Home / Mechanical Engineering / Hydraulics and Fluid Mechanics :: section-5

Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

  2. A.

     Slow speed pump with radial flow at outlet

    B.

     Medium speed pump with radial flow at outlet

    C.

     High speed pump with radial flow at outlet

    D.

     High speed pump with axial flow at outlet


  3. A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit speed of the wheel is

  4. A.

     10 r.p.m.

    B.

     20 r.p.m.

    C.

     40 r.p.m.

    D.

     80 r.p.m.


  5. An orifice is said to be large, if

  6. A.

     The size of orifice is large

    B.

     The velocity of flow is large

    C.

     The available head of liquid is more than 5 times the height of orifice

    D.

     The available head of liquid is less than 5 times the height of orifice


  7. A flow in which __________ force is dominating over the viscosity is called turbulent flow.

  8. A.

     Elastic

    B.

     Surface tension

    C.

     Viscous

    D.

     Inertia


  9. Which of the following meters is not associated with viscosity?

  10. A.

     Red wood

    B.

     Say bolt

    C.

     Engler

    D.

     Orsat


  11. The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)

  12. A.

     (1 + cos φ)/2

    B.

     (1 - cos φ)/2

    C.

     (1 + sin φ)/2

    D.

     (1 - sin φ)/2


  13. According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)

  14. A.

     flv²/2gd

    B.

     flv²/gd

    C.

     3flv²/2gd

    D.

     4flv²/2gd


  15. A flow whose streamline is represented by a straight line, is called __________ dimensional flow.

  16. A.

     One

    B.

     Two

    C.

     Three

    D.

     Four


  17. Which of the following pump is suitable for small discharge and high heads?

  18. A.

     Centrifugal pump

    B.

     Axial flow pump

    C.

     Mixed flow pump

    D.

     Reciprocating pump


  19. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

  20. A.

     Force of adhesion

    B.

     Force of cohesion

    C.

     Force of friction

    D.

     Force of diffusion