Engineering :: Fluid Mechanics and Hydraulic Machines
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| 131. |
The most efficient cross-section for a channel is |
| A. |
Semi-circular |
B. |
Square |
| C. |
Rectangular |
D. |
Triangular |
| E. |
Half hexagon in the form of a trapezoid |
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Answer: Option E
Explanation:
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| 132. |
The most economical section of a triangular channel is |
| A. |
A right angled triangle |
B. |
An equilateral triangle |
| C. |
An isosceles triangle with vertex angle of 45? |
D. |
An isosceles triangles with vertex angle of 60? |
| E. |
An isosceles triangle with vertex angle of 90? |
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Answer: Option E
Explanation:
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| 133. |
The upper surface of the weir over which water flows is known as |
Answer: Option C
Explanation:
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| 134. |
Manning's formula is used to determine |
| A. |
Friction hed loss in pipes running full |
B. |
Friction head loss in pipes running partially full |
| C. |
Friction head loss in open channels |
D. |
Friction head loss in irregular sections |
| E. |
Discharge through weirs and notches |
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Answer: Option C
Explanation:
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| 135. |
A critical depthmeter is used to measure |
| A. |
Effective head of fluid flowing in a pipe |
B. |
Depth of oceans and rivers |
| C. |
Rise in head during water hammer |
D. |
Rise in head during hydraulic jump |
| E. |
Discharge in an open channel |
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Answer: Option E
Explanation:
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| 136. |
The width of a weir with end contractions is |
| A. |
Equal to the width of the channel |
B. |
Less than the width of the channel |
| C. |
Half the width of the channel |
D. |
One fourth the width of the channel |
| E. |
None of the above |
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Answer: Option B
Explanation:
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| 137. |
The horizontal to vertical side slope in case of Cpppoletti weir is |
Answer: Option E
Explanation:
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| 138. |
The losses in an open channel vary |
| A. |
As the velocity |
B. |
As the square of velocity |
| C. |
As the cube of velocity |
D. |
Inversely with a gradient |
| E. |
Inversely as the hydraulic radius |
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Answer: Option B
Explanation:
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| 139. |
A critical depthmeter is always |
| A. |
Associated with surge |
B. |
Associated with water hammer |
| C. |
Associated with hydraulic jump |
D. |
Associated with steep gradient |
| E. |
Associated with tranquil flow |
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Answer: Option C
Explanation:
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| 140. |
A stepped notch is |
| A. |
A notch of varying shapes along the line of flow |
B. |
Semi-elliptical in section |
| C. |
A combination of triangular and a circular section |
D. |
A combination of rectangular notches of different sizes |
| E. |
A combination of triangular notches of different sizes |
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Answer: Option D
Explanation:
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