Test: Flow in Open Channel - 2
9 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering | Test: Flow in Open Channel - 2
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Hydraulic jump is a case of rapidly varied flow. It occurs when a super-critical flow stream tries to reach its alternate depth in subcritica! mode. In the process it losses substantial energy and falls short of the alternate depth.
What is the velocity of flow of water through a rectangular channel of 6 m wide and 3 m deep, When it is running full. The channel is having bed slope as 1 in 2000.
[Take Chezy’s constant C = 55]
[Take Chezy’s constant C = 55]
b = 6 m, d = 3 m
A = b x d = 18 m2,
P = b + 2d - 6 + 6 = 12
[Tips: This type of question can be solved by guessing about square root i.e. 2.42 = 5.76,2.62 = 6.76, 2.82 = 7.84].
How is the best hydraulic channel cross-section defined?
A rectangular channel with be most economical when the flow depth to bottom width are in the ratio
For minimum wetted perimeter,
d = b/2
∴ d/b = 1.2
In open channel flow, a triangular section will be most economical when the vertex angle at the triangle base point is
The discharge through a trapezoidal channel is maximum when the top width equals
The best slope for the most economical trapezoidal section of an open channel is ..... to the horizontal.
for best side slope
or 
or 
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