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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. Dimensions of surface tension are

  2. A.

     ML°T⁻²

    B.

     ML°T

    C.

     ML r²

    D.

     ML²T²


  3. When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be

  4. A.

     Horizontal

    B.

     Nearly horizontal

    C.

     Steep

    D.

     First rise and then fall


  5. When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

  6. A.

     Horizontal

    B.

     Nearly horizontal

    C.

     Steep

    D.

     First rise and then fall


  7. Reynold's number is the ratio of the inertia force to the

  8. A.

     Surface tension force

    B.

     Viscous force

    C.

     Gravity force

    D.

     Elastic force


  9. The divergent portion of a Venturimeter is made longer than convergent portion in order to

  10. A.

     Avoid the tendency of breaking away the stream of liquid

    B.

     To minimize frictional losses

    C.

     Both (A) and (B)

    D.

     None of these


  11. Indicator diagram of a reciprocating pump is a graph between

  12. A.

     Flow vs. swept volume

    B.

     Pressure in cylinder vs. swept volume

    C.

     Flow vs. speed

    D.

     Pressure vs. speed


  13. Flow occurring in a pipeline when a valve is being opened is

  14. A.

     Steady

    B.

     Unsteady

    C.

     Laminar

    D.

     Vortex


  15. Francis turbine is best suited for

  16. A.

     Medium head application from 24 to 180 m

    B.

     Low head installation up to 30 m

    C.

     High head installation above 180 m

    D.

     All types of heads


  17. According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

  18. A.

     Directly as fan speed

    B.

     Square of fan speed

    C.

     Cube of fan speed

    D.

     Square root of fan speed


  19. The ratio of the inertia force to the viscous force is called

  20. A.

     Reynold's number

    B.

     Froude's number

    C.

     Weber's number

    D.

     Euler's number