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Chemical Engineering :: Fluid Mechanics

  1. Foot valves are provided in the suction line of a centrifugal pump to

  2. A.

     Avoid priming, every time we start the pump

    B.

     Remove the contaminant present in the liquid

    C.

     Minimise the fluctuation in discharge

    D.

     Control the liquid discharge

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  3. Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.

  4. A.

     Piston

    B.

     Gear

    C.

     Positive displacement

    D.

     Sump

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  5. Lower BWG means __________ of the tube.

  6. A.

     Lower thickness

    B.

     Lower cross-section

    C.

     Outer diameter

    D.

     Inner diameter

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  7. In magnetic flow meters, voltage generation is

  8. A.

     Due to the motion of conducting fluid through an externally generated uniform field

    B.

     Proportional to the fluid velocity

    C.

     Both A and B

    D.

     Neither A nor B

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  9. Net positive suction head (NPSH) of a centrifugal pump must be

  10. A.

     Greater than the vapour pressure of the liquid

    B.

     Less than the vapour pressure of the liquid

    C.

     Equal to the vapour pressure of the liquid

    D.

     Less than barometric pressure

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  11. In a fully turbulent flow (Re > 105) in a pipe of diameter 'd', for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is

  12. A.

     d

    B.

     d2

    C.

     d2.5

    D.

     d4

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  13. A pressure head of 320 metres of water in meters of CCl₄ (sp.gr = 1.6) will be

  14. A.

     100

    B.

     200

    C.

     320

    D.

     160

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  15. A fluidis (μ/ρ = 0.01 cm²/sec) moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is __________ cm/sec.

  16. A.

     7

    B.

     700

    C.

     7000

    D.

     630

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  17. Drag co-efficient for flow past immersed body is the ratio of __________ to the product of velocity head and density.

  18. A.

     Shear stress

    B.

     Shear force

    C.

     Average drag per unit projected area

    D.

     None of these

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  19. The co-efficient of discharge of an orificemeter is a function of

  20. A.

     Reynolds number at the orifice

    B.

     Ratio of orifice dia to pipe dia

    C.

     Both A and B

    D.

     None of the above parameters, and has a constant value of 0.61

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