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- Question
At high Reynolds number
Options- A. inertial forces control and viscous forces are unimportant.
- B. viscous forces predominate.
- C. inertial forces are unimportant and viscous forces control.
- D. none of these.
- Correct Answer
- inertial forces control and viscous forces are unimportant.
- 1. All pipes of a particular nominal size have the same
Options- A. inside diameter
- B. outside diameter
- C. thickness
- D. none of these Discuss
- 2. Head developed by a centrifugal pump depends on its
Options- A. speed
- B. impeller diameter
- C. both (a) and (b)
- D. neither (a) nor (b) Discuss
- 3. In fluid flow, cavitation is caused, if the
Options- A. fluid velocity decreases to zero.
- B. total energy decreases.
- C. both (a) and (b).
- D. flow pressure approaches its vapor pressure at the prevailing temperature. Discuss
- 4. Dimension of surface tension is(where, F = force, L = length)
Options- A. FL-1
- B. F-1 . L
- C. F.L-2
- D. F-2 . L Discuss
- 5. Which of the following is not a dimension-less parameter?
Options- A. Euler number
- B. Specific gravity
- C. Fanning friction factor
- D. None of these Discuss
- 6. Water hammer in a pipeline results from the
Options- A. bursting of pipelines due to closure by a valve.
- B. rapid pressure change due to a rapid change in the rate of flow.
- C. pressure increase due to closure of a valve resulting in decrease in rate of flow.
- D. none of these. Discuss
- 7. Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid.
Options- A. 2 to 3
- B. 0.01 to 0.10
- C. 200 to 300
- D. 100 to 1000 Discuss
- 8. Pressure drag does not depend upon the
Options- A. roughness of surface of the body.
- B. pressure of main flow only.
- C. length of the body in flow direction.
- D. all (a), (b) and (c) Discuss
- 9. With increasing flow rate, the hydraulic efficiency of a centrifugal pump
Options- A. monotonically decreases.
- B. decreases and then increases.
- C. remains constant.
- D. increases and then decreases. Discuss
- 10. The fluid property, due to which, mercury does not wet the glass is
Options- A. surface tension
- B. viscosity
- C. cohesion
- D. adhesion Discuss
Fluid Mechanics problems
Search Results
Correct Answer: outside diameter
Correct Answer: both (a) and (b)
Correct Answer: flow pressure approaches its vapor pressure at the prevailing temperature.
Correct Answer: FL-1
Correct Answer: None of these
Correct Answer: rapid pressure change due to a rapid change in the rate of flow.
Correct Answer: 2 to 3
Correct Answer: all (a), (b) and (c)
Correct Answer: monotonically decreases.
Correct Answer: surface tension
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