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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. Pressure of the order of 10" torr can be measured by

  2. A.

     Bourdon tube

    B.

     Pirani Gauge

    C.

     Micro-manometer

    D.

     Ionisation gauge


  3. The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

  4. A.

     1/2 × depth

    B.

     1/2 × breadth

    C.

     1/2 × sloping side

    D.

     1/4 × (depth + breadth)


  5. The pressure of liquid at throat in a Venturimeter is __________ than that at inlet.

  6. A.

     Higher

    B.

     Lower

    C.

     Same

    D.

     None of these


  7. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

  8. A.

     Increase

    B.

     Decrease

    C.

     Remain same

    D.

     Increase/decrease depending on depth of immersion


  9. Fluid is a substance which offers no resistance to change of

  10. A.

     Pressure

    B.

     Flow

    C.

     Shape

    D.

     Volume


  11. According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

  12. A.

     Directly as the air or gas density

    B.

     Inversely as square root of density

    C.

     Inversely as density

    D.

     As square of density


  13. For centrifugal pump impeller, the maximum value of the vane exit angle is

  14. A.

     10° to 15°

    B.

     15° to 20°

    C.

     20° to 25°

    D.

     25° to 30°


  15. A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

  16. A.

     14π R1/2/15Cd × a √(2g)

    B.

     14π R3/2/15Cd × a √(2g)

    C.

     14π R5/2/15Cd × a √(2g)

    D.

     14π R7/2/15Cd × a √(2g)


  17. Choose the wrong statement. Alcohol is used in manometer, because

  18. A.

     Its vapour pressure is low

    B.

     It provides suitable meniscus for the inclined tube

    C.

     Its density is less

    D.

     It provides longer length for a given pressure difference


  19. Alcohol is used in manometers because

  20. A.

     It has low vapour pressure

    B.

     It is clearly visible

    C.

     It has low surface tension

    D.

     It can provide longer column due to low density