Engineering Questions with Answers - Multiple Choice Questions
MCQs on Discharge Over different type of weirs
1 - Question
In discharge of water over narrow crested weir, head of water is directly proportional to Discharge Coefficient.
a) True
b) False
View Answer
b
Explanation: In discharge of water over narrow crested weir, head of water is inversely proportional to Discharge Coefficient.
2 - Question
In discharge of water over narrow crested weir, discharge is directly proportional to the cube root of acceleration due to gravity.
a) True
b) False
View Answer
b
Explanation: In discharge of water over narrow crested weir, discharge is directly proportional to the square root of acceleration due to gravity.
3 - Question
In discharge of water over ogee weir, discharge is directly proportional to the second power of length.
a) True
b) False
View Answer
b
Explanation: In discharge of water over ogee weir, discharge is directly proportional to the first power of length.
4 - Question
For discharge over ogee weir discharge is directly proportional to length but for discharge over narrow crested weir it is inversely proportional to length.
a) True
b) False
View Answer
b
Explanation: For both weirs it’s same.
5 - Question
An Ogee weir 5 m long had a head of 40 cm of water. If CD = 0.61, find the discharge over the weir.
a) 2.9 m3/s
b) 2.3 m3/s
c) 3.1 m3/s
d) 3.3 m3/s
View Answer
a
Explanation: Q = 0.67 * Cd * L * √2g * H1.5
Q = 2.3 m3/s.
6 - Question
The height of water on upstream and downstream side of a submerged weir of 4 m length are 24 cm and 13 cm. If Cd for free and drowned portions are .62 and .78 respectively, find the discharge over the weir.
a) .85 m3/s
b) 1.35 m3/s
c) 3.2 m3/s
d) .55 m3/s
View Answer
a
Explanation: Q = 0.67 * Cd1 * L * √2g * H1.5 +. Cd2 * L * h * √2g(H – h)
= .67 * .6 * 3 * √2g * (.24 – .13)1.5 + .8 * 3 * .13 √2g(.24 – .13)
= .85 m3/s.
7 - Question
An Ogee weir 3.4 m long had a head of 40 cm of water. If CD = 0.63 find the discharge over the weir.
a) 1.61 m3/s
b) 2.5 m3/s
c) 3.1 m3/s
d) 3.3 m3/s
View Answer
a
Explanation: Q = 0.67 * Cd * L * √2g * H1.5
Q = 1.61 m3/s.
8 - Question
The height of water on upstream and downstream side of a submerged weir of 4 m length are 23.5 cm and 14 cm. If Cd for free and drowned portions are .61 and .75 respectively, find the discharge over the weir.
a) m3/s
b) 1.35 m3/s
c) 3.2 m3/s
d) .55 m3/s
View Answer
a
Explanation: Q = 0.67 * Cd1 * L * √2g * H1.5 +. Cd2 * L * h * √2g(H – h)
= .67 * .6 * 3 * √2g * (.24 – .13)1.5 + .8 * 3 * .13 √2g(.24 – .13)
= .85 m3/s.
9 - Question
In discharge of water over narrow crested weir, discharge is directly proportional to the second power of height.
a) True
b) False
View Answer
b
Examples: In discharge of water over narrow crested weir, discharge is directly proportional to the one and half power of height.
10 - Question
In discharge of water over Ogee weir, discharge is directly proportional to the first power of length.
a) True
b) False
View Answer
a
Explanation: This is as per empirical relation.