Water Treatment Class D (Practice
Exam #3) questions well answers
What is the criteria for a community water system? - correct answer ✔✔Has at least 15 service
connections used by all year residents, or regularly serves at least 25 all year residents
What is the acceptable limit of copper in drinking water? - correct answer ✔✔1.3 mg/L
Which type of reservoir is rich in nutrients? - correct answer ✔✔eutrophic
What is a mechanical seal? - correct answer ✔✔Metallic flat surfaces used to minimize leakage
around the pump shaft.
What is a confined aquifer? - correct answer ✔✔An aquifer that is bounded above and below
by confining beds
Which of the following best describes pumping water level in a well? - correct answer
✔✔Upper surface of the groundwater that is being pumped
What is the name of the deepest layer of a reservoir under thermal stratification ? - correct
answer ✔✔hypolimnion
What is the health effect of consuming water with high levels of copper? - correct answer
✔✔Stomach and intestinal distress such as nausea, vomiting, diarrhea and stomach cramps
Which of the following best describes a turbine pump? - correct answer ✔✔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? - correct
answer ✔✔Chain and flight collectors
How often should preventative maintenance be performed on equipment? - correct answer
✔✔Use manufacturer's recommendation.
What is CT? - correct answer ✔✔Contact time x chlorine residual concentration
What is absorption? - correct answer ✔✔Constituent is sucked in
What is the purpose of a check valve? - correct answer ✔✔Allows water to flow in one
direction, and prevents reverse flow
What would happen to the pH of water if lime is added? - correct answer ✔✔increases pH
What is the term used to describe groundwater that flows naturally from the ground? - correct
answer ✔✔Spring
Once thermal stratification occurs in the middle and lower zones of a reservoir, what type of
problem occurs in these layers? - correct answer ✔✔Depletion of total dissolved oxygen
What is the most critical problem that may be encountered when entering a confined space? -
correct answer ✔✔Oxygen deficiency and toxic gas
Which of the following is a settleable solid? - correct answer ✔✔Sand
Exam #3) questions well answers
What is the criteria for a community water system? - correct answer ✔✔Has at least 15 service
connections used by all year residents, or regularly serves at least 25 all year residents
What is the acceptable limit of copper in drinking water? - correct answer ✔✔1.3 mg/L
Which type of reservoir is rich in nutrients? - correct answer ✔✔eutrophic
What is a mechanical seal? - correct answer ✔✔Metallic flat surfaces used to minimize leakage
around the pump shaft.
What is a confined aquifer? - correct answer ✔✔An aquifer that is bounded above and below
by confining beds
Which of the following best describes pumping water level in a well? - correct answer
✔✔Upper surface of the groundwater that is being pumped
What is the name of the deepest layer of a reservoir under thermal stratification ? - correct
answer ✔✔hypolimnion
What is the health effect of consuming water with high levels of copper? - correct answer
✔✔Stomach and intestinal distress such as nausea, vomiting, diarrhea and stomach cramps
Which of the following best describes a turbine pump? - correct answer ✔✔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? - correct
answer ✔✔Chain and flight collectors
How often should preventative maintenance be performed on equipment? - correct answer
✔✔Use manufacturer's recommendation.
What is CT? - correct answer ✔✔Contact time x chlorine residual concentration
What is absorption? - correct answer ✔✔Constituent is sucked in
What is the purpose of a check valve? - correct answer ✔✔Allows water to flow in one
direction, and prevents reverse flow
What would happen to the pH of water if lime is added? - correct answer ✔✔increases pH
What is the term used to describe groundwater that flows naturally from the ground? - correct
answer ✔✔Spring
Once thermal stratification occurs in the middle and lower zones of a reservoir, what type of
problem occurs in these layers? - correct answer ✔✔Depletion of total dissolved oxygen
What is the most critical problem that may be encountered when entering a confined space? -
correct answer ✔✔Oxygen deficiency and toxic gas
Which of the following is a settleable solid? - correct answer ✔✔Sand
