MASS DRINKING WATER DISTRIBUTION GRADE 1 STUDY
GUIDE TEST WITH LATEST UPDATED (QUESTIONS AND
ANSWERS) ALREADY PASSED!
After a new water mains is installed and pressure tested it should be
Correct Answers Filled with a solution of 25ppm to 50ppm free chlorine
for at least 24 hours prior to flushing
as the temperature of water increases the disinfection process Correct
Answers more effective
water with a ph of 8.0 is considered Correct Answers basic
what is a low voltage electrical system that is used to prevent rust
corrosion and pitting of metal surfaces in contact with water Correct
Answers cathodic protection
Which conventional treatment step is eliminated by direct filtration
Correct Answers Sedimentation
A granular white powder used for disinfection Correct Answers Calcium
hypochlorite
What is the chlorine dose Correct Answers Chlorine demand plus
chlorine residual
, what is a cross connection Correct Answers an unprotected connection
between a drinking water supply and a system not approved as safe
what is an air gap separation device Correct Answers a vertical empty
space that seperates a drinking water suppy from an unapproved water
system
breakpoint chlorination is the addition of chlorine into the water until
what occurs Correct Answers the chlorine demand has been satisfied
what is the main difference between using hypochlorite compounds and
chlorine gas Correct Answers the % of available chlorine
what is disenfection Correct Answers process that kills or inactivates
most microorganism and pathogens
why is backflow a concern for water distribution systems Correct
Answers flow from a non potable water source could contaminate the
water system
which of the following has caused more waterborne disease outbreaks
than any other reported factor Correct Answers cross connection
contamination
what contaminant causes methemoglobinemia Correct Answers nitrate
GUIDE TEST WITH LATEST UPDATED (QUESTIONS AND
ANSWERS) ALREADY PASSED!
After a new water mains is installed and pressure tested it should be
Correct Answers Filled with a solution of 25ppm to 50ppm free chlorine
for at least 24 hours prior to flushing
as the temperature of water increases the disinfection process Correct
Answers more effective
water with a ph of 8.0 is considered Correct Answers basic
what is a low voltage electrical system that is used to prevent rust
corrosion and pitting of metal surfaces in contact with water Correct
Answers cathodic protection
Which conventional treatment step is eliminated by direct filtration
Correct Answers Sedimentation
A granular white powder used for disinfection Correct Answers Calcium
hypochlorite
What is the chlorine dose Correct Answers Chlorine demand plus
chlorine residual
, what is a cross connection Correct Answers an unprotected connection
between a drinking water supply and a system not approved as safe
what is an air gap separation device Correct Answers a vertical empty
space that seperates a drinking water suppy from an unapproved water
system
breakpoint chlorination is the addition of chlorine into the water until
what occurs Correct Answers the chlorine demand has been satisfied
what is the main difference between using hypochlorite compounds and
chlorine gas Correct Answers the % of available chlorine
what is disenfection Correct Answers process that kills or inactivates
most microorganism and pathogens
why is backflow a concern for water distribution systems Correct
Answers flow from a non potable water source could contaminate the
water system
which of the following has caused more waterborne disease outbreaks
than any other reported factor Correct Answers cross connection
contamination
what contaminant causes methemoglobinemia Correct Answers nitrate
