WATER TREATMENT FINAL EXAM | LATEST UPDATED | ACTUAL
EXAM QUESTIONS WITH SOLUTIONS | 100% RATED CORRECT |
100% VERFIED SOLTIONS | ALREADY GRADED A+
Whats a rapid method of estimating total dissolved content of a water supply? -
(ANSWER)Specific conductance
Waterfall aeration devices may cause what type of problems? - (ANSWER)Encourage biological
growth
If a person is poisoned by inhaling fluoride what is the first symptom? - (ANSWER)Sharp biting
pain to the nose followed by a runny nose or a nose bleed
Drinking water waste is considered what type of waste? - (ANSWER)Industrial
pH kept at ____ will precipitate calcium carbonate? - (ANSWER)10
Excess pink water can be caused by what? - (ANSWER)Potassium permanganate overdose
Pressure in a distribution system should not fall below what level? - (ANSWER)20psi
What is the MCL for Trihalomethanes - (ANSWER)0.08 milligrams per liter
Shortened filter runs can occur because of air bound filters, why is this? - (ANSWER)Caused by
the release of dissolved air in saturated cold water due to a decrease in pressure
What is the most expensive aeration device? - (ANSWER)Mechanical
,In the Ion exchange process, calcium(Ca) and magnesium(Mg) Ions are exchanged for what? -
(ANSWER)Na- Ions
What are the four stages of the operation of an ion exchange softener? - (ANSWER)Service,
Brine, Backwash, Rinse
What is the chief cause of accidents? - (ANSWER)Carelessness/ negligence
Drinking water should be free of what 2 things? - (ANSWER)Bacteria and toxins
Ton tanks have how many fusible metal safety plugs on each ends? - (ANSWER)3 to 4- each
side
If you have positive sample for total coliform, do what? - (ANSWER)Repeat samples are
required (3) tap upstream and downstream
Filters are clogged by what, that can cause head loss? - (ANSWER)Algae/ aquatic micro
organisms
What is the meaning of eutrophic - (ANSWER)High nutrient content
What is a bubbler tube used for? - (ANSWER)Measuring the depths of a well
What is the primary advantage of vacuum system chlorination? - (ANSWER)Safety
When chlorine and ammonia are added to water what is formed? - (ANSWER)Chloramines
What is tapered energy mixing? - (ANSWER)Reduction of speed or surface area of the paddle or
basin
,What is the best appearance of a floc particle? - (ANSWER)Discrete (separate) fairly dense
What is a cross connection? - (ANSWER)Connection between a drinking water supply and a
unapproved water supply
What is the meaning of MCL? - (ANSWER)Maximum contaminant level, (largest allowable
amount)
What is multi media? - (ANSWER)Sand , anthracite coal, garnet
Hydrochloric acid reacts with what to form hydrogen gas? - (ANSWER)Metal
Venturi's propellar meters, etc .... Are used to measure what? - (ANSWER)Flows
Why should lime and alum sludge never be mixed? - (ANSWER)Could cause an explosion
What is the most common problem due to algae? - (ANSWER)Taste and odors
An increase in lime will have effect on pH? - (ANSWER)Increase pH
How do you check for chlorine leaks? - (ANSWER)Ammonia soaked rags
What effect does chlorine gas have on water? - (ANSWER)Lowers the pH
The addition of caustic soda will have what effect on alkalinity? - (ANSWER)Increase alkalinity
What is the common coagulant? - (ANSWER)Alum
, What is the most important control in a solid contact unit? - (ANSWER)Maintaining the sludge
blanket
What is a reason for using chloramines or chloride dioxide? - (ANSWER)Very little or no THMs
are formed
What measuring device provide the most convenient and most repeatable chloride residual
results? - (ANSWER)Amperometric titration
If excess like does not lower the hardness, what chemical should you add? - (ANSWER)Sodium
carbonate
What gives the best disinfection potential? - (ANSWER)Contact time
If you are feeding a hypochlorite solution and clogging occurs, what is the problem? -
(ANSWER)Calcium deposit on the poppet valve
What is used to clean calcium deposits off the poppet valve? - (ANSWER)Dilute Hydrochloric
acid solution
Source water has a high concentration of calcium and lime is not working, what should you use?
- (ANSWER)Caustic soda- soda ash
What happens when hard water mixes with fluoride? - (ANSWER)Scale formation
Where is the first place you notice floc carryover? - (ANSWER)Filter
What is the pH where alkalinity is most stable? - (ANSWER)7.7
EXAM QUESTIONS WITH SOLUTIONS | 100% RATED CORRECT |
100% VERFIED SOLTIONS | ALREADY GRADED A+
Whats a rapid method of estimating total dissolved content of a water supply? -
(ANSWER)Specific conductance
Waterfall aeration devices may cause what type of problems? - (ANSWER)Encourage biological
growth
If a person is poisoned by inhaling fluoride what is the first symptom? - (ANSWER)Sharp biting
pain to the nose followed by a runny nose or a nose bleed
Drinking water waste is considered what type of waste? - (ANSWER)Industrial
pH kept at ____ will precipitate calcium carbonate? - (ANSWER)10
Excess pink water can be caused by what? - (ANSWER)Potassium permanganate overdose
Pressure in a distribution system should not fall below what level? - (ANSWER)20psi
What is the MCL for Trihalomethanes - (ANSWER)0.08 milligrams per liter
Shortened filter runs can occur because of air bound filters, why is this? - (ANSWER)Caused by
the release of dissolved air in saturated cold water due to a decrease in pressure
What is the most expensive aeration device? - (ANSWER)Mechanical
,In the Ion exchange process, calcium(Ca) and magnesium(Mg) Ions are exchanged for what? -
(ANSWER)Na- Ions
What are the four stages of the operation of an ion exchange softener? - (ANSWER)Service,
Brine, Backwash, Rinse
What is the chief cause of accidents? - (ANSWER)Carelessness/ negligence
Drinking water should be free of what 2 things? - (ANSWER)Bacteria and toxins
Ton tanks have how many fusible metal safety plugs on each ends? - (ANSWER)3 to 4- each
side
If you have positive sample for total coliform, do what? - (ANSWER)Repeat samples are
required (3) tap upstream and downstream
Filters are clogged by what, that can cause head loss? - (ANSWER)Algae/ aquatic micro
organisms
What is the meaning of eutrophic - (ANSWER)High nutrient content
What is a bubbler tube used for? - (ANSWER)Measuring the depths of a well
What is the primary advantage of vacuum system chlorination? - (ANSWER)Safety
When chlorine and ammonia are added to water what is formed? - (ANSWER)Chloramines
What is tapered energy mixing? - (ANSWER)Reduction of speed or surface area of the paddle or
basin
,What is the best appearance of a floc particle? - (ANSWER)Discrete (separate) fairly dense
What is a cross connection? - (ANSWER)Connection between a drinking water supply and a
unapproved water supply
What is the meaning of MCL? - (ANSWER)Maximum contaminant level, (largest allowable
amount)
What is multi media? - (ANSWER)Sand , anthracite coal, garnet
Hydrochloric acid reacts with what to form hydrogen gas? - (ANSWER)Metal
Venturi's propellar meters, etc .... Are used to measure what? - (ANSWER)Flows
Why should lime and alum sludge never be mixed? - (ANSWER)Could cause an explosion
What is the most common problem due to algae? - (ANSWER)Taste and odors
An increase in lime will have effect on pH? - (ANSWER)Increase pH
How do you check for chlorine leaks? - (ANSWER)Ammonia soaked rags
What effect does chlorine gas have on water? - (ANSWER)Lowers the pH
The addition of caustic soda will have what effect on alkalinity? - (ANSWER)Increase alkalinity
What is the common coagulant? - (ANSWER)Alum
, What is the most important control in a solid contact unit? - (ANSWER)Maintaining the sludge
blanket
What is a reason for using chloramines or chloride dioxide? - (ANSWER)Very little or no THMs
are formed
What measuring device provide the most convenient and most repeatable chloride residual
results? - (ANSWER)Amperometric titration
If excess like does not lower the hardness, what chemical should you add? - (ANSWER)Sodium
carbonate
What gives the best disinfection potential? - (ANSWER)Contact time
If you are feeding a hypochlorite solution and clogging occurs, what is the problem? -
(ANSWER)Calcium deposit on the poppet valve
What is used to clean calcium deposits off the poppet valve? - (ANSWER)Dilute Hydrochloric
acid solution
Source water has a high concentration of calcium and lime is not working, what should you use?
- (ANSWER)Caustic soda- soda ash
What happens when hard water mixes with fluoride? - (ANSWER)Scale formation
Where is the first place you notice floc carryover? - (ANSWER)Filter
What is the pH where alkalinity is most stable? - (ANSWER)7.7
