Civil Engineering - Hydraulics - Discussion
Discussion Forum : Hydraulics - Section 4 (Q.No. 43)
43.
The ratio of the hydraulic radius of a pipe running full to the hydraulic radius of a square section of a channel whose side is equal to the diameter of the pipe, is
1
Discussion:
22 comments Page 1 of 3.
Hemanth said:
3 years ago
Answer is 1.
In question, they are asking about hydraulic radius, not hydraulic mean depth Hydraulic radius RC.
The hydraulic diameter of circles D=4A/P RADIUS=D/2
A= √D2/4 P=√D.
For square section side D.
A=D^2 P=4D.
RATIO CIRCLES/SQUARE.
THE ANSWER IS 1.
OPTION A IS CORRECT.
In question, they are asking about hydraulic radius, not hydraulic mean depth Hydraulic radius RC.
The hydraulic diameter of circles D=4A/P RADIUS=D/2
A= √D2/4 P=√D.
For square section side D.
A=D^2 P=4D.
RATIO CIRCLES/SQUARE.
THE ANSWER IS 1.
OPTION A IS CORRECT.
(2)
Inayat Ullah Kakar said:
11 months ago
It is very simple;
R = D/4 for circular section
And for;
In square section we know that;
R = area/ wetted perimeter
R = BD/B + 2D.
In questions that B= D because of the square section
R = D^2/3D
R =D/3
So, ratio R1/R2.
D/4รท D/3.
We get 3/4.
So the given answer is correct.
R = D/4 for circular section
And for;
In square section we know that;
R = area/ wetted perimeter
R = BD/B + 2D.
In questions that B= D because of the square section
R = D^2/3D
R =D/3
So, ratio R1/R2.
D/4รท D/3.
We get 3/4.
So the given answer is correct.
(3)
Hasmukh parmar said:
6 years ago
The hydraulic radius of circle = d/4.
The hydraulic radius of square = d/3 ( because here we are considering wetted perimeter so two sides and bottom are wetted but top width is not wetted because it's open in the atmosphere)
So, correct answer is = d.3/d.4 = 3/4.
The hydraulic radius of square = d/3 ( because here we are considering wetted perimeter so two sides and bottom are wetted but top width is not wetted because it's open in the atmosphere)
So, correct answer is = d.3/d.4 = 3/4.
(2)
Archana Shaji said:
7 years ago
Question asked is square channel section.
So the wetted perimeter for square channel section is 3d. Hence hydraulic radius = d^2/3d = d/3.
Hydraulic radius of the circular pipe is d/4. So the correct answer is 3/4.
So the wetted perimeter for square channel section is 3d. Hence hydraulic radius = d^2/3d = d/3.
Hydraulic radius of the circular pipe is d/4. So the correct answer is 3/4.
(1)
Jay said:
7 years ago
@All.
But remember the question says that the square section is running full to the wetted perimeter should be 4D and not 3D and by this, the answer should be A.
But remember the question says that the square section is running full to the wetted perimeter should be 4D and not 3D and by this, the answer should be A.
Nayan said:
8 years ago
For circular pipe hydraulic mean depth = d/4.
For the square section of channel hydraulic mean depth=d/3.
Ratio of the circle to square= 3/4.
For the square section of channel hydraulic mean depth=d/3.
Ratio of the circle to square= 3/4.
Timi said:
2 years ago
@All.
Option A, 1 would be correct if it was a square pipe. Here it is a channel. So three sides would be included in wetted parameters.
Option A, 1 would be correct if it was a square pipe. Here it is a channel. So three sides would be included in wetted parameters.
(1)
Minesh Rathore said:
8 years ago
Yes, the answer should be A.
Because hydraulic radius for pipe and square section is the same D/4. So, the ratio is 1.
Because hydraulic radius for pipe and square section is the same D/4. So, the ratio is 1.
Saleem Ansari said:
8 years ago
Both hydraulic radius is not same.
Circular hydraulic radius = D/4 and
Square Hydraulic radius = 3/D.
So Ans is D.
Circular hydraulic radius = D/4 and
Square Hydraulic radius = 3/D.
So Ans is D.
Saurabh said:
3 years ago
D is the correct answer.
Hydraulic radius of circular section = D/4.
And for square = D/3,
So, the ratio is = 3/4.
Hydraulic radius of circular section = D/4.
And for square = D/3,
So, the ratio is = 3/4.
(4)
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