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Chemical Engineering :: Fluid Mechanics

  1. In case of a rotameter, the density of the float material is __________ that of the liquid it replaces.

  2. A.

     More than

    B.

     Less than

    C.

     Equal to

    D.

     Either A or B


  3. In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.

  4. A.

     Inverse

    B.

     Square root

    C.

     Second power

    D.

     First power


  5. Which of the following has the maximum compression ratio?

  6. A.

     Blower

    B.

     Compressor

    C.

     Vacuum pump

    D.

     Fan


  7. Stoke's law is valid, when the particle Reynolds number is

  8. A.

     < 1

    B.

     > 1

    C.

     < 5

    D.

     None of these


  9. Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the

  10. A.

     Drag on particles

    B.

     Drag on coloumn walls

    C.

     Bed height

    D.

     Bed voidage


  11. Foot valve provided in the pump is a __________ valve.

  12. A.

     Direction control

    B.

     Back pressure

    C.

     Relief

    D.

     Pressure reduction


  13. A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is

  14. A.

     5

    B.

     14.1

    C.

     56.22

    D.

     28.2


  15. For flow through an orifice from a reservoir, the actual velocity at the vena con-tracta is given by

  16. A.

     √(2gh)

    B.

     C.V. √(2gh)

    C.

     Cd √(2gh)

    D.

     Cc √(2gh)


  17. In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is

  18. A.

     0.5

    B.

     0.84

    C.

     1.84

    D.

     1.25


  19. Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m)

  20. A.

     N²D³

    B.

     ND²

    C.

     N²D

    D.

     N³D⁵