Water Treatment Practice Exam #2| 85 questions|
with complete solutions
What is a pathogen? Correct Answer: Disease-causing microorganisms.
What is the impact of algae to water quality? Correct Answer: Taste and odor problems.
What is the concentration of chlorine gas? Correct Answer: 100%.
Which of the following is not used to mix coagulants? Correct Answer: Horizontal paddle
wheel.
What is considered to be a quick remedy to adress a sudden increase in filtered water turbidity?
Correct Answer: Feed a filter-aid chemical to the filter influent.
What is the likely cause of a pinping noise in a pump? Correct Answer: Cavitation
Which of the following controls the efficiency of removing suspended solids in the
sedimentation process? Correct Answer: Flowrate
What is a sanitary survey? Correct Answer: An analisis to determine all potencial water quality
impacts to a proposed well.
Which of the following categories does bacterial belong to? Correct Answer: Colloidal
Under the Surface Water Treatment Rule, what must the reduction of viruses be through
filtration and disinfection? Correct Answer: 99.99%
Which of the following is not considered free residual chlorine? Correct Answer:
Monochloramine
Why is coliform used as a indicator organism? Correct Answer: It reduce the complexity and
cost of analysis.
What is an example of a non-community, non-transient water Correct Answer: School.
What is the purpose of a packing in a pump? Correct Answer: Control the leakege of water
along the pump shaft and prevent air from entering along the shaft when the pump is in a suction
lift condition.
What does the addition of carbon dioxide do to the pH of water? Correct Answer: Lowers it.
What is an unconfined aquifer? Correct Answer: One in which groundwater posseses a free
surface open to the atmosphere.
, What is static water level in a well? Correct Answer: Water level when pump is not running.
Which of the following Will least likely impact the formation of flocs during the coagulation and
flocculation process? Correct Answer: Hardness.
What is formed when free chlorine reacts with ammonia? Correct Answer: Chloramine.
Which contaminant causes Blue Baby Syndrome? Correct Answer: Nitrate.
What is free chlorine? Correct Answer: The concentration of residual chlorine in water which is
present as dissolved gas (CL2), hypochlorous acid (HOCI), and/or hypochlorite ion (OCI).
What is a thermocline? Correct Answer: A thin but distinct layer in a reservoir in which
temperature changes more rapidly with depth than it does in the layers above or below.
What agency protects the health and safety of industrial employees? Correct Answer: OSHA
What is the first priority in water treatment? Correct Answer: Production of safe drinking water.
What is the health effect of consuming water with high levels of lead? Correct Answer:
Cardiovascular effects, increased blood pressure and incidence of hypertension.
What is an imaginary surface to which ground water rises under hydrostatic pressure in Wells or
springs? Correct Answer: Piezometric surface
What is used to evaluate new coagulants or polymers being considered for use at the plant?
Correct Answer: Jar Test.
What are the 4 zones in a clarifier? Correct Answer: Inlet, Outlet, Settling, Sludge.
Which type of filtration process is approved by the Surface Water Treatment Rule? Correct
Answer: Conventional water treatment.
Which of the following impacts the color of source water? Correct Answer: Organics, such as
soil and leaves.
Coliform is most likely to be found in which of the following water supply? Correct Answer:
Lake.
What is the amount of water that can be withdrawn tion an aquifer whitout significant
environmental impact? Correct Answer: Safe yield.
pH will increaseif the following chemical is added to water. Correct Answer: Ammonia.
Which of the following is an unstable form of disinfection? Correct Answer: Ozonation.
with complete solutions
What is a pathogen? Correct Answer: Disease-causing microorganisms.
What is the impact of algae to water quality? Correct Answer: Taste and odor problems.
What is the concentration of chlorine gas? Correct Answer: 100%.
Which of the following is not used to mix coagulants? Correct Answer: Horizontal paddle
wheel.
What is considered to be a quick remedy to adress a sudden increase in filtered water turbidity?
Correct Answer: Feed a filter-aid chemical to the filter influent.
What is the likely cause of a pinping noise in a pump? Correct Answer: Cavitation
Which of the following controls the efficiency of removing suspended solids in the
sedimentation process? Correct Answer: Flowrate
What is a sanitary survey? Correct Answer: An analisis to determine all potencial water quality
impacts to a proposed well.
Which of the following categories does bacterial belong to? Correct Answer: Colloidal
Under the Surface Water Treatment Rule, what must the reduction of viruses be through
filtration and disinfection? Correct Answer: 99.99%
Which of the following is not considered free residual chlorine? Correct Answer:
Monochloramine
Why is coliform used as a indicator organism? Correct Answer: It reduce the complexity and
cost of analysis.
What is an example of a non-community, non-transient water Correct Answer: School.
What is the purpose of a packing in a pump? Correct Answer: Control the leakege of water
along the pump shaft and prevent air from entering along the shaft when the pump is in a suction
lift condition.
What does the addition of carbon dioxide do to the pH of water? Correct Answer: Lowers it.
What is an unconfined aquifer? Correct Answer: One in which groundwater posseses a free
surface open to the atmosphere.
, What is static water level in a well? Correct Answer: Water level when pump is not running.
Which of the following Will least likely impact the formation of flocs during the coagulation and
flocculation process? Correct Answer: Hardness.
What is formed when free chlorine reacts with ammonia? Correct Answer: Chloramine.
Which contaminant causes Blue Baby Syndrome? Correct Answer: Nitrate.
What is free chlorine? Correct Answer: The concentration of residual chlorine in water which is
present as dissolved gas (CL2), hypochlorous acid (HOCI), and/or hypochlorite ion (OCI).
What is a thermocline? Correct Answer: A thin but distinct layer in a reservoir in which
temperature changes more rapidly with depth than it does in the layers above or below.
What agency protects the health and safety of industrial employees? Correct Answer: OSHA
What is the first priority in water treatment? Correct Answer: Production of safe drinking water.
What is the health effect of consuming water with high levels of lead? Correct Answer:
Cardiovascular effects, increased blood pressure and incidence of hypertension.
What is an imaginary surface to which ground water rises under hydrostatic pressure in Wells or
springs? Correct Answer: Piezometric surface
What is used to evaluate new coagulants or polymers being considered for use at the plant?
Correct Answer: Jar Test.
What are the 4 zones in a clarifier? Correct Answer: Inlet, Outlet, Settling, Sludge.
Which type of filtration process is approved by the Surface Water Treatment Rule? Correct
Answer: Conventional water treatment.
Which of the following impacts the color of source water? Correct Answer: Organics, such as
soil and leaves.
Coliform is most likely to be found in which of the following water supply? Correct Answer:
Lake.
What is the amount of water that can be withdrawn tion an aquifer whitout significant
environmental impact? Correct Answer: Safe yield.
pH will increaseif the following chemical is added to water. Correct Answer: Ammonia.
Which of the following is an unstable form of disinfection? Correct Answer: Ozonation.
