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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. The centre of gravity of the volume of the liquid displaced is called

  2. A.

     Centre of pressure

    B.

     Centre of buoyancy

    C.

     Metacentre

    D.

     None of these


  3. A square surface 3 m × 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is

  4. A.

     9,000 kg

    B.

     13,500 kg

    C.

     18,000 kg

    D.

     27,000 kg


  5. In a reciprocating pump, air vessels are used to

  6. A.

     Smoothen the flow

    B.

     Reduce suction head

    C.

     Increase delivery head

    D.

     Reduce acceleration head


  7. The absolute pressure is equal to

  8. A.

     Gauge pressure + atmospheric pressure

    B.

     Gauge pressure - atmospheric pressure

    C.

     Atmospheric pressure - gauge pressure

    D.

     Gauge pressure - vacuum pressure


  9. The pressure less than atmospheric pressure is known as

  10. A.

     Suction pressure

    B.

     Vacuum pressure

    C.

     Negative gauge pressure

    D.

     All of these


  11. One stoke is equal to

  12. A.

     10-2 m2/s

    B.

     10-3 m2/s

    C.

     10-4 m2/s

    D.

     10-6 m2/s


  13. The Newton's law of resistance is based on the assumption that the

  14. A.

     Planes of the body are completely smooth

    B.

     Space around the body is completely filled with the fluid

    C.

     Fluid particles do not exert any influence on one another

    D.

     All of the above


  15. When the Mach number is between __________ the flow is called super-sonic flow.

  16. A.

     1 and 2.5

    B.

     2.5 and 4

    C.

     4 and 6

    D.

     1 and 6


  17. The center of pressure of a surface subjected to fluid pressure is the point

  18. A.

     On the surface at which resultant pressure acts

    B.

     On the surface at which gravitational force acts

    C.

     At which all hydraulic forces meet

    D.

     Similar to metacentre


  19. Surface tension

  20. A.

     Acts in the plane of the interface normal to any line in the surface

    B.

     Is also known as capillarity

    C.

     Is a function of the curvature of the interface

    D.

     Decreases with fall in temperature