Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
What is the usual strength of sodium hypochlorite, i.e., available chlorine? |
5 percent to 15 percent |
|
|
|
About how much alkalinity is required for each milligram per liter of alum added to raw water? |
0.5 mg/L |
|
|
|
What metals are most likely to leach from household plumbing and cause a health hazard? |
Copper and lead |
|
|
|
How many gallons are in 2,167 ft3? |
16,253 gal |
(7.5gal)/1ft3 (2,167ft3)= 16,252.5 gal |
|
|
Covert 91 Fahrenheit to degrees Celsius |
33 degrees Celsius |
Op flow February 2008 |
|
|
Measure of a smoothness of a pipe |
C value |
|
|
|
The main break may cause loss of pressure and the distribution system, which in turn may result in |
contamination of the system by backsiphonage |
|
|
|
As water temperature increases, the disinfecting action of chlorine is |
more effective |
|
|
|
Which of the following best defines a cone of depression? |
Depression around The Well of the water surface caused by pumping water from the well |
|
|
|
Which is the term for water samples collected at regular intervals and combined and equal volume with each other? |
Time composite samples |
|
|
|
Which of the following do long filter runs tend to cause? |
Slime growths |
|
|
|
The filter medium DE filters is |
diatomaceous earth |
|
|
|
Which type of pipe is typically used in the construction of a very large water mains? |
Steel |
|
|
|
Air Relief valves are installed to |
Ventaire that has accumulated in the well column while the well is not in use |
|
|
|
What type of level sensor requires an air supply? |
Bubbler tube |
|
|
|
What is the first action of an operator should take if a large main break occurs? |
Locate the valves that isolate the leak |
|
|
|
What is the primary health risk of trihalomethanes? |
Cancer |
|
|
|
Algae can shorten filter runs by |
clogging filters |
|
|
|
If poorly formed floc is leaving the settling basin, which of the following should be done? |
Increase the coagulant or add a coagulant aid |
|
|
|
Which of the following chemicals can be activated for use as a coagulant aid with alum? |
Sodium silicate |
|
