Joe Jorgensen
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Water Math distribution practice test

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Joe Jorgensen
Created by Joe Jorgensen almost 6 years ago
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Distribution Math Practice 2

Question 1 of 20

1

A pump discharge pressure indicates 60 psi. Find the discharge head in feet.

Select one of the following:

  • 25.9 feet

  • 60 feet

  • 138.6 feet

  • None of the above

Explanation

Question 2 of 20

1

Calculate the chlorine demand in ppm when the applied chlorine dosage is 3.0 mg/L and the chlorine residual is 2.5 mg/L

Select one of the following:

  • 0.5 ppm

  • 20 ppm

  • 5.5 ppm

  • 21 ppm

Explanation

Question 3 of 20

1

Find the total gallons of water pumped from a well over a 400 minute period, when the discharge rate is 1200 gpm through an 8 inch diameter pipe.

Select one of the following:

  • 480,000 gallons

  • 1,080,000 gallons

  • 1,440,000 gallons

  • 360,000 gallons

Explanation

Question 4 of 20

1

Find the total force in pounds exerted against a 10-inch diameter gate closed, when the up-stream line pressure is 110 psi?

Select one of the following:

  • 8639 lbs.

  • 2541 lbs.

  • 91.6 lbs.

  • 1110 lbs.

Explanation

Question 5 of 20

1

Find the pounds of 65% HTH required to disinfect a 12 inch diameter main 1000 feet long at a chlorine dose of 25 ppm? Find the pounds of HTH required.

Select one of the following:

  • 1.22 lbs.

  • 1.88 lbs.

  • 122 lbs.

  • 188 lbs.

Explanation

Question 6 of 20

1

Approximately how long could you provide water in hours and minutes, from a full reservoir measuring 32 feet high and 60 feet in diameter with a demand of 1800 gpm?

Select one of the following:

  • 5 hours, 15 minutes

  • 6 hours, 26 minutes

  • 6 hours, 16 minutes

  • 5 hours, 30 minutes

Explanation

Question 7 of 20

1

Approximately how long would it take to empty a reservoir through a 8 inch outlet flowing at a constant rate of 2 cfs, if the cylinderical tank has a height of 28 feet and a radius of 28 feet.

Select one of the following:

  • 27 hours, 15 minutes

  • 9 hours, 34 minutes

  • 9 hours, 57 minutes

  • 12 hours

Explanation

Question 8 of 20

1

Find the volume of water in acre feet contained in an 80 foot radius storage tank with a pressure transducer indicating 20 psi at the base of the tank?

Select one of the following:

  • 92.3 AF

  • 21.3 AF

  • 2.13 AF

  • 10.4 AF

Explanation

Question 9 of 20

1

At 8:00 am a pressure transducer used to measure water level indicates 12 psi for a 100 foot diameter water storage tank, at 6:00 pm the pressure transducer indicates 4 psi. Determine the gallons of water used during the 10 hour period.

Select one of the following:

  • 1,085,109 gallons

  • 542,554 gallons

  • 1,627,663 gallons

  • 145,067 gallons

Explanation

Question 10 of 20

1

Find the Total Dynamic Head of a pump that has a suction lift of 165 feet and a discharge pressure of 98 psi.

Select one of the following:

  • 226.38 feet

  • 61.38 feet

  • 391 feet

  • 263 feet

Explanation

Question 11 of 20

1

How many pounds per day are required to disinfect a flow of 5 MGD at a dose rate of 2.25 parts per million?

Select one of the following:

  • 938.25 lbs./Day

  • 93.8 lbs./Day

  • 9.38 lbs./Day

  • 8.39 lbs./Day

Explanation

Question 12 of 20

1

If 155 pounds per day of chlorine gas are required to disinfect a treatment plant at a dose rate of 1.25 ppm. What is the average flow in gallons per minute of the plant?

Select one of the following:

  • 5280 gpm

  • 10,980 gpm

  • 10,325 gpm

  • 12,575 gpm

Explanation

Question 13 of 20

1

Find the gallons per day of 12.5% sodium hypochlorite sp. Gr. 1.24 required to disinfect a well when the discharge flow is 800 gpm and the applied chlorine dose is 3.0 ppm?

Select one of the following:

  • 261.6 gallons/Day

  • 22.6 gallons/Day

  • 230.5 gallons/Day

  • 28.6 gallons/Day

Explanation

Question 14 of 20

1

A well operates at a rate of 1.5 cfs and for an average of 20 hours per day. The well is disinfected using chlorine gas at a rate of 0.75 ppm. Chlorine gas costs $1.07 per pound. What is the monthly chlorine cost to operate the well?

Select one of the following:

  • $162.20

  • $126.60

  • $107.00

  • $96.40

Explanation

Question 15 of 20

1

Determine the TDH for a well using the following data: discharge flow 2,200 gpm, static level 220 feet, pumpling level 305 feet, discharge pressure 103 psi. Also find the draw-down and specific yield or capacity?

Select one of the following:

  • 390 feet TDH, 85 feet Draw Dow, 5.6 gpm-ft.

  • 322 feet TDH, 85 feet Draw Dow, 1.8 gpm-ft.

  • 543 feet TDH, 85 feet Draw Dow, 26 gpm-ft.

  • 390 feet TDH, 85 feet Draw Dow, 1.8 gpm-ft.

Explanation

Question 16 of 20

1

A water storage tank is 35 feet tall with a 180 foot diameter. The water level transducer is sending out a 16mA signal. How many gallons are in the tank?

Select one of the following:

  • 5,280,567 gallons

  • 4,993,965 gallons

  • 667,642 gallons

  • 4,650,896 gallons

Explanation

Question 17 of 20

1

A water production facility produces an average of 20-acre feet of water per day. The chlorine dose rate is 0.75 mg/L. What is the cost to chlorinate over a 30 day period if the facility is using 12.5% sodium hypochlorite with a specific gravity of 1.22 and the cost is $2.30 per gallon?

Select one of the following:

  • $1,560.00

  • $2,211.30

  • $2,812.00

  • $961.25

Explanation

Question 18 of 20

1

Find the motor horsepower if the pump is flowing at 1850 gpm at a discharge pressure of 80 psi. The pump efficiency is 82% and the motor efficiency is 76%.

Select one of the following:

  • 250 hp

  • 225 hp

  • 138.5 hp

  • 125.8 hp

Explanation

Question 19 of 20

1

Your system operates 6 wells, each operating at 1250 gpm. The system demand requires 15 MGD. Calculate the cost to purchase additional water to meet the current water demands of 15 MGD when the purchase water costs $425/AF

Select one of the following:

  • $5477.96

  • $1288.76

  • $5280.00

  • $8236.75

Explanation

Question 20 of 20

1

How many pounds of calcium hypochlorite 65% are required to disinfect a well that is to be put back in service at a dose of 50 ppm. The well casing is 18 inches in diameter and a total of 700 feet deep and the water static water level is 425 feet, disinfect the portion of the well casing that is submerged under water.

Select one of the following:

  • 5.5 pounds

  • 2.33 pounds

  • 4.25 pounds

  • 3.44 pounds

Explanation