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Chemical Engineering :: Fluid Mechanics

  1. Which of the following equations is valid for laminar flow of a fluid through packed bed?

  2. A.

     Fanning equation

    B.

     Kozney - Karman equation

    C.

     Hagen - Poiseuille equation

    D.

     Blake - Plummer equation

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  3. Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about

  4. A.

     0.42

    B.

     0.62

    C.

     0.82

    D.

     0.98

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  5. Fanning friction factor for laminar flow of fluid in a circular pipe is

  6. A.

     Not a function of the roughness of pipe wall

    B.

     Inversely proportional to Reynolds number

    C.

     Both A and B

    D.

     Neither A nor B

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  7. The distribution of shear stress in a stream of fluid in a circular tube is

  8. A.

     Linear with radius for turbulent flow only

    B.

     Linear with radius for laminar flow only

    C.

     Linear with radius for both laminar & turbulent flow

    D.

     Parabolic with radius for both laminar & turbulent flow

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  9. Purpose of hydraulic accumulator is to

  10. A.

     Ensure intermittant supply of hydraulic pressure

    B.

     Increase the pressure and store/ accumulate it

    C.

     Accumulate pressure to increase force

    D.

     Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc

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  11. Which of the following properties of a fluid is responsible for offering resistance to shear?

  12. A.

     Surface tension

    B.

     Viscosity

    C.

     Specific gravity

    D.

     All of the above

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  13. Which of the following is a Newtonian fluid?

  14. A.

     Rubber latex

    B.

     Sewage sludge

    C.

     Quicksand

    D.

     Non-colloidal solution

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  15. An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yield stress. Which of the following is an ideal plastic?

  16. A.

     Sewage sludge

    B.

     Rubber latex

    C.

     Blood

    D.

     Sugar solution

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  17. Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.

  18. A.

     Smaller than

    B.

     Larger than

    C.

     Same as

    D.

     Twice

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  19. Centrifugal pumps as compared to reciprocating pumps

  20. A.

     Run at a lower speed for the same discharge

    B.

     Do not need priming

    C.

     Deliver fluid with pulsating/fluctuating discharge

    D.

     Can be run with discharge line valve closed for a short interval

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