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Chemical Engineering :: Fluid Mechanics

  1. Maintenance cost of a __________ pump for a particular duty is the least.

  2. A.

     Centrifugal

    B.

     Reciprocating

    C.

     Volute

    D.

     Gear


  3. For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively).

  4. A.

     Increase

    B.

     Decrease

    C.

     Remain constant

    D.

     Either A or B; depends on other factors


  5. Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter 'd'

  6. A.

     D

    B.

     0.5d

    C.

     2d

    D.

     4d


  7. I.D. of 1/4" schedule 40 pipe is 0.364". I.D. of a 1/2" schedule 40 pipe would be __________ inch

  8. A.

     4.728

    B.

     0.5

    C.

     0.622

    D.

     0.474


  9. The valve commonly used in pipes larger than 2" dia is a

  10. A.

     Globe valve

    B.

     Plug-cock

    C.

     Gate valve

    D.

     Check valve


  11. If in a flow field, between any two points, then the flow must be

  12. A.

     Steady, incompressible, irrotational

    B.

     Steady, compressible, irrotational

    C.

     Steady, compressible and along a streamline

    D.

     Unsteady, incompressible, irrotational


  13. Which of the following factors does not contribute to the pressure drop in a pipeline ?

  14. A.

     Velocity of fluid

    B.

     Size of pipe

    C.

     Length of pipe and number of bends

    D.

     None of these


  15. A piezometer provided in the pipe measures

  16. A.

     Friction factor

    B.

     Static pressure

    C.

     Dynamic pressure

    D.

     None of these


  17. Air vessel of a reciprocating pump is initially filled with

  18. A.

     Atmospheric air

    B.

     Compressed air

    C.

     Water

    D.

     None of these


  19. The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is

  20. A.

     4(Ro-Ri)

    B.

     √(Ro-Ri)

    C.

     2(Ro-Ri)

    D.

     Ro + Ri