General Water Treatment-This is not a finished product and may contain typographical errors.

This is NOT an official WQA Practice exam

General Water Treatment (50)

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1. Methemoglobinemia is caused by high bacteria content in the drinking water.

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2. Water with a pH of 5 is acidic.

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3. The rotten egg odor of hydrogen sulfide is apparent in concentrations as low as______________.

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4. To disinfect water by boiling, water should be kept at boiling point for a minimum of______________.

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5. The words "pure, healthy, safe" clean" should be clearly defined by the user or regulation.

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6. At a uniform flow rate there is more than twice as much pressure loss in 100 feet of  1/2" pipe than there is in 100 feet of 1" pipe.

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7. The use of a water softener will neither cause nor correct corrosion problems.

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8. A hydroxide ion is:

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9. Distilled Water carries about the same amount of electric current as soft water.

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10. When present in water, all bacteria are classified as pathogens.

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11. ln the ion exchange softening process, sodium ions are exchanged for calcium or magnesium ions on a chemically equivalent basis. What is this equivalent basis?

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12. Pure water is a great electrical insulator.

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13. The last step in every installation should be:

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14. A water softener should be installed prior to a UV light when there is more than ______ gpg of hardness in the water.

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15. At what level of iron is pretreatment recommended for a reverse osmosis system? 

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