Math

Question 1

Velocity formula

Answer 1

Velocity = Distance/Time

Question 2

Flow rate equation

Answer 2

Q = Velocity x Area

Question 3

Volume of a cylinder

Answer 3

V=πr²H

Question 4

A Water storage tank contains 2,400 Cubic feet of water. How many gallons of water are in the tank?

Answer 4

17,952 Gal
Equation
(Length, ft) x (Width, ft) x (Height, ft) x 7.48 gal/cu. ft.

Question 5

How many gallons of water are in a circular water storage tank 20 feet in diameter when the water is 6 feet deep?

Answer 5

14,092 Gal
Equation
(0.785) x (Dia, ft)2 x (Height, Depth, or Length in ft.) x 7.48 gal/ft3

Question 6

How many pounds of water are in a tank that contains 2,000 Gallons of water?

Answer 6

16,680 lbs
To find pounds multiply Gallons by 8.33
1 Gal = 8.33 pounds

Question 7

A pressure gauge on a fire hydrant reads 75 feet of pressure head . What is the pressure in pounds per square inch ?

1. 34.6 psi
2. 26.0 psi
3. 32.5 psi
4. 39.0 psi
5. 37.1 psi

Answer 7

32.5
Formula
(Head, ft x 0.4335 psi/ft )
75 x 0.4335= 32.5

Question 8

During pressure testing of a distribution system, a pressure gauge reads 35 pounds per square inch. What is the pressure head in feet ?

1. 75 ft
2. 92 ft
3. 69 ft
4. 81 ft
5. 104 ft

Answer 8

81 ft
Formula
Pounds/square inch x 2.31
35 x 2.31= 80.85 -> round to 81ft

Question 9

A pipe is teated during a 6-hour leak test on 600 feet of 6-inch diameter plastic pipe with a test pressure of 150 pounds per square inch(psi). The pipes are 10 feet long. During the 6 hour test period 8 gallons of water were added to maintain the 150 psi pressure. What is the actual leakage from this se took of pipe in gallons per hour 100 joints ?

1. 2.2 gal/h/100 joints
2. 1.4 gal/h/ 100 joints
3. 2.8 gal/h/ 100 joints
4. 2.5 gal /h/ 100 joints
5. 1.6 gal/h/ 100 joints

Answer 9

2.2 gal/h/ 100 joints

Question 10

What is the actual leakage in gallons per day per mile per inch from a new section of pipe if the leak rate during the test period was 40 gallons per day ? The section tested is 0.30 miles long and the pipe diameter is 15 inches

1. 13 gpd/mi
2. 5 gpd/ mi
3. 7 gpd/ mi
4. 9 gpd/ mi
5. 11 gpd/ mi

Answer 10

9 gpd

Question 11

What is the chemical feed of chlorine in pounds per day from a hypochlorinator if the hypochlorite solution is 1.5 percent or 15,000 milligrams chlorine per liter? During a test run, the hypochlorinator delivers 500 milliliter a in 12 minutes .

1. 1.8/lb/d
2. 1.6/lb/d
3. 1.3/lb/d
4. 1.0/lb/d
   5: 2.0/lb/d

Answer 11

2.0/lb/d

Question 12

What horse power must a pump deliver to water that must be lifted 100 feet when the flow is 100 gallons per minute?

1. 3.16 hp
2. 2.90
3. 2.02 hp
4. 2.27 hp
5. 2.53

Answer 12

2.53 hp
Formula
(GPM)x(total head,Ft)
—————————————-
(3960 gal/min/ft)

100gpmx100ft
—————————=2.52 (round)
3960

Question 13

A trench 4 feet wide, 600 feet long, and 6 feet deep is to be excavated for a water main. How many cubic yards of soil must be excavated for the water main?

1. 948 yd(3)
2. 729 yd(3)
3. 370 yd(3)
4. 237 yd(3)
5. 533 yd(3)

Answer 13

533 yd (3)

Question 14

During a test of totalizing flowmeter, the water depth rose 15 inches in a tank 18 inches in diameter. What was the total flow in gallons?

1. 17 gal
2. 29 gal
3. 66 gal
4. 39 gal
5. 49 gal

Answer 14

17 gal

Question 15

How many kilowatt hours per day are required by a pump with a motor horsepower of 35 horsepower when the pump operates 8 hours per day?

1. 209 kWh/d
2. 149 kWh/d
3. 179 kWh/d
4. 284 kWh/d
5. 328 kWh/d

Answer 15

209 kWh/d