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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.

  2. A.

     The bodies A and B have equal stability

    B.

     The body A is more stable than body B

    C.

     The body B is more stable than body A

    D.

     The bodies A and B are unstable


  3. Kinematic viscosity is equal to

  4. A.

     Dynamic viscosity/density

    B.

     Dynamic viscosity × density

    C.

     Density/dynamic viscosity

    D.

     1/dynamic viscosity × density


  5. A fluid having no viscosity is known as

  6. A.

     Real fluid

    B.

     Ideal fluid

    C.

     Newtonian fluid

    D.

     Non-Newtonian fluid


  7. The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.

  8. A.

     One-half

    B.

     One-third

    C.

     Two-third

    D.

     None of these


  9. The total head of a liquid particle in motion is equal to

  10. A.

     Pressure head + kinetic head + potential head

    B.

     Pressure head - (kinetic head + potential head)

    C.

     Potential head - (pressure head + kinetic head)

    D.

     Kinetic head - (pressure head + potential head)


  11. The total energy of a liquid particle in motion is equal to

  12. A.

     Pressure energy + kinetic energy + potential energy

    B.

     Pressure energy - (kinetic energy + potential energy)

    C.

     Potential energy - (pressure energy + kinetic energy

    D.

     Kinetic energy - (pressure energy + potential energy)


  13. The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

  14. A.

     40%

    B.

     50%

    C.

     60%

    D.

     80%


  15. The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

  16. A.

     μ π³ N² R² /1800 t

    B.

     μ π³ N² R⁴ /1800 t

    C.

     μ π³ N² R² /3600 t

    D.

     μ π³ N² R⁴ /3600 t


  17. The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel)

  18. A.

     (q/g)1/2

    B.

     (q²/g)1/3

    C.

     (q³/g)1/4

    D.

     (q⁴/g)1/5


  19. The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the

  20. A.

     Pressure head

    B.

     Velocity head

    C.

     Pressure head + velocity head

    D.

     Pressure head - velocity head