Water Treatment Class D (practice exam -1) Verified Solution
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Module
Water Treatment Class D
Institution
Water Treatment Class D
If 2.5mg/L of chlorine is dosed, and there is 0.5mg/L of residual, what is the reason for the residual? - ANS - The residual is present as a safeguard for unanticipated chlorine demand in the distribution system
Which of the following must always be done before repairing a pump? - ANS - Lock o...
Water Treatment Class D (practice exam
#1) Verified Solution
Which of the following is removed at the water intake? - ANS ✔ - Fish and debris
Which of the following is more likely to be found in groundwater? - ANS ✔ - Minerals
What is most commonly used to control algae growth in reservoirs? - ANS ✔ - Copper sulfate
What are common filtration rates in gravity filtration? - ANS ✔ - 2 to 10GPM/sq.ft.
Leakage within a centrifugal pump is intended for what purpose? - ANS ✔ - Cool moving parts
Which of the following is the definition of a grab sample? - ANS ✔ - A single sample of water collected
at a particular time and place which represents the composition of the water only at that time and
place
Adding sodium hypochlorite to water will have the following effect - ANS ✔ - Increase pH
What is the purpose of the Groundwater Rule? - ANS ✔ - To protect the groundwater from disease-
causing microorganisms
What is true about the Total Coliform Rule? - ANS ✔ - Establishes an MCL based on the presence and
absence of total coliforms or E. coli.
What will happen to the water quality if chlorine is injected at the same location as power activated
carbon (PAC) - ANS ✔ - Chlorine will react with carbon and neutralize the effects of both
, Water Treatment Class D (practice exam
#1) Verified Solution
Which of the following will react with chlorine to form trihalomethane? - ANS ✔ - Natural organic
matter
What type of pump has a piston within the casing? - ANS ✔ - reciprocating
What must be located near a hazardous chemical storage room? - ANS ✔ - SDS
What Term describes the depression of a water table? - ANS ✔ - Cone of depression
What is the radius of influence? - ANS ✔ - The radial distance from the center of a well bore to the
point where there is no lowering of the water table
What is the best way to monitor filter performance? - ANS ✔ - turbidity
What causes the water to look cloudy? - ANS ✔ - suspended material
Which chemical is sprayed near a chlorine gas leak to produce white smoke? - ANS ✔ - ammonia
Which water sampling parameters must be taken in the field? - ANS ✔ - pH and temperature
If the total coliform tests positive, then what must be done next? - ANS ✔ - Test for fecal coliform
What is performed to evaluate susceptibility to potential threats and identify corrective actions that
can reduce or mitigate the risk for a water system? - ANS ✔ - Vulnerability assessment
What is the definition of holding time for water samples? - ANS ✔ - The length of time a water sample
is retained between taking the sample and laboratory analysis
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