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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to

  2. A.

     10 kg

    B.

     100 kg

    C.

     1000 kg

    D.

     1 kg


  3. Specific weight of water in S.I. units is equal to

  4. A.

     1000 N/m3

    B.

     10000 N/m3

    C.

     9.81 × 103 N/m3

    D.

     9.81 × 10⁶ N/m3


  5. The specific weight of water in S.I. units is taken as

  6. A.

     9.81 kN/m3

    B.

     9.81 × 103 N/m3

    C.

     9.81 × 10-6 N/mm3

    D.

     Any one of these


  7. A flow is called super-sonic if the

  8. A.

     Velocity of flow is very high

    B.

     Discharge is difficult to measure

    C.

     Mach number is between 1 and 6

    D.

     None of these


  9. One liter of water occupies a volume of

  10. A.

     100 cm3

    B.

     250 cm3

    C.

     500 cm3

    D.

     1000 cm3


  11. The variation in the volume of a liquid with the variation of pressure is called its

  12. A.

     Surface tension

    B.

     Compressibility

    C.

     Capillarity

    D.

     Viscosity


  13. The unit of surface tension is

  14. A.

     N/m

    B.

     N/m2

    C.

     N/m3

    D.

     N-m


  15. Unit of surface tension is

  16. A.

     Energy/unit area

    B.

     Velocity/unit area

    C.

     Both of the above

    D.

     It has no units


  17. Hydrometer is used to determine

  18. A.

     Specific gravity of liquids

    B.

     Specific gravity of solids

    C.

     Specific gravity of gases

    D.

     Relative humidity


  19. The units of dynamic or absolute viscosity are

  20. A.

     Metres² per sec

    B.

     kg sec/meter

    C.

     Newton-sec per meter

    D.

     Newton-sec² per meter