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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


  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


  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


  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


  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


  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


  13. Which of the following is a Newtonian fluid?

  14. A.

     Rubber latex

    B.

     Sewage sludge

    C.

     Quicksand

    D.

     Non-colloidal solution


  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


  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


  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