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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. Stoke is the unit of

  2. A.

     Kinematic viscosity in C. G. S. units

    B.

     Kinematic viscosity in M. K. S. units

    C.

     Dynamic viscosity in M. K. S. units

    D.

     Dynamic viscosity in S. I. units


  3. The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to

  4. A.

     2,100

    B.

     2,700

    C.

     10,000

    D.

     21,000


  5. Head developed by a centrifugal pump depends on

  6. A.

     Impeller diameter

    B.

     Speed

    C.

     Fluid density

    D.

     Both (A) and (B) above


  7. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm", the pressure at a depth of 50 m below the oil surface will be

  8. A.

     2 meters of water column

    B.

     3 meters of water column

    C.

     5 meters of water column

    D.

     6 meters of water Column


  9. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be

  10. A.

     2 metres of water column

    B.

     3 metres of water column

    C.

     3.5 metres of water column

    D.

     4 m of water column


  11. If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be

  12. A.

     Higher than the surface of liquid

    B.

     The same as the surface of liquid

    C.

     Lower than the surface of liquid

    D.

     Unpredictable


  13. Hydraulic accumulator is used for

  14. A.

     Accumulating oil

    B.

     Supplying large quantities of oil for very short duration

    C.

     Generally high pressures to operate hydraulic machines

    D.

     Supplying energy when main supply fails


  15. A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used?

  16. A.

     1 : 5

    B.

     1 : 2.5

    C.

     1 : 25

    D.

     1 : ?5


  17. In axial flow fans and turbines, fluid enters and leaves as follows

  18. A.

     Radially, axially

    B.

     Axially, radially

    C.

     Axially, axially

    D.

     Radially, radially


  19. During the opening of a valve in a pipe line, the flow is

  20. A.

     Steady

    B.

     Unsteady

    C.

     Uniform

    D.

     Laminar