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Chemical Engineering :: Fluid Mechanics

  1. The fluid jet discharging from a 2" diameter orifice has a diameter of 1.75" at its vena-contracta. The co-efficient of contraction is

  2. A.

     1.3

    B.

     0.766

    C.

     0.87

    D.

     None of these


  3. What is the normal range of exit cone angle of a venturimeter?

  4. A.

     2 to 5

    B.

     7 to 15

    C.

     15 to 25

    D.

     >25


  5. Upto what value of 'Mach number', a fluid may be considered as incompressible?

  6. A.

     0.03

    B.

     0.3

    C.

     3

    D.

     10


  7. The head loss due to sudden contraction is proportional to

  8. A.

     Velocity

    B.

     Velocity head

    C.

     Turbulence

    D.

     None of these


  9. With increase in the shear rate, the apparent viscosity of pseudoplastic fluids

  10. A.

     Increases

    B.

     Decreases

    C.

     Remains same

    D.

     May increase or decrease; depends on the magnitude of shear rate


  11. Boundary layer separation is characterised by one of the conditions given below, where 'Re' is the Reynolds number for the flow. Select the appropriate conditions.

  12. A.

     Re << 1, accelerating flow

    B.

     Re >> 1, accelerating flow

    C.

     Re << 1, decelerating flow

    D.

     Re >>1, decelerating flow


  13. For the same terminal conditions and fitting size, the least friction loss is incurred in a/an

  14. A.

     T-joint

    B.

     Union

    C.

     45° elbow

    D.

     90°bend


  15. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

  16. A.

     0.5

    B.

     1

    C.

     1.5

    D.

     2


  17. The fluid property, due to which, mercury does not wet the glass is

  18. A.

     Surface tension

    B.

     Viscosity

    C.

     Cohesion

    D.

     Adhesion


  19. The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the

  20. A.

     Discharge

    B.

     Suction

    C.

     Suction minus vapor pressure of the liquid at suction temperature

    D.

     Discharge minus vapor pressure of the liquid at the discharge temperature