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Exam (elaborations)

Water Treatment Class D (practice exam -1) Verified Solution

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  • Course
  • Water Treatment Class D
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  • 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...

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  • October 26, 2024
  • 8
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Water Treatment Class D
  • Water Treatment Class D
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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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