Water Treatment Exam #2 UPDATED ACTUAL Questions and
CORRECT Answers
Question: What is a pathogen?
Correct Answer: Disease-causing microorganisms.
Question: What is the impact of algae to water quality?
Correct Answer: Taste and odor problems.
Question: What is the concentration of chlorine gas?
Correct Answer: 100%.
Question: Which of the following is not used to mix coagulants?
Correct Answer: Horizontal paddle wheel.
Question: 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.
Question: What is the likely cause of a pinping noise in a pump?
Correct Answer: Cavitation
Question: Which of the following controls the efficiency of removing suspended solids in the
sedimentation process?
Correct Answer: Flowrate
Question: What is a sanitary survey?
Correct Answer: An analisis to determine all potencial water quality impacts to a proposed well.
Question: Which of the following categories does bacterial belong to?
Correct Answer: Colloidal
Question: Under the Surface Water Treatment Rule, what must the reduction of viruses be through
filtration and disinfection?
Correct Answer: 99.99%
Question: Which of the following is not considered free residual chlorine?
Correct Answer: Monochloramine
Question: Why is coliform used as a indicator organism?
Correct Answer: It reduce the complexity and cost of analysis.
Question: What is an example of a non-community, non-transient water
Correct Answer: School.
Question: 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.
, Question: What does the addition of carbon dioxide do to the pH of water?
Correct Answer: Lowers it.
Question: What is an unconfined aquifer?
Correct Answer: One in which groundwater posseses a free surface open to the atmosphere.
Question: What is static water level in a well?
Correct Answer: Water level when pump is not running.
Question: Which of the following Will least likely impact the formation of flocs during the coagulation and
flocculation process?
Correct Answer: Hardness.
Question: What is formed when free chlorine reacts with ammonia?
Correct Answer: Chloramine.
Question: Which contaminant causes Blue Baby Syndrome?
Correct Answer: Nitrate.
Question: 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).
Question: 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.
Question: What agency protects the health and safety of industrial employees?
Correct Answer: OSHA
Question: What is the first priority in water treatment?
Correct Answer: Production of safe drinking water.
Question: What is the health effect of consuming water with high levels of lead?
Correct Answer: Cardiovascular effects, increased blood pressure and incidence of hypertension.
Question: What is an imaginary surface to which ground water rises under hydrostatic pressure in Wells or
springs?
Correct Answer: Piezometric surface
Question: What is used to evaluate new coagulants or polymers being considered for use at the plant?
Correct Answer: Jar Test.
Question: What are the 4 zones in a clarifier?
Correct Answer: Inlet, Outlet, Settling, Sludge.
Question: Which type of filtration process is approved by the Surface Water Treatment Rule?
Correct Answer: Conventional water treatment.
CORRECT Answers
Question: What is a pathogen?
Correct Answer: Disease-causing microorganisms.
Question: What is the impact of algae to water quality?
Correct Answer: Taste and odor problems.
Question: What is the concentration of chlorine gas?
Correct Answer: 100%.
Question: Which of the following is not used to mix coagulants?
Correct Answer: Horizontal paddle wheel.
Question: 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.
Question: What is the likely cause of a pinping noise in a pump?
Correct Answer: Cavitation
Question: Which of the following controls the efficiency of removing suspended solids in the
sedimentation process?
Correct Answer: Flowrate
Question: What is a sanitary survey?
Correct Answer: An analisis to determine all potencial water quality impacts to a proposed well.
Question: Which of the following categories does bacterial belong to?
Correct Answer: Colloidal
Question: Under the Surface Water Treatment Rule, what must the reduction of viruses be through
filtration and disinfection?
Correct Answer: 99.99%
Question: Which of the following is not considered free residual chlorine?
Correct Answer: Monochloramine
Question: Why is coliform used as a indicator organism?
Correct Answer: It reduce the complexity and cost of analysis.
Question: What is an example of a non-community, non-transient water
Correct Answer: School.
Question: 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.
, Question: What does the addition of carbon dioxide do to the pH of water?
Correct Answer: Lowers it.
Question: What is an unconfined aquifer?
Correct Answer: One in which groundwater posseses a free surface open to the atmosphere.
Question: What is static water level in a well?
Correct Answer: Water level when pump is not running.
Question: Which of the following Will least likely impact the formation of flocs during the coagulation and
flocculation process?
Correct Answer: Hardness.
Question: What is formed when free chlorine reacts with ammonia?
Correct Answer: Chloramine.
Question: Which contaminant causes Blue Baby Syndrome?
Correct Answer: Nitrate.
Question: 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).
Question: 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.
Question: What agency protects the health and safety of industrial employees?
Correct Answer: OSHA
Question: What is the first priority in water treatment?
Correct Answer: Production of safe drinking water.
Question: What is the health effect of consuming water with high levels of lead?
Correct Answer: Cardiovascular effects, increased blood pressure and incidence of hypertension.
Question: What is an imaginary surface to which ground water rises under hydrostatic pressure in Wells or
springs?
Correct Answer: Piezometric surface
Question: What is used to evaluate new coagulants or polymers being considered for use at the plant?
Correct Answer: Jar Test.
Question: What are the 4 zones in a clarifier?
Correct Answer: Inlet, Outlet, Settling, Sludge.
Question: Which type of filtration process is approved by the Surface Water Treatment Rule?
Correct Answer: Conventional water treatment.
