Discussion
Home ‣ Chemical Engineering ‣ Fluid Mechanics Comments
- Question
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.
- Correct Answer
- monotonically decreases.
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. All pipes of a particular nominal size have the same
Options- A. inside diameter
- B. outside diameter
- C. thickness
- D. none of these Discuss
- 6. The fluid property, due to which, mercury does not wet the glass is
Options- A. surface tension
- B. viscosity
- C. cohesion
- D. adhesion Discuss
- 7. 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
Options- A. relative roughness.
- B. absolute roughness.
- C. friction co-efficient for flows at equal Reynold number.
- D. all (a), (b) & (c). Discuss
- 8. Pick out the wrong statement.
Options- A. Momentum transfer in laminar flow results from veclocity gradient.
- B. A fluid in equilibrium is not free from shear stress.
- C. The viscosity of a non-Newtonion fluid is a function of temperature only.
- D. both (b) and (c) Discuss
- 9. For a particle settling in water at its terminal settling velocity, which of the following is true?
Options- A. Buoyancy = weight + drag
- B. Weight = buoyancy + drag
- C. Drag = buoyancy + weight
- D. Drag = weight Discuss
- 10. The head loss in turbulent flow in a pipe varies
Options- A. as velocity
- B. as (velocity)2
- C. inversely as the square of diameter
- D. inversely as the velocity Discuss
Fluid Mechanics problems
Search Results
Correct Answer: all (a), (b) and (c)
Correct Answer: 2 to 3
Correct Answer: rapid pressure change due to a rapid change in the rate of flow.
Correct Answer: inertial forces control and viscous forces are unimportant.
Correct Answer: outside diameter
Correct Answer: surface tension
Correct Answer: friction co-efficient for flows at equal Reynold number.
Correct Answer: both (b) and (c)
Correct Answer: Weight = buoyancy + drag
Correct Answer: as (velocity)2
Comments
There are no comments.More in Chemical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.