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Chemical Engineering :: Fluid Mechanics

  1. Which is the most efficient and best for measuring very small flow rate of gases ?

  2. A.
    Venturimeter
    B.
    Orifice meter
    C.
    Rotameter
    D.
    Flow nozzle

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  3. When the water is warm, the height to which it can be lifted by a pump

  4. A.
    decreases due to reduced viscosity.
    B.
    decreases due to reduced vapour pressure.
    C.
    increases due to increased vapour pressure
    D.
    decreases due to increased frictional resistance.

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  5. Pipes having diameter 14 inches or more are designated by their

  6. A.
    outside diameter
    B.
    inside diameter
    C.
    schedule number
    D.
    none of these

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  7. Viscosity of water at 40°C lies in the range of

  8. A.
    1 x 10-3 to 2 x 10-3 kg/m.s
    B.
    0.5 x 10-3 to 1 x 10-3 kg/m.s
    C.
    1 to 2 kg/m.s
    D.
    0.5 to 1 kg/m.s

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  9. A centrifugal pump has the following specifications:
    Power = 4 H.P.; Speed = 800 rpm
    Head = 8 metres
    Flow = 1000 litres/minutes.
    If its speed is halved, the new discharge will be __________ litres/minute.

  10. A.
    500
    B.
    200
    C.
    1000
    D.
    750

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  11. The dimension of kinematic viscosity is

  12. A.
    ML-2T-1
    B.
    L2T-1
    C.
    ML-2T-2
    D.
    none of these

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  13. A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is

  14. A.
    20 m/sec
    B.
    10 m/sec
    C.
    52 m/sec
    D.
    5 m/sec

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  15. Turbulent flow generally occurs for cases involving

  16. A.
    highly viscous fluid
    B.
    very narrow passages
    C.
    very slow motion
    D.
    none of these

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  17. Lower BWG means __________ of the tube.

  18. A.
    lower thickness
    B.
    lower cross-section
    C.
    outer diameter
    D.
    inner diameter

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  19. For laminar flow of Newtonion fluid in a circular pipe, the velocity distribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship.

  20. A.
    logarithmic
    B.
    parabolic
    C.
    hyperbolic
    D.
    linear

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