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WT Exam #1
Term | Definition |
---|---|
Units that combine coagulation, flocculation, and sedimentation into a single basin are | Solids Contact Claifiers |
2 valves that operate 90 degrees open to shut are: | eccentric and butterfly |
Which of the following methods is best for determining the depth of water in a clear well | Bubbler |
Chlorine expands approximately how many times from liquid to gas? | 450 |
Normally calcium and magnesium ions are expressed as__________ when dealing with softening. | CaCo3 |
What is the logarithm of the reciprocal of the hydrogen ion activity? | pH |
Name two reverse flow conditions that cause backflow in a distribution system? | backpressure or backflow |
The nephlometric method of measuring turbidity is based on: | scattering of light |
What is the name of the nutrient poor portion of a lake? | Ogliotrophic |
What is the name of the nutrient rich portion of a lake? | Eutrophic |
The amount of water per foot of drawdown is commonly referred to as | Specific Capacity |
What must you do with the packing when repacking a pump? | Cut at least 2 pieces of packing and stagger the cuts 180 degrees |
What are the only 2 substances for which standards have been set pose an immediate threat to health when exceeded? | Bacteria and nitrates |
What is the C factor? | The measure of the roughness of the interior of a pipe |
Cracking, shrinkage, and mud balls in a filter are usually caused by | improper backwashing techniques |
Alkalinity consist predominantly in which of the following forms? | bicarbonate, carbonate, and hydroxide |
According to the safe water drinking act, the basic definition of a public water supply system is any water system that supplies water for human consumption that serves…… | 15 service connections or over 25 persons for over 60 days a year |
What is the most important test to indicate proper sedimentation? | Turbidity |