Fluid Mechanics problems
- 1. 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
Correct Answer: 2 to 3
- 2. 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
Correct Answer: all (a), (b) and (c)
- 3. 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
Correct Answer: monotonically decreases.
- 4. The fluid property, due to which, mercury does not wet the glass is
Options- A. surface tension
- B. viscosity
- C. cohesion
- D. adhesion Discuss
Correct Answer: surface tension
- 5. 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
Correct Answer: friction co-efficient for flows at equal Reynold number.
- 6. 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
Correct Answer: both (b) and (c)
- 7. 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
Correct Answer: Weight = buoyancy + drag
- 8. 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
Correct Answer: as (velocity)2
- 9. Power loss in an orificemeter is __________ that in a venturimeter.
Options- A. less than
- B. same as
- C. more than
- D. data insufficient, cannot be predicted Discuss
Correct Answer: more than
- 10. The terminal velocity of a small sphere settling in a viscous fluid varies as the
Options- A. first power of its dimeter.
- B. inverse of the fluid viscosity.
- C. inverse square of the diameter.
- D. square of the difference in specific weights of solid & fluid. Discuss
Correct Answer: inverse of the fluid viscosity.
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