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Chemical Engineering :: Fluid Mechanics

  1. The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by

  2. A.

     Cv . √(2gH)

    B.

     Cc . √(2gH)

    C.

     Cd . √(2gH)

    D.

     Cv . Va


  3. If 'x' is the depth of flow in an open channel of large width, then the hydraulic radius is equal to

  4. A.

     x

    B.

     x/2

    C.

     x/3

    D.

     2x/3


  5. In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes

  6. A.

     Less than atmospheric pressure

    B.

     More than liquid vapor pressure

    C.

     Less than liquid vapor pressure

    D.

     More than atmospheric pressure


  7. A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a __________ pump.

  8. A.

     Sump

    B.

     Volute

    C.

     Vacuum

    D.

     Submerged


  9. Check valve is used for __________ flow.

  10. A.

     Very precise control of

    B.

     Unidirectional

    C.

     Multidirectional

    D.

     None of these


  11. A rotameter works on the principle of __________ pressure drop.

  12. A.

     Constant

    B.

     Variable

    C.

     Both A & B

    D.

     Neither A nor B


  13. The continuity equation of fluid mechanics utilises the principle of conservation of

  14. A.

     Momentum

    B.

     Mass

    C.

     Energy

    D.

     Both B & C


  15. Which of the fluid forces are not considered in the Reynold's equation of flow?

  16. A.

     Viscous forces

    B.

     Turbulent forces

    C.

     Pressure forces

    D.

     Compressibility forces


  17. A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ₀ = 10 KPa, is shared between flat parallel plates separated by a distance of 10⁻³ m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is

  18. A.

     10 KPa

    B.

     20 KPa

    C.

     30 KPa

    D.

     40 KPa


  19. Piezometric head is the sum of the __________ heads.

  20. A.

     Elevation & kinetic energy

    B.

     Elevation & pressure

    C.

     Kinetic energy & pressure

    D.

     None of these