Determine the discharge in MLD in a 3000 mm gravity flow aqueduct if the depth of flow is 2400 mm. The slope of the hydraulic gridline is 0.0014 and the value of Mannings “n” is 0.016.
Solution:
A trapezoidal flume in the shape of a half hexagonal has abase width of 1.5m. It is laid at a slope “S”, has a roughness coefficient “n” and the discharge is 3.0 m3/sec. When flowing full. If the same material were used for the most efficient rectangular section, by how much would be the discharge decrease in cu.m. per sec.?
Solution:
A circular orifice is located 5m. below the water surface. If the tank is large and the diameter of the orifice is 5 mm, calculate the discharge in m3/sec. if the coefficient of discharge is 0.60.
Solution:
A vertical gate with width = 1.2 m. is submerged in liquid with top and bottom edge, 3m. and 6m. below the surface, respectively. If oil with sp.gr. = 0.80 occupies the top 1 meter of the liquid and the rest is water, calculate the force acting on the gate.
Solution:
The discharge over a rectangular suppressed weir is 0.333 cu.m/sec. Water stands 1.0 m. depth at the back of the weir. Find the length of crest of the weir if the head is 20cm. Consider velocity of approached and use Francis Formula.
Solution:
Piston A has a cross section of 1200 sq.cm. While that of piston B is 950 sq.cm. with the latter higher than piston A by 1.75m. If the intervening passages are filled with oil whose specific gravity is 0.80, what is the difference in pressure between A and B.
Solution:
If the maximum flow in a 5 meter wide rectangular channel is 10 cu.m./sec. what is the critical velocity in m/sec2. Use g = 9.81 m/sec2.
Solution:
Water flow in a 4m. wide rectangular channel. If the critical depth was measured to be 0.542m., what is the max. flow in cu.m./sec. use g = 9.81 m/sec2.
Solution:
A large air tight conical tank is filled with water 3.6m. above a nozzle located at its sides. The air pressure inside the tank is 20 kPa. If the side of the tank is inclined 15° from the vertical and the nozzle is perpendicular to the side of the tank, what is the horizontal component of the velocity of the jet?
Solution:
Run off from a 10 sq. km. drained area is discharge over a weir 45m. long If rainfall with an intensity of 30mm. per hour fell on the area, find the resulting head of the weir. Use Francis formula and neglect velocity of approach.
Solution:
In a tri axial test, a specimen of saturated (normally consolidated) clay was consolidated under a chamber confining pressure of 80 kPa. The axial stress on the specimen was then increased until the axial stress at failure was 120 kPa. The pore pressure (u) at the time was 30 kPa. Compute the consolidated undrained friction angle (phi).
Solution:
A clay layer 4m. thick rests beneath a deposit of submerged sand 8m. thick. The top of the sand is located 3m. below the surface of the lake. The saturated unit weights of sand and clay is 25 kN/m3. and 18 kN/m3. Compute the effective vertical pressure at mid-height of clay layer.
Solution:
A conduit, closed or open designed to convey water from a source to a point usually a reservoir where the distributed system begins.
a) Aqueduct
b) Gravity conduit
c) canal
d) flume
Answer:
The gravity-fet distribution system will have a flat or level hydraulic gradient or pressure surface when:
a) pipes are more bigger and bigger from the source to the end
b) there are no leaks and no withdrawal from the system
c) the term is flat
d) the pipe size are uniform
Answer:
The hydraulic and energy gradients for a straight pipe and uniform diameter are parallel with each other because of:
a) uniform velocity
b) uniform pressure drop
c) constant slope of pipe
d) none of these
Answer:
A sewer intended to carry only sanitary sewage.
a) sanitary sewer
b) outfall sewer
c) storm sewer
d) combined sewer
Answer:
Which of the statement is true.
a) center of buoyancy is always below the center of mass of stability
b) buoyant force on any body is equal to the fluid displaced
c) center of mass of displaced fluid is coincident with center of mass of an object
d) none of these
Answer:
In a flow net construction of determining seepage flow, the paths along which water can flow through a cross-section are called:
a) Equipotential lines
b) Flow lines
c) Flow diagrams
d) Flow nets
Answer:
In acceptable dosage, this process in water treatment is helpful in reducing the incidence of tooth decay.
a) Coagulation
b) Fluorosis
c) Calcium addition
d) Fluoridation
Answer:
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