Hydraulics and Fluid Mechanics problems
- 1. The flow in a pipe is turbulent when Reynold number is
Options- A. less than 2000
- B. between 2000 and 2800
- C. more than 2800
- D. none of these Discuss
Correct Answer: more than 2800
- 2. The specific weight of sea water is __________ that of pure water.
Options- A. same as
- B. less than
- C. more than Discuss
Correct Answer: more than
- 3. According to Pascal's law, the intensity of pressure at any point in a fluid at rest is the same in all directions.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 4. The intensity of pressure on an immersed surface __________ with the increase in depth.
Options- A. does not change
- B. increases
- C. decreases Discuss
Correct Answer: increases
- 5. In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.
Options- A. less than
- B. more than Discuss
Correct Answer: less than
- 6. The flow in a pipe is neither laminar nor turbulent when Reynold number is
Options- A. less than 2000
- B. between 2000 and 2800
- C. more than 2800
- D. none of these Discuss
Correct Answer: between 2000 and 2800
- 7. With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will
Options- A. decrease
- B. increase
- C. remain unchanged
- D. depend upon the characteristics of liquid Discuss
Correct Answer: decrease
- 8. The total energy line lies over the centre line of the pipe by an amount equal to
Options- A. pressure head
- B. velocity head
- C. pressure head + velocity head
- D. pressure head - velocity head Discuss
Correct Answer: pressure head + velocity head
- 9. The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)
Options- A. w.A
- B. wx
- C. wAx
- D. wA/x Discuss
Correct Answer: wAx
- 10. The flow in a pipe is laminar, when Reynold number is less than 2000.
Options- A. True
- B. False Discuss
Correct Answer: True
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