less than

    B.

     More than

    C.

     Equal to

    D.

     None of these


  15. In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be

  16. A.

     Double

    B.

     Four times

    C.

     Eight times

    D.

     Sixteen times


  17. In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

  18. A.

     Double

    B.

     Four times

    C.

     Eight times

    D.

     Sixteen times


  19. To avoid an interruption in the flow of a siphon, an air vessel is provided

  20. A.

     At the inlet

    B.

     At the outlet

    C.

     At the summit

    D.

     At any point between inlet and outlet