Discussion
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- Question
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
- Correct Answer
- 0.5
- 1. Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds
Options- A. 4000
- B. 2100
- C. 1500
- D. 3000 Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.
Options- A. Bingham
- B. Newtonion
- C. perfect
- D. none of these Discuss
- 7. Dimension of absolute viscosity is
Options- A. ML-1T-1
- B. MLT-1
- C. ML-1T
- D. MLT Discuss
- 8. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is
Options- A. 0.5
- B. 1
- C. 1.5
- D. 2 Discuss
- 9. Pick out the correct statement.
Options- A. A forced vortex occurs when fluid rotates as a solid about an axis.
- B. In laminar flow, Newton's law of viscosity does not apply.
- C. A free vortex occurs, when fluidrotates as a solid.
- D. In turbulent flow, there are neither cross-currents nor eddies. Discuss
- 10. Foot valves provided in pumps are __________ valves.
Options- A. relief
- B. three/four way
- C. pressure reducing
- D. directional control Discuss
Fluid Mechanics problems
Search Results
Correct Answer: 2100
Correct Answer: is zero at the centre and varies linearly with the radius.
Correct Answer: Vs/Dp2
Correct Answer: Weber number
Correct Answer: inverse of the fluid viscosity.
Correct Answer: Newtonion
Correct Answer: ML-1T-1
Correct Answer: 2
Correct Answer: A forced vortex occurs when fluid rotates as a solid about an axis.
Correct Answer: directional control
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