Exam (elaborations)
Water Treatment Class D( Practice Exam #3)
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- Water Treatment Class D
Water Treatment Class D( Practice Exam #3)
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Water Treatment Class D( Practice Exam#3)
What is the criteria for a community water system? - -Has at least 15 service
connections used by all year residents,or regularly serves at least 25 all yesr
residents
-What is the acceptable limit of copper in drinking water? - -1.3 mg/L
-Which type of reservoir is rich in nutrients? - -eutrophic
-What is a mechanical seal? - -Metallic flat surfaces used to minimize
leakage around the pump shaft.
-What is a confined aquifer? - -An aquifer that is bounded above and below
by confining beds
-Which of the following best describes pumping water level in a well? - -
Upper surface of the groundwater that is being pumped
-What is the name of the deepest layer of a reservoir under thermal
stratification ? - -hypolimnion
-What is the health effect of consuming water with high levels of copper? - -
Stomach and intestinal distress such as nausea, vomiting, diarrhea and
stomach cramps
-Which of the following best describes a turbine pump? - -A centrifugal
pump that is mainly used to pump water from wells
-What is typically used to clean the sludge on the bottom of a rectangular
clarifier? - -Chain and flight collectors
-How often should preventative maintenance be performed on equipment? -
-Use manufacturer's recommendation.
-What is CT? - -Contact time x chlorine residual concentration
-What is absorption? - -Constituent is sucked in
-What is the purpose of a check valve? - -Allows water to flow in one
direction, and prevents reverse flow
-What would happen to the pH of water if lime is added? - -increases pH
, -What is the term used to describe groundwater that flows naturally from
the ground? - -Spring
-Once thermal stratification occurs in the middle and lower zones of a
reservoir, what type of problem occurs in these layers? - -Depletion of total
dissolved oxygen
-What is the most critical problem that may be encountered when entering a
confined space? - -Oxygen deficiency and toxic gas
-Which of the following is a settleable solid? - -Sand
-Which of the following is not a commonly used coagulant? - -sodium
hypochlorite
-What is the purpose of a coagulant aid? - -Add density to slow-settling flocs
and add toughness to the flocs.
-What is the purpose of coagulant( not coagulant aid)? - -Neutralize
electrical charge.
-Which of the following is least likely to be removed in the sedimentation
process? - -Aqueous form of manganese
-In the sedimentation process, what would happen if the flowrate were
increased? - -lower efficiency
-If turbidity is rising rapidly,what should you do? - -Verify the effectiveness
of the coagulant chemicals and dosage at the flash mixer
-The collection of a bad sample is useful as which of the following? - -No
result
-Which of the following is not a mechanism that occurs in a filter media? - -
precipitation
-Which of the following is not a type of filter media used for gravity
filtration? - -diatomaceous earth
-What are the three types of media used in a multi media filtration system? -
-sand, anthracite coal, garnet
-What does the term "fluidized" mean in filtration? - -Filter media is
expanded during backwash
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