WATER DISTRIBUTION MATH EXAM – QUESTIONS
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1. A pipe delivers 600 gallons in 3 minutes. What is the flow rate in gallons per minute?
A. 100 gpm
B. 150 gpm
C. 200 gpm
D. 250 gpm
Correct Answer: C. 200 gpm
Rationale:
Flow rate is calculated by dividing total gallons by time. 600 ÷ 3 = 200 gallons per minute.
2. A water tank contains 12,000 gallons and loses 500 gallons per hour. How many hours
will it take to empty?
A. 24 hours
B. 20 hours
C. 18 hours
D. 30 hours
Correct Answer: A. 24 hours
Rationale:
The emptying time equals total volume divided by loss rate. 12,000 ÷ 500 = 24 hours.
3. A pump produces 750 gallons per minute for 2 hours. How many gallons are pumped?
A. 45,000 gallons
B. 60,000 gallons
C. 75,000 gallons
D. 90,000 gallons
Correct Answer: D. 90,000 gallons
,Rationale:
Two hours equals 120 minutes. Multiply 750 × 120 to obtain 90,000 gallons.
4. What is the area of a circular reservoir with a radius of 10 feet?
A. 100 square feet
B. 314 square feet
C. 628 square feet
D. 157 square feet
Correct Answer: B. 314 square feet
Rationale:
Area of a circle equals πr². Using 3.14 × 10² gives approximately 314 square feet.
5. A distribution operator records a pressure of 60 psi. Approximately how many feet of
head does this represent?
A. 92.4 feet
B. 120 feet
C. 138.6 feet
D. 150 feet
Correct Answer: C. 138.6 feet
Rationale:
Feet of head equals psi multiplied by 2.31. 60 × 2.31 = 138.6 feet.
6. A tank level rises from 8 feet to 14 feet. What is the increase in water depth?
A. 4 feet
B. 5 feet
C. 6 feet
D. 7 feet
Correct Answer: C. 6 feet
Rationale:
Subtract the starting depth from the ending depth. 14 − 8 = 6 feet.
7. A chlorination system feeds 4 pounds of chlorine over 8 hours. What is the feed rate per
hour?
A. 0.25 lb/hr
B. 0.5 lb/hr
C. 1 lb/hr
D. 2 lb/hr
,Correct Answer: B. 0.5 lb/hr
Rationale:
Divide total chlorine by total time. 4 ÷ 8 = 0.5 pounds per hour.
8. A customer uses 9,000 gallons in 30 days. What is the average daily use?
A. 200 gallons
B. 250 gallons
C. 300 gallons
D. 350 gallons
Correct Answer: C. 300 gallons
Rationale:
Average daily use equals total consumption divided by days. 9,000 ÷ 30 = 300 gallons.
9. A storage tank is 20 feet high and half full. What is the water depth?
A. 5 feet
B. 8 feet
C. 10 feet
D. 12 feet
Correct Answer: C. 10 feet
Rationale:
Half of the total height is calculated by dividing 20 by 2, resulting in 10 feet.
10. A 500-foot pipe section must be replaced. If each pipe segment is 20 feet long, how
many segments are needed?
A. 20
B. 22
C. 25
D. 30
Correct Answer: C. 25
Rationale:
Divide total pipe length by segment length. 500 ÷ 20 = 25 segments.
11. A water main carries 1,200 gpm. How many gallons pass through in 30 minutes?
A. 24,000 gallons
B. 30,000 gallons
C. 36,000 gallons
D. 42,000 gallons
, Correct Answer: C. 36,000 gallons
Rationale:
Multiply flow rate by time. 1,200 × 30 = 36,000 gallons.
12. A meter reading changes from 125,400 gallons to 140,900 gallons. How much water was
used?
A. 14,500 gallons
B. 15,500 gallons
C. 16,500 gallons
D. 17,500 gallons
Correct Answer: B. 15,500 gallons
Rationale:
Subtract the earlier reading from the later reading. 140,900 − 125,400 = 15,500 gallons.
13. A pump efficiency test shows 80% efficiency. What percentage is lost?
A. 10%
B. 15%
C. 20%
D. 25%
Correct Answer: C. 20%
Rationale:
Subtract the efficiency percentage from 100%. 100 − 80 = 20%.
14. A circular tank has a diameter of 30 feet. What is the radius?
A. 10 feet
B. 12 feet
C. 15 feet
D. 18 feet
Correct Answer: C. 15 feet
Rationale:
Radius equals half the diameter. 30 ÷ 2 = 15 feet.
15. A utility requires 2 mg/L chlorine dosage for 1 million gallons. Approximately how many
pounds of chlorine are needed?
A. 8.34 pounds
B. 12.5 pounds
AND ANSWERS | VERIFIED AND WELL DETAILED
ANSWERS | PLUS RATIONALES | GUARANTEED
PASS | LATEST EXAM UPDATE | STUVIA VERIFIED |
EXAM PREP | STUDY GUIDE | PRACTICE TEST
1. A pipe delivers 600 gallons in 3 minutes. What is the flow rate in gallons per minute?
A. 100 gpm
B. 150 gpm
C. 200 gpm
D. 250 gpm
Correct Answer: C. 200 gpm
Rationale:
Flow rate is calculated by dividing total gallons by time. 600 ÷ 3 = 200 gallons per minute.
2. A water tank contains 12,000 gallons and loses 500 gallons per hour. How many hours
will it take to empty?
A. 24 hours
B. 20 hours
C. 18 hours
D. 30 hours
Correct Answer: A. 24 hours
Rationale:
The emptying time equals total volume divided by loss rate. 12,000 ÷ 500 = 24 hours.
3. A pump produces 750 gallons per minute for 2 hours. How many gallons are pumped?
A. 45,000 gallons
B. 60,000 gallons
C. 75,000 gallons
D. 90,000 gallons
Correct Answer: D. 90,000 gallons
,Rationale:
Two hours equals 120 minutes. Multiply 750 × 120 to obtain 90,000 gallons.
4. What is the area of a circular reservoir with a radius of 10 feet?
A. 100 square feet
B. 314 square feet
C. 628 square feet
D. 157 square feet
Correct Answer: B. 314 square feet
Rationale:
Area of a circle equals πr². Using 3.14 × 10² gives approximately 314 square feet.
5. A distribution operator records a pressure of 60 psi. Approximately how many feet of
head does this represent?
A. 92.4 feet
B. 120 feet
C. 138.6 feet
D. 150 feet
Correct Answer: C. 138.6 feet
Rationale:
Feet of head equals psi multiplied by 2.31. 60 × 2.31 = 138.6 feet.
6. A tank level rises from 8 feet to 14 feet. What is the increase in water depth?
A. 4 feet
B. 5 feet
C. 6 feet
D. 7 feet
Correct Answer: C. 6 feet
Rationale:
Subtract the starting depth from the ending depth. 14 − 8 = 6 feet.
7. A chlorination system feeds 4 pounds of chlorine over 8 hours. What is the feed rate per
hour?
A. 0.25 lb/hr
B. 0.5 lb/hr
C. 1 lb/hr
D. 2 lb/hr
,Correct Answer: B. 0.5 lb/hr
Rationale:
Divide total chlorine by total time. 4 ÷ 8 = 0.5 pounds per hour.
8. A customer uses 9,000 gallons in 30 days. What is the average daily use?
A. 200 gallons
B. 250 gallons
C. 300 gallons
D. 350 gallons
Correct Answer: C. 300 gallons
Rationale:
Average daily use equals total consumption divided by days. 9,000 ÷ 30 = 300 gallons.
9. A storage tank is 20 feet high and half full. What is the water depth?
A. 5 feet
B. 8 feet
C. 10 feet
D. 12 feet
Correct Answer: C. 10 feet
Rationale:
Half of the total height is calculated by dividing 20 by 2, resulting in 10 feet.
10. A 500-foot pipe section must be replaced. If each pipe segment is 20 feet long, how
many segments are needed?
A. 20
B. 22
C. 25
D. 30
Correct Answer: C. 25
Rationale:
Divide total pipe length by segment length. 500 ÷ 20 = 25 segments.
11. A water main carries 1,200 gpm. How many gallons pass through in 30 minutes?
A. 24,000 gallons
B. 30,000 gallons
C. 36,000 gallons
D. 42,000 gallons
, Correct Answer: C. 36,000 gallons
Rationale:
Multiply flow rate by time. 1,200 × 30 = 36,000 gallons.
12. A meter reading changes from 125,400 gallons to 140,900 gallons. How much water was
used?
A. 14,500 gallons
B. 15,500 gallons
C. 16,500 gallons
D. 17,500 gallons
Correct Answer: B. 15,500 gallons
Rationale:
Subtract the earlier reading from the later reading. 140,900 − 125,400 = 15,500 gallons.
13. A pump efficiency test shows 80% efficiency. What percentage is lost?
A. 10%
B. 15%
C. 20%
D. 25%
Correct Answer: C. 20%
Rationale:
Subtract the efficiency percentage from 100%. 100 − 80 = 20%.
14. A circular tank has a diameter of 30 feet. What is the radius?
A. 10 feet
B. 12 feet
C. 15 feet
D. 18 feet
Correct Answer: C. 15 feet
Rationale:
Radius equals half the diameter. 30 ÷ 2 = 15 feet.
15. A utility requires 2 mg/L chlorine dosage for 1 million gallons. Approximately how many
pounds of chlorine are needed?
A. 8.34 pounds
B. 12.5 pounds
