WATER NUGGETS TEST 1 QUESTIONS & ANSWERS
1. Assuming all other variables remain the same, a decrease in the pH when using free
chlorine would?
Increase the C . T required and decrease the inactivation ratio
Increase the C . T required and increase the inactivation ratio
Decrease the C . T required and Decrease the inactivation ratio
Decrease the C . T required and increase the inactivation ratio - Answers - Decrease
the C . T required and increase the inactivation ratio
2. What membrane process is used to treat brackish water or seawater?
Ultrafiltration
Reverse Osmosis
Nanofiltration
Microfiltration - Answers - Reverse Osmosis
3. The more hydroxide ions
The more basic the solution
The more acidic the solution
The more more hydroactive
The more radioactive the solution - Answers - The more basic the solution
4. A grout seal should be?
Installed 12" from the floor
Have a backflow isntalled on it
Requires Screen Bars to keep rodents out
Filled with cement grout to a minimum of 10' down - Answers - Filled with cement grout
to a minimum of 10' down
5. What are total dissolved minerals in rainwater typically close to?
10.00 mg/L
48.00 mg/L
40.00 mg/L
1.00 mg/L - Answers - 10.00 mg/L
6. What happens when there is high algae growth in a reservoir?
DO and pH Decrease while CO2 Increase
DO and pH Increase while CO2 Decrease
DO, pH and CO2 Decrease
,DO, pH and CO2 Increase - Answers - DO and pH Increase while CO2 Decrease
7. Fluoride concentration above what mg/L will likely cause teeth to become pitted?
.01 mg/L
2 mg/L
4 mg/L
5 mg/L - Answers - 4 mg/L
8. What part of the human body is the most vulnerable to allowing microorganisms to
enter it?
Stomach
Throat
Heart
Eyes - Answers - Eyes
9. What can immediately occur if newly installed manganese greensand was not
skimmed of the fines after backwashing and stratification steps were completed?
Mudball Formation
Shorter Filter Runs
Cracks Would Develop in the Bed
Uneven Flow Through the Bed - Answers - Shorter Filter Runs
10. For maximum charge neutralization the average zeta potential should be in what
range?
-90 to 0
0 to +3
-60 to -24
-3 to -1 - Answers - 0 to +3
11. What does it mean if there are sand boils on the surfaces of rapid sand filters during
backwash?
There is not enough backwash water being reused and the operator should use raw
water
The backwash valves are being opened too quickly
The Flux Capacitor is Clogged
All of the above - Answers - The backwash valves are being opened too quickly
12. Why is turbidity in drinking water undesirable?
It provides a medium for the transmission of pathogens in drinking water
, Can turn drinking water varying colors
Can cause odor complaints
Causes aesthetic issues in water which will results in complaints - Answers - It
provides a medium for the transmission of pathogens in drinking water
13. What should the flexible copper tubing be rated at the connects a 150lb chlorine
cylinder to a manifold?
25 psi
100 psi
250 psi
500 psi - Answers - 500 psi
14. What is used for detection of chlorine gas leaks?
10% solution of ammonia sulfide
10% solution of sulfuric acid
10% solution of ammonia hydroxide
10% solution of ammonia hyfluxide - Answers - 10% solution of ammonia hydroxide
15. In a permit entry confined space, who is responsible for terminating entries?
Entry Supervisor
State or Local Official
Person Who Enters the Confined Space
USEPA - Answers - Entry Supervisor
16. What type of sedimentation basins have the flow of water admitted at an angle?
Spiral Flow Basins
Center Feed Settling Basins
Square Settling Basins
Rectangular Settling Basins - Answers - Spiral Flow Basins
17. According to the Surface Water Treatment Rule, multiple barrier treatment is defined
as?
Coagulation, Flocculation, Sedimentation, and Filtration
Coagulation, Flocculation, and Filtration
Removal by filtration and inactivation by disinfection
Coagulation, Sedimentation, and Filtration - Answers - Removal by filtration and
inactivation by disinfection
18. The temperature range at which coliform bacteria samples must be stored before
being delivered to a lab is?
1. Assuming all other variables remain the same, a decrease in the pH when using free
chlorine would?
Increase the C . T required and decrease the inactivation ratio
Increase the C . T required and increase the inactivation ratio
Decrease the C . T required and Decrease the inactivation ratio
Decrease the C . T required and increase the inactivation ratio - Answers - Decrease
the C . T required and increase the inactivation ratio
2. What membrane process is used to treat brackish water or seawater?
Ultrafiltration
Reverse Osmosis
Nanofiltration
Microfiltration - Answers - Reverse Osmosis
3. The more hydroxide ions
The more basic the solution
The more acidic the solution
The more more hydroactive
The more radioactive the solution - Answers - The more basic the solution
4. A grout seal should be?
Installed 12" from the floor
Have a backflow isntalled on it
Requires Screen Bars to keep rodents out
Filled with cement grout to a minimum of 10' down - Answers - Filled with cement grout
to a minimum of 10' down
5. What are total dissolved minerals in rainwater typically close to?
10.00 mg/L
48.00 mg/L
40.00 mg/L
1.00 mg/L - Answers - 10.00 mg/L
6. What happens when there is high algae growth in a reservoir?
DO and pH Decrease while CO2 Increase
DO and pH Increase while CO2 Decrease
DO, pH and CO2 Decrease
,DO, pH and CO2 Increase - Answers - DO and pH Increase while CO2 Decrease
7. Fluoride concentration above what mg/L will likely cause teeth to become pitted?
.01 mg/L
2 mg/L
4 mg/L
5 mg/L - Answers - 4 mg/L
8. What part of the human body is the most vulnerable to allowing microorganisms to
enter it?
Stomach
Throat
Heart
Eyes - Answers - Eyes
9. What can immediately occur if newly installed manganese greensand was not
skimmed of the fines after backwashing and stratification steps were completed?
Mudball Formation
Shorter Filter Runs
Cracks Would Develop in the Bed
Uneven Flow Through the Bed - Answers - Shorter Filter Runs
10. For maximum charge neutralization the average zeta potential should be in what
range?
-90 to 0
0 to +3
-60 to -24
-3 to -1 - Answers - 0 to +3
11. What does it mean if there are sand boils on the surfaces of rapid sand filters during
backwash?
There is not enough backwash water being reused and the operator should use raw
water
The backwash valves are being opened too quickly
The Flux Capacitor is Clogged
All of the above - Answers - The backwash valves are being opened too quickly
12. Why is turbidity in drinking water undesirable?
It provides a medium for the transmission of pathogens in drinking water
, Can turn drinking water varying colors
Can cause odor complaints
Causes aesthetic issues in water which will results in complaints - Answers - It
provides a medium for the transmission of pathogens in drinking water
13. What should the flexible copper tubing be rated at the connects a 150lb chlorine
cylinder to a manifold?
25 psi
100 psi
250 psi
500 psi - Answers - 500 psi
14. What is used for detection of chlorine gas leaks?
10% solution of ammonia sulfide
10% solution of sulfuric acid
10% solution of ammonia hydroxide
10% solution of ammonia hyfluxide - Answers - 10% solution of ammonia hydroxide
15. In a permit entry confined space, who is responsible for terminating entries?
Entry Supervisor
State or Local Official
Person Who Enters the Confined Space
USEPA - Answers - Entry Supervisor
16. What type of sedimentation basins have the flow of water admitted at an angle?
Spiral Flow Basins
Center Feed Settling Basins
Square Settling Basins
Rectangular Settling Basins - Answers - Spiral Flow Basins
17. According to the Surface Water Treatment Rule, multiple barrier treatment is defined
as?
Coagulation, Flocculation, Sedimentation, and Filtration
Coagulation, Flocculation, and Filtration
Removal by filtration and inactivation by disinfection
Coagulation, Sedimentation, and Filtration - Answers - Removal by filtration and
inactivation by disinfection
18. The temperature range at which coliform bacteria samples must be stored before
being delivered to a lab is?
