Hydraulics problems
- 1. For the most economical trapezoidal section of a channel with regards to discharge, the required condition, is
Options- A. half of top width = sloping side
- B. hydraulic depth = half the depth
- C.
- D. perpendiculars drawn from the centre of the top width on to the bottom sloping side, are all equal
- E. all the above. Discuss
Correct Answer: all the above.
- 2. Pick up the correct statement from the following :
Options- A. Total energy gradient is the graphical representation of the total head at any section of a pipe line
- B. Vertical distance between the total energy line and hydraulic grade line is equal to the velocity head
- C. Vertical distance between the total energy line and total energy gradient represents loss of head
- D. all the above. Discuss
Correct Answer: all the above.
- 3. Manning's formula is used for
Options- A. flow in open channels
- B. head loss due to friction in open channels
- C. head loss due to friction in pipes flowing full
- D. flow in pipes. Discuss
Correct Answer: head loss due to friction in open channels
- 4. On an inclined plane, centre of pressure is located
Options- A. at the centroid
- B. above the centroid
- C. below the centroid
- D. anywhere. Discuss
Correct Answer: below the centroid
- 5. For the flow of liquid from an open ended tube (or nozzle) leading to the formation of spray of liquid drops, the number generally applied, is
Options- A. Froude number
- B. Weber number
- C. Reynold number
- D. Mach number. Discuss
Correct Answer: Weber number
- 6. If Cv, Cc, Cd and Cr are the hydraulic coefficients of an orifice, then
Options- A. Cd = Cc . Cv
- B. Cr = 1 + Cv2/Cd
- C. Cv = Cc + Cd
- D. Cc = Cv/Cd Discuss
Correct Answer: Cd = Cc . Cv
- 7. The specific weight of water is 1000 kg/m3
Options- A. at normal pressure of 760 mm
- B. at 4°C temperature
- C. at mean sea level
- D. all the above. Discuss
Correct Answer: all the above.
- 8. Piezometers are used to measure
Options- A. pressure in water channels, pipes etc.
- B. difference in pressure at two points
- C. atmospheric pressure
- D. very low pressure. Discuss
Correct Answer: very low pressure.
- 9. The rise of the liquid along the walls of a revolving cylinder above the initial level, is
Options- A. greater than the depression of the liquid at the axis of rotation
- B. lesser than the depression of the liquid at the axis of rotation
- C. the same as the depression of the liquid at the axis of rotation
- D. none of these. Discuss
Correct Answer: the same as the depression of the liquid at the axis of rotation
- 10. When no air is left below the nappe and water stream adheres to the down stream face of the weir, it is known as
Options- A. free nappe
- B. depressed nappe
- C. clinging nappe
- D. none of these. Discuss
Correct Answer: clinging nappe
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