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Chemical Engineering :: Fluid Mechanics

  1. Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics?

  2. A.

     Archimedes principle

    B.

     Newton

    C.

     Hooke

    D.

     Newton


  3. What causes cavitation in centrifugal pump?

  4. A.

     High suction pressure

    B.

     Low barometric pressure

    C.

     Low suction pressure

    D.

     High suction velocity


  5. For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively).

  6. A.

     G is above B

    B.

     B is above G

    C.

     B & G coincide

    D.

     None of these


  7. The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

  8. A.

     P, Q and R

    B.

     P and R

    C.

     R and S

    D.

     P, Rand S


  9. Momentum transfer in laminar flow of fluids results due to the

  10. A.

     Viscosity

    B.

     Density

    C.

     Velocity gradient

    D.

     None of these


  11. The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the

  12. A.

     Inverse of fluid viscosity

    B.

     Square of particle size

    C.

     Difference in the densities of the particle & fluid

    D.

     All of the above


  13. Cd is always __________ Cc.

  14. A.

     Greater than

    B.

     Less than

    C.

     Equal to

    D.

     Either more or less than


  15. Velocity distribution for flow between two fixed parallel plates

  16. A.

     Varies parabolically across the section

    B.

     Is constant over the entire cross-section

    C.

     Is zero at the plates and increases linearly to the midplane

    D.

     None of these


  17. A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is __________ hp.

  18. A.

     1

    B.

     10/55

    C.

     5.5

    D.

     1/55


  19. In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

  20. A.

     Relative roughness

    B.

     Absolute roughness

    C.

     Friction co-efficient for flows at equal Reynold number

    D.

     All of the above