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Chemical Engineering :: Fluid Mechanics

  1. Which of the following produces maximum pressure difference for transportation of gases?

  2. A.

     Vaccum pumps

    B.

     Blowers

    C.

     Fans

    D.

     Compressors


  3. A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.

  4. A.

     10 m

    B.

     11 m

    C.

     12 m

    D.

     20 m


  5. The nominal size of a hose pipe is specified by its

  6. A.

     I.D.

    B.

     O.D.

    C.

     Thickness

    D.

     None of these


  7. Rise of liquid in a capillary tube is due to

  8. A.

     Cohesion

    B.

     Adhesion

    C.

     Both A & B

    D.

     Neither A nor B


  9. The normal stress is the same in all directions at a point in a fluid, when the fluid is

  10. A.

     Non-viscous

    B.

     Incompressible

    C.

     Both A and B

    D.

     Having no motion of one fluid layer relative to the other


  11. Interstage coolers are provided in a multistage compressor to

  12. A.

     Save power in compressing a given volume to a given pressure

    B.

     Cool the delivered air

    C.

     Achieve the exact delivery pressure

    D.

     None of these


  13. Purpose of relief valve in a reciprocating pump is to

  14. A.

     Protect the pump against developing excessive pressure

    B.

     Facilitate unidirectional flow of liquid

    C.

     Reduce the discharge pressure

    D.

     Control the rate of discharge


  15. Function of air vessel provided in a reciprocating pump is to

  16. A.

     Reduce discharge fluctuation

    B.

     Reduce the danger of cavitation

    C.

     Avoid the necessity of priming

    D.

     Increase the pump efficiency


  17. The speed of sound in an ideal gas varies as the

  18. A.

     Temperature

    B.

     Pressure

    C.

     Density

    D.

     None of these


  19. The energy loss in flow through ven-turimeter is less than that through flow nozzle, because in case of a flow nozzle, the

  20. A.

     Length is shorter

    B.

     Throat diameter is more

    C.

     Sudden expansion of flow in the downstream occurs

    D.

     Distance between the throat and the inlet is more