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Chemical Engineering :: Fluid Mechanics

  1. Boundary layer separation is caused by the

  2. A.

     Reduction of pressure below vapour pressure

    B.

     Reduction of pressure gradient to zero

    C.

     Adverse pressure gradient

    D.

     Reduction of boundary layer thickness to zero


  3. In case of centrifugal fan or blower, the gas capacity varies as

  4. A.

     Speed

    B.

     (speed)2

    C.

     (speed)3

    D.

     (speed)0.5


  5. With increase in the temperature, viscosity of a liquid

  6. A.

     Increases

    B.

     Decreases

    C.

     Remains constant

    D.

     May increase or decrease; depends on the liquid


  7. A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid.

  8. A.

     Newtonion

    B.

     Viscous

    C.

     Dilatant

    D.

     Non-viscous


  9. Which is the most efficient and best for measuring very small flow rate of gases?

  10. A.

     Venturimeter

    B.

     Orifice meter

    C.

     Rotameter

    D.

     Flow nozzle


  11. The pressure and power requirement of a gas fan at constant speed & capacity varies __________ the gas density.

  12. A.

     Directly as

    B.

     Inversely as square root of

    C.

     Inversely as

    D.

     As square of


  13. For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the

  14. A.

     Square of the radial distance

    B.

     Radial distance linearly

    C.

     Inverse of the radial distance

    D.

     Elevation along vertical direction


  15. To handle smaller quantity of fluid at higher discharge pressure, use a __________ pump.

  16. A.

     Reciprocating

    B.

     Centrifugal

    C.

     Volute

    D.

     Rotary vacuum


  17. What is the ratio of fluid carrying capacity of two pipes having diameters d₁ and d₂ respectively?

  18. A.

     (d₁/d₂)0.8

    B.

     (d₁/d₂)0.5

    C.

     (d₁/d₂)

    D.

     (d₁/d₂)2


  19. What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir?

  20. A.

     Penstock

    B.

     Siphon

    C.

     Tunnel

    D.

     Pressure pipeline