Pipes from three reservoirs meet at point C which is at elevation 366 m. Assume all pipes are PVC, with Hazen Williams C = 150. Pressure at point C is 18.3 psi.
Pipeline Diameter(inches) Length(ft)
x 10 10000
y 8 4000
z 12 5000
Find the head loss of pipeline x.
Solution:
The installation shown below is designed for filling tank trucks with water. The 10 inch line has an over-all length of 100 feet. The 6 inch line A is 10 feet long. The 6 inch line B is 40 ft. long. The Darcy-Weisbach factor f = 0.02. Neglecting minor losses, determine the discharge at A which can be delivered by this system when all the gate valves are fully open.
Solution:
A rectangular channel has a depth of 1.2m. and 1.8m. wide, with a normal flow at 5.62 m3/sec. Determine the type of flow for this channel.
Solution:
The length of weir of a reservoir is 200m. long. After heavy downpour the depth of water over the weir was 4m. If the total discharge through the weir was 1,000,000 m3, how long did the flow over the weir lasted?
Solution:
A rectangular channel (n = 0.015), 10.67m. wide is to carry water at a flow rate of 99.60 m3/sec. The slope of the channel is 0.0087. Determine the depth of flow.
Solution:
A dam 4m. on top, 18m. at the bottom and 24 m. high has water 20m. deep acting on its vertical side. What is the factor of safely against overturning? Assume weight of masonry to be 2400 kg/m3.
Solution:
A closed water tank 5m. high is half filled with water. A nozzle 0.075m. in diam. is attached at the side of the tank at a distance 0.5 m. above the bottom of the tank. The nozzle has coefficients of velocity Cv = 0.95 and coefficient of contraction Cc = 0.62. Compute the air pressure inside the tank to produced 10 hp. Energy at the nozzle.
Solution:
A contracted weir which is built in a rectangular channel has a length of weir of 1.407 m. and a height of water above the crest of 0.20m. Using Francis formula, determine the discharge flowing in the weir if it has two end contraction.
Solution:
A water tank is filled with water to a height of 4.3m. above the 10 mmØ orifice which is connected at the side of the tank, how far would the water have traveled horizontally if the orifice is 4.3m. above the ground?
Solution:
The results of a three consolidated drained tri-axial tests on saturated clay are as follows:
Cell Pressure Deviator Strees Pore Pressure
200 kPa 117 kPa 110 kPa
400 kPa 242 kPa 174.5 kPa
600 kPa 367 kPa 239 kPa
Compute the cohesion of the clay.
Solution:
A submerged plate 2m. by 3m. is placed vertically such that the 3m. horizontal side of the plate will be on the same level with water surface. Find the force exerted on one face of the plate.
Solution:
The results of a three consolidated drained tri-axial tests on saturated clay are as follows:
Cell Pressure Deviator Stress Pore Pressure
200 kPa 117 kPa 110 kPa
400 kPa 242 kPa 174.5 kPa
600 kPa 367 kPa 239 kPa
Compute the angle of internal friction of the clay.
Solution:
A large cylindrical tank has a diameter of 4m. and a height of 6m. If it is full of water, what is the pressure at a point 4.5m. below the water level?
Solution:
What is the ratio of the undrained and the unconfined compression strengths of clay soil.
a) 1.0
b) 0.50
c) 0.75
d) 0.25
Answer:
A sample soil compacted according to the standard Proctor Test has a unit weight of 131.1 pcf at 100 per cent compaction and at the optimum water content of 14 percent. If the voids became filled with water, what would be the saturated unit weight? Assume that the solid matter has a specific gravity of 2.67.
Solution:
A sand sample in a tri-axial test have the following normal stresses.
σ3 = 13 kPa σ1 = 33 kPa
σ3 = 24 kPa σ1 = 55 kPa
Compute the angle of internal friction.
Solution:
The following data were obtained from a field density test on a compacted fill of sandy clay. Laboratory moisture density tests on the fill material indicated a max. dry density of 120 pcf at an optimum water content of 11 percent.
Weight of moist soil remove from test hole = 1038 g
Weight of soil after oven drying = 914g
Volume of test tube hole from rubber balloon apparatus = 0.0169 cu.ft.
The value of the fill water content is:
Solution:
A sample of soil compacted according to the standard Proctor Test has a unit weight of 131.1 pcf at 100 percent compaction and at the optimum water content of 14 per cent. What is the dry unit at zero air voids? Assume that the solid matter has a specific gravity of 2.67.
Solution:
Pitot tube is used to measure:
a) dynamic pressure
b) total pressure
c) static pressure
d) velocity at the stagnation point
Answer:
Primary source of water supply.
a) precipitation
b) rainfall
c) perculation
d) surface runoff
Answer:
If a mass of liquid is translated horizontally at a constant acceleration of “a”, the tangent of the inclination θ of the liquid surface has a value of:
a) tan θ = a/g
b) tan θ = (a/g) + 1
c) tan θ = g/a
d) tan θ = (a+1)/g
Answer:
What is the character of a soil during liquid limit test?
a) flow curve
b) liquidity index
c) liquid limit
d) moisture content
Answer:
What do you call the water level having the same pressure.
a) isobar
b) parallel lines
c) stream line
d) none of these
Answer:
Water flowing in a trapezoidal channel 2m. wide at the bottom and at a depth of 0.9m. If the velocity of flow is 1.61 m/s and the sides are slope at 1.732 vertical in one horizontal, compute the slope of the channel. n = 0.020.
Solution:
The flow of water from a reservoir passes through a 12m. long spillway. If it takes 30 minutes to lower the surface from elevation 92 m. to elevation 91m., with crest elevation at 90m, compute the surface area of the reservoir. Use Francis formula:
Solution:
Which of the following is a device that regulates the distribution of flow of water.
a) hydrant
b) drain valve
c) sluice valve
d) water meter
Answer:
A dry air consists of different gases. Which of the following has the heaviest mass.
a) oxygen
b) Argon
c) Nitrogen
d) Carbon Dioxide
Answer:
It is a kind of soil test wherein first the mold or container is lined with Vaseline then a fully saturated soil is gradually poured to the mold.
a) compaction
b) shrinkage – limit test
c) moisture – density test
d) water content
Answer:
A rectangular weir having a length of 1m. is constructed at one end of a tank having a horizontal square section 10m. by 20m. and 10m. high. If the initial head on the time required to discharge a volume of 72m3. Use a correction factor C = 0.60.
Solution:
A 2m. clay layer has values of e = 0.92, Gs = 2.72 and a compression index Cc = 0.333. Above the clay is a sand layer of 3m. thick with e = 0.50 and Gs = 2.62. A water table was located 1.5m. below the ground surface (sand layer). If a 3m. thick back fill is placed over the existing ground surface, determine the consolidation settlement of the soft clay layer. Unit weight of back fill is 17.3 kN/m3.
Solution:
A tank contains three liquids oil (sp. gr. = 0.80), gasoline (sp. gr. = 0.90) and sea water (sp. gr. = 1.05) with a depth of 0.6 m., 0.4m., and 0.8m. respectively. An orifice 100mm in diam. is located at the bottom with a discharge of 0.029 m3/s. Determine the coefficient of discharge “C”.
Solution:
If the pressure head at a pumping station is 35m., what would be the pressure head at a distance of 8800m. from the pumping station if it discharges 0.40 m3/s. Use Hazen Williams formula with C = 100. Diam. of pipe is 600 mm.
Solution:
A soil has a known water content of 18% and a specific gravity of 2.68. Determine the degree of saturation if it has moist unit weight of 17.3 kN/m3.
Solution:
Water is flowing through a 600 mm diameter pipe n = 0.013 and 1000m. in length. A gage pressure downstream has a reading of 16 kPa and another gage in between the ends of the pipe reads 20 kPa while on the upstream side reads 30 kPa. Determine the total head loss in the pipe.
Solution:
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