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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

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  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

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  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

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  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

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  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

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  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

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  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

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  15. A piezometer provided in the pipe measures

  16. A.

     Friction factor

    B.

     Static pressure

    C.

     Dynamic pressure

    D.

     None of these

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

  18. A.

     Atmospheric air

    B.

     Compressed air

    C.

     Water

    D.

     None of these

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  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

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