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Chemical Engineering :: Fluid Mechanics

  1. Quicksand is an example of a __________ fluid.

  2. A.

     Bingham plastic

    B.

     Dilatent

    C.

     Newtonion

    D.

     Pseudoplastic

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  3. Drag is the force component exerted on an immersed object,

  4. A.

     Passing the centroid of the body at 60°to the direction of motion

    B.

     The component being parallel to theflow direction

    C.

     The component being normal to the flow direction

    D.

     None of these

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  5. In case of a pipe exit fitted with a nozzle, the

  6. A.

     Conversion of kinetic head to pressure head is facilitated

    B.

     Conversion of pressure head to kinetic head is facilitated

    C.

     Power transmitted through the nozzle is maximum, when the head lost due to friction in the pipe is equal to one third of the total supply head

    D.

     Both B and C

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  7. Reynolds number is the ratio of

  8. A.

     Viscous forces to gravity forces

    B.

     Inertial forces to viscous forces

    C.

     Viscous forces to inertial forces

    D.

     Inertial forces to gravity forces

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  9. The valve used for very remote and accurate control of fluid is a __________ valve.

  10. A.

     Needle

    B.

     Globe

    C.

     Gate

    D.

     Butterfly

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  11. The terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n' for Newton's law regime?

  12. A.

     0.5

    B.

     1

    C.

     1.5

    D.

     3

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  13. Absolute viscosity of a fluid is a function of the __________ of the fluid.

  14. A.

     Motion

    B.

     Pressure & temperature

    C.

     Shearing stress

    D.

     Both B & C

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  15. A free jet of water of cross-sectional area 0.01m² and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is

  16. A.

     200 N

    B.

     400 N

    C.

     2000 N

    D.

     4000 N

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  17. Which of the following relationship is valid for the equilibrium position of the float in a rotameter ?(where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float)

  18. A.

     Df + Bf = Wf

    B.

     Df = Bf + Wf

    C.

     Df + Bf + Wf =0

    D.

     None of these

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  19. With increasing flow rate, the hydraulic efficiency of a centrifugal pump

  20. A.

     Monotonically decreases

    B.

     Decreases and then increases

    C.

     Remains constant

    D.

     Increases and then decreases

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