Related Questions

The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to
A Half the depth
B Half the breadth
C Twice the depth
D Twice the breadth
A swimming pool is initially filled to a depth of 96 inches. After 2 weeks, the depth has decreased to9212 inches. Assuming that the depth decreased at a constant rate, after how many days would the water depth have reached 9334 inches?
A 3
B 9
C 7
D 6
V and R are the regime mean velocity and hydraulic mean depth respectively in meters. Lacey's silt factor f is
A $$\frac{{2{{\text{V}}^2}}}{{\sqrt 3 {\text{R}}}}$$
B $$\frac{{3{{\text{V}}^2}}}{{4{\text{R}}}}$$
C $$\frac{{5{{\text{V}}^2}}}{{2{\text{R}}}}$$
D $$\frac{{2{{\text{V}}^2}}}{{5{\text{R}}}}$$
In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is
A 0.5
B 0.84
C 1.84
D 1.25
The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is
A 0.5
B 1
C 1.5
D 2
If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be
A four times the first one
B same as the first one
C one fourth of the first one
D one and a half times the first one
The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is
A 0.3
B 0.9
C 0.03
D 0.66
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to
A $$\frac{1}{2}$$ × depth
B $$\frac{1}{2}$$ × breadth
C $$\frac{1}{2}$$ × sloping side
D $$\frac{1}{4}$$ × (depth + breadth)
The hydraulic mean depth for a circular pipe of diameter (d) is
A $$\frac{{\text{d}}}{6}$$
B $$\frac{{\text{d}}}{4}$$
C $$\frac{{\text{d}}}{2}$$
D $${\text{d}}$$
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is
A Equal to HMD when flowing full
B Less than HMD when flowing full
C Greater than HMD when flowing full
D None of the above

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