Fluid Mechanics problems
- 1. The dimension of dynamic viscosity is
Options- A. ML-1T-1
- B. L2T-1
- C. LT-2
- D. ML-1T-2 Discuss
Correct Answer: ML-1T-1
- 2. Which of the following denotes the effect of compressibility in fluid flow?
Options- A. Weber number
- B. Mach number
- C. Euler number
- D. Reynolds number Discuss
Correct Answer: Mach number
- 3. Schedule number of a pipe, which is a measure of its wall thickness, is given by
Options- A. 1000 P'/S
- B. 100 P'/S
- C. 1000 S/P'
- D. 10000 P'/S Discuss
Correct Answer: 1000 P'/S
- 4. 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
Correct Answer: None of these
- 5. 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
Correct Answer: FL-1
- 6. 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
Correct Answer: flow pressure approaches its vapor pressure at the prevailing temperature.
- 7. 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
Correct Answer: both (a) and (b)
- 8. All pipes of a particular nominal size have the same
Options- A. inside diameter
- B. outside diameter
- C. thickness
- D. none of these Discuss
Correct Answer: outside diameter
- 9. 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. Discuss
Correct Answer: inertial forces control and viscous forces are unimportant.
- 10. 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
Correct Answer: rapid pressure change due to a rapid change in the rate of flow.
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