Water
DRIVERSupplyOPERATOR
SystemsMOBILE WATER
Overview
SUPPLY 2026 QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTION |ALREADY
GRADED A+ NEWEST UPDATE
1. Where is a curb stop is usually located?
utility water main
corporation stop outlet
property line
side of a building
2. The difference between the amount of chlorine added to water and the
chlorine residual remaining in the water after a given contact time is?
Chlorine Demand
Chlorine Residual
Chlorine Withdrawal Rate
THM's
3. Gate valves are normally used in a distribution system because they
are easier to install
have less friction loss
hold tighter
operate easier
4. A main pipe or conduit through which a public or community water system
,coveys water to all service connections.
Service pipe
Water Main
Water Distributing Pipe
, None of the above
5. Convert 2,500,000 gallons to million gallons per day (MGD):
2.5 MGD
2.0 MGD
2.75 MGD
3.0 MGD
6. Which of the following should be avoided as a permanent landmark for
identifying the location of water distribution system components?
Concrete markers
Metal stakes
Trees
Plastic flags
7. The recommended maximum continuous flow rate through a 5/8" x 3/4"
displacement type meter is?
15 gpm
10 gpm
20 gpm
7.5 gpm
8. There is 7.48 gallons per cubic foot. How many gallons of water are in a
pipe 8 feet in diameter and 10 feet long?
26
80
3758
, 748
9. What is the required minimum level of total chlorine residual in a water
distribution system to ensure adequate disinfection throughout all areas?
0.5 mg/l
1.0 mg/l
1.5 mg/l
2.0 mg/l
10. The invert of a pipe channel or manhole is the ___________ of the pipe channel
or manhole .
Highest inside the point
Lowest inside the point
Mid-way or Center line
11. Which of the following is not true about calcium hypochlorite?
Safety precaution includes wearing rubber gloves and a face shield
when working with calcium hypochlorite
Calcium hypochlorite typically contains 65% available chlorine by
weight
Calcium hypochlorite could react with organics and start a fire
When calcium hypochlorite is added to water, it will lower the pH
12. Why should you have at least 20 psi in the distribution system at all times?
To flush the mains
To prevent contamination
To fight fires
To provide sufficient water to customers
DRIVERSupplyOPERATOR
SystemsMOBILE WATER
Overview
SUPPLY 2026 QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTION |ALREADY
GRADED A+ NEWEST UPDATE
1. Where is a curb stop is usually located?
utility water main
corporation stop outlet
property line
side of a building
2. The difference between the amount of chlorine added to water and the
chlorine residual remaining in the water after a given contact time is?
Chlorine Demand
Chlorine Residual
Chlorine Withdrawal Rate
THM's
3. Gate valves are normally used in a distribution system because they
are easier to install
have less friction loss
hold tighter
operate easier
4. A main pipe or conduit through which a public or community water system
,coveys water to all service connections.
Service pipe
Water Main
Water Distributing Pipe
, None of the above
5. Convert 2,500,000 gallons to million gallons per day (MGD):
2.5 MGD
2.0 MGD
2.75 MGD
3.0 MGD
6. Which of the following should be avoided as a permanent landmark for
identifying the location of water distribution system components?
Concrete markers
Metal stakes
Trees
Plastic flags
7. The recommended maximum continuous flow rate through a 5/8" x 3/4"
displacement type meter is?
15 gpm
10 gpm
20 gpm
7.5 gpm
8. There is 7.48 gallons per cubic foot. How many gallons of water are in a
pipe 8 feet in diameter and 10 feet long?
26
80
3758
, 748
9. What is the required minimum level of total chlorine residual in a water
distribution system to ensure adequate disinfection throughout all areas?
0.5 mg/l
1.0 mg/l
1.5 mg/l
2.0 mg/l
10. The invert of a pipe channel or manhole is the ___________ of the pipe channel
or manhole .
Highest inside the point
Lowest inside the point
Mid-way or Center line
11. Which of the following is not true about calcium hypochlorite?
Safety precaution includes wearing rubber gloves and a face shield
when working with calcium hypochlorite
Calcium hypochlorite typically contains 65% available chlorine by
weight
Calcium hypochlorite could react with organics and start a fire
When calcium hypochlorite is added to water, it will lower the pH
12. Why should you have at least 20 psi in the distribution system at all times?
To flush the mains
To prevent contamination
To fight fires
To provide sufficient water to customers
