1.
A repair job can be done by 7 people in 8.5 hours. How long will it take for 4 people to complete the same job?
2.
During a 24-hr period, a lift station in in a system serving a community of 27,000 people pumped 5000 gpm of wastewater. What was the quantity of wastewater generated per capita expressed on a daily basis? Assume the pump station ran 10 hours on the day in question,.
3.
A pump has a capacity of 8500 gpm and lifts wastewater against a total head of 39 feet. If the pump efficiency is 85%, what size of kW of motor is required?
4.
The interior of 1,275 feet of 60-inch pipe is uniformly coated with 2.75 inches of grease. How many gallons will this pipe hold when filled with water?
5.
If flow through a 10-in pipe is 722 gpm., what is the velocity in feet per second?
6.
An 8-in, main line needs to be flushed. The length of of pipeline to be flushed is 250 ft. How many minutes will it take to flush the line at 25 gpm?
7.
Calculate the pounds per square inch pressure at the bottom of a tank, if the water level is 33.11 ft deep?
8.
A centrifugal pump delivers 1890 liters per minute against a head of 300 feet with a combined pump and motor efficiency of 70%. What is the cost of the electrical power required to operate the pump 12 hours per day for 2 months? Assume each month has 31 days. The electrical cost is Php 0.06 per kWh
9.
A map with a scale of 0.875 inches = 100 feet indicates that manhole "A" is 11.20 inches from manhole "B". What is the actual distance between manholes?
10.
A wet well is 12 feet by 6 feet by 15 ft deep and the influent rate is 600 GPM. With the two pumps running, the level decreases 3'9" in 18 minutes. If pump "A" has a pumping rate of 425 GPM, what is the pumping rate of pump "B"? (Answer in GPM)
11.
A ball is dropped into a manhole, 2 minutes 18 seconds later, it is observed 500 feet away in downstream manhole. What is the velocity of the flow in FPS?
12.
How many gallons are there in pipe that is 18 inches in diameter and 216 feet long?
13.
A contractor is building a house with a basement elevation of 884.6 feet. The stub-out connection elevation is 876.5 feet. If the minimum allowable slope is 3/8 inch per foot, how far from the road can the builder place the house?
14.
Find the total head, in feet, for a pump with a total static head of 19 ft and a head loss of 3.7 feet.
15.
A four cylinder positive displacement pump has a cylinder bore of 4.5 inches with a stroke of 5.5 inches. The pump operates at 1,700 rpm. How long will it take to empty a 72-inch diameter wet well, 33.0 ft deep if it has an inflow of 2,500 gpm?
16.
What is the pressure head at a fire hydrant in feet, if the pressure gauge reads 121 psi?
17.
How many gallons of 6.00% sodium hypochlorite solution are needed to disinfect a 1.0 ft diameter pipeline that is 752 ft long? The required dosage is 25.0 mg/L
18.
Two columns of water are filled completely at sea level to a height of 88 ft. Column A is 0.5 inch in diameter. Column B is 5 inches in diameter. What will the two pressure gauges, each attached to the bottom of each column, read?
A.
A = 3.8 psi; B = 38.0 psi
B.
C.
A = 20.3 psi; B = 20.3 psi
D.
A = 38.0 psi; B = 38.0 psi
19.
What should the flow meter read in gallons per minute if a 12-in diameter main is to be flushed at 5.0 fps?
20.
The following flows were recorded for the months of February, March and April; Feb. = 197.3 cfs, March = 100,186.2 gpm, April = 255.7 mgd. What was the average daily flow for this three month period?
21.
Type response below