WATER OPERATOR CLASS 3: PRACTICE TEST QUESTIONS
WITH CORRECT ANSWERS
What is hydraulic grade line? -- Answer ✔✔ Head pressure at various points
An RPZ backflow preventor is used for -- Answer ✔✔ tall buildings
Electric motors in a water plant accounts for what percent of the total electrical use? --
Answer ✔✔ 90%
Excessive nitrates in water causes: -- Answer ✔✔ Methemoglobinemia
Filter beds should expand ____ when backwashing. -- Answer ✔✔ 50%
When a reservoir is rich in nutrients such as phosphates and nitrogen, its condition is: --
Answer ✔✔ Eutrophic
How would you start a power management program? -- Answer ✔✔ ID each source of
energy use.
,What is an end point? -- Answer ✔✔ Color change at end of titration
The MCL for nitrates is? -- Answer ✔✔ 10 mg/L
What is the IDHL level for chlorine gas? -- Answer ✔✔ 10 ppm
If you breath chlorine gas, you should drink: -- Answer ✔✔ Milk
Name two situations that can cause a well screen to become clogged -- Answer ✔✔
Iron bacteria, calcium hardness
How do you notify the public about an acute MCL violation on a community system? --
Answer ✔✔ Paper 14 days, Radio or TV 72 hrs., Mail 45 days
Three ways algae can affect filter plants are: -- Answer ✔✔ Clog intake screens, affect
coagulation, shorten filter runs
____ is the indicator and ____is the titrant when testing for chlorides. -- Answer ✔✔
Potassium chromate, silver nitrate
What is the MCL for coliform if you take 40 or more samples per month? -- Answer
✔✔ No more than 5% of samples
, What determines the quality of the water entering the distribution system from a filter
plant? -- Answer ✔✔ Quality of water leaving filter
What is a coupon used for? -- Answer ✔✔ Detect corrosiveness
A fully open chlorine bottle is how many turns? -- Answer ✔✔ 1 turn
Chlorine repair kit "A" is used for -- Answer ✔✔ 150 bottle
Back siphonage can be prevented by using a -- Answer ✔✔ Vacuum breaker
Chlorine dioxide is made by mixing -- Answer ✔✔ Sodium chlorite and chlorine
Why is ozone made on site? -- Answer ✔✔ It is unstable
A multistage pump can create a large amount of -- Answer ✔✔ Head pressure
Pump curves can include horsepower, efficiency and ____ -- Answer ✔✔ flow
Overlubrication can cause bearings in a centri pump to -- Answer ✔✔ Overheat
Water soaking down through soil is -- Answer ✔✔ Percolation
WITH CORRECT ANSWERS
What is hydraulic grade line? -- Answer ✔✔ Head pressure at various points
An RPZ backflow preventor is used for -- Answer ✔✔ tall buildings
Electric motors in a water plant accounts for what percent of the total electrical use? --
Answer ✔✔ 90%
Excessive nitrates in water causes: -- Answer ✔✔ Methemoglobinemia
Filter beds should expand ____ when backwashing. -- Answer ✔✔ 50%
When a reservoir is rich in nutrients such as phosphates and nitrogen, its condition is: --
Answer ✔✔ Eutrophic
How would you start a power management program? -- Answer ✔✔ ID each source of
energy use.
,What is an end point? -- Answer ✔✔ Color change at end of titration
The MCL for nitrates is? -- Answer ✔✔ 10 mg/L
What is the IDHL level for chlorine gas? -- Answer ✔✔ 10 ppm
If you breath chlorine gas, you should drink: -- Answer ✔✔ Milk
Name two situations that can cause a well screen to become clogged -- Answer ✔✔
Iron bacteria, calcium hardness
How do you notify the public about an acute MCL violation on a community system? --
Answer ✔✔ Paper 14 days, Radio or TV 72 hrs., Mail 45 days
Three ways algae can affect filter plants are: -- Answer ✔✔ Clog intake screens, affect
coagulation, shorten filter runs
____ is the indicator and ____is the titrant when testing for chlorides. -- Answer ✔✔
Potassium chromate, silver nitrate
What is the MCL for coliform if you take 40 or more samples per month? -- Answer
✔✔ No more than 5% of samples
, What determines the quality of the water entering the distribution system from a filter
plant? -- Answer ✔✔ Quality of water leaving filter
What is a coupon used for? -- Answer ✔✔ Detect corrosiveness
A fully open chlorine bottle is how many turns? -- Answer ✔✔ 1 turn
Chlorine repair kit "A" is used for -- Answer ✔✔ 150 bottle
Back siphonage can be prevented by using a -- Answer ✔✔ Vacuum breaker
Chlorine dioxide is made by mixing -- Answer ✔✔ Sodium chlorite and chlorine
Why is ozone made on site? -- Answer ✔✔ It is unstable
A multistage pump can create a large amount of -- Answer ✔✔ Head pressure
Pump curves can include horsepower, efficiency and ____ -- Answer ✔✔ flow
Overlubrication can cause bearings in a centri pump to -- Answer ✔✔ Overheat
Water soaking down through soil is -- Answer ✔✔ Percolation
