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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

  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.

  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

  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

  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

  11. The dimension of kinematic viscosity is

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

  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

  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

  17. Lower BWG means __________ of the tube.

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

  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