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This quiz contains multiple-choice problems on orifice, notch and weir classification, large orifice flows, discharge over notches or weirs and time required to empty reservoir with notches and weirs.
When is an orifice said to be a ‘large orifice’?
If the head of liquid is less than 5 times the depth of orifice
If the head of liquid is less than 2.5 times the depth of orifice
If the head of liquid is less than 4 times the depth of orifice
If the head of liquid is less than 1.5 times the depth of orifice
In case of any orifice, velocity always remains constant and hence discharge can be calculated. True or false?
True
False
Find the discharge through a rectangular orifice 2.2 m wide and 1.3 m deep fitted to a tank if the team’s water level is 2.5 m above the top edge of the orifice.
13.9 m^3/s
11.5 m^3/s
16.9 m^3/s
8.7 m^3/s
Find the discharge through a rectangular orifice 3.2 m wide and 1.7 m deep fitted to a tank if the team’s water level is 3.3 m above the top edge of the orifice (take C{d} = 0.6).
29.4 m^3/s
58.5 m^3/s
67.9 m^3/s
78.7 m^3/s
The time taken to empty a tank is independent of C{d} but depends only on the height and acceleration due to gravity. True or false?
True
False
The discharge rate is independent of the height difference and dependent only on the height. True or false?
True
False
Find the discharge through a totally drowned orifice of width 2.3 m if the difference in water levels on both sides of the orifice is 40 cm. The height of water from to and bottom of the orifice are 2.6 m and 2.75 m respectively.
0.56 m^3/s
0.64 m^3/s
0.75 m^3/s
0.55 m^3/s
Find the discharge through a totally drowned orifice of width 3.3 m if the difference in water levels on both sides of the orifice is 50 cm. The height of water from to and bottom of the orifice are 2.25 m and 2.67 m respectively.
2.8 m^3/s
2.7 m^3/s
2.6 m^3/s
2.5 m^3/s
A rectangular orifice of 2 m width and 1.2 m deep is fitted on one side of a large tank. The easier level on one side of the orifice is 3 m above the top edge of the orifice while on the other side of the orifice, the water level is 0.5 m below the top edge. Calculate discharge if C{d} = 0.64.
4.95 m^3/s
5.67 m^3/s
3.56 m^3/s
6.75 m^3/s
The head of water over a rectangular weir is 38 cm. The length of the crest of the weir end contraction suppressed is 1.3 m. Find the discharge using the Francis formula.
0.56 m^3/s
0.75 m^3/s
0.85 m^3/s
0.69 m^3/s
The head of water over a rectangular weir is 28 cm. The length of the crest of the weir end contraction suppressed is 1.27 m. Find the discharge using the Francis formula.
0.346 m^3/s
0.556 m^3/s
0.788 m^3/s
0.225 m^3/s
Find the discharge over a Cipolletti weir of length 1.3 m when the head over the weir is 0.65 m (take C{d} = 0.60).
2.12 m^3/s
1.21 m^3/s
2.5 m^3/s
1.5 m^3/s
In the Francis empirical expression for discharge, the relation between head of water and discharge is
Q directly proportional to H
Q directly proportional to 1.5*H
Q directly proportional to 2.5*H
Q directly proportional to 0.5*H
The head of water over a rectangular weir is 26 cm. The length of the crest of weir end contraction suppressed is 1.25 m. Find the discharge using the Francis formula.
0.304 m^3/s
0.502 m^3/s
0.350 m^3/s
0.625 m^3/s
What is the reduction in crest length due to each end contraction?
0.1*H
0.2*H
0.15*H
0.25*H
