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Chemical Engineering :: Fluid Mechanics

  1. The curve of metacentre for a floating body __________ the curve of buoyancy.

  2. A.

     Is always below

    B.

     Is the evolute of

    C.

     Intersects at right angle

    D.

     Is tangential to

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  3. At a constant speed of the centrifugal pump . it __________ the impeller diameter.

  4. A.

     Capacity varies directly with

    B.

     Head varies as the square of

    C.

     Horsepower varies as the cube of

    D.

     All of the above

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  5. Navier-Stokes equation is useful in the analysis of __________ fluid flow problems.

  6. A.

     Non-viscous

    B.

     Viscous

    C.

     Turbulent

    D.

     Rotational

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  7. In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.

  8. A.

     Directly proportional to

    B.

     Inversely proportional to

    C.

     Inversely proportional to the square root of

    D.

     Independent of

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  9. For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.

  10. A.

     Brings about no further reduction of

    B.

     Increases

    C.

     Decreases

    D.

     None of these

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  11. Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate.

  12. A.

     Elastic

    B.

     Viscous

    C.

     Gravity

    D.

     None of these

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  13. In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas)

  14. A.

     1/√M

    B.

     √M

    C.

     1/M

    D.

     M

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  15. Fanning friction factor is equal to(where, fB = Blassius friction factor).

  16. A.

     fB/4

    B.

     fB/2

    C.

     4fB

    D.

     2fB

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  17. For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe , plot is

  18. A.

     1

    B.

     -1

    C.

     0.5

    D.

     -0.5

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  19. Various efficiencies of a centrifugal pump are related as (where, ηm = mechanical efficiency ηv = volumetric efficiency. ηma = manometric efficiency ηo = overall efficiency)

  20. A.

     ηma x ηm x ηv = ηo

    B.

     ηm = ηv . ηma

    C.

     ηma = ηm x ηv

    D.

     ηv = ηm x ηma

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