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- Question
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.
- Correct Answer
- inverse of the fluid viscosity.
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 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
- 6. Which of the following is not concerned with the fluid-particle interaction?
Options- A. Drag co-efficient
- B. Froude number
- C. Galileo number
- D. Weber number Discuss
- 7. For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)
Options- A. Vs/Dp2
- B. Vs2/Dp2
- C. Vs2/Dp3
- D. Vs/Dp3 Discuss
- 8. Shear stress in a fluid flowing in a round pipe
Options- A. varies parabolically across the cross-section.
- B. remains constant over the cross-section.
- C. is zero at the centre and varies linearly with the radius.
- D. is zero at the wall and increases linearly to the centre. Discuss
- 9. Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds
Options- A. 4000
- B. 2100
- C. 1500
- D. 3000 Discuss
- 10. The terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n' for Newton's law regime?
Options- A. 0.5
- B. 1
- C. 1.5
- D. 3 Discuss
Fluid Mechanics problems
Search Results
Correct Answer: more than
Correct Answer: as (velocity)2
Correct Answer: Weight = buoyancy + drag
Correct Answer: both (b) and (c)
Correct Answer: friction co-efficient for flows at equal Reynold number.
Correct Answer: Weber number
Correct Answer: Vs/Dp2
Correct Answer: is zero at the centre and varies linearly with the radius.
Correct Answer: 2100
Correct Answer: 0.5
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