Mass Drinking Water Distribution
Grade 1 Study Guide With Complete
Solutions !!
After a new water mains is installed and pressure tested it should be - ANSWER-
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 - ANSWER-more
effective
water with a ph of 8.0 is considered - ANSWER-basic
what is a low voltage electrical system that is used to prevent rust corrosion and
pitting of metal surfaces in contact with water - ANSWER-cathodic protection
Which conventional treatment step is eliminated by direct filtration - ANSWER-
Sedimentation
A granular white powder used for disinfection - ANSWER-Calcium hypochlorite
What is the chlorine dose - ANSWER-Chlorine demand plus chlorine residual
what is a cross connection - ANSWER-an unprotected connection between a
drinking water supply and a system not approved as safe
what is an air gap separation device - ANSWER-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 -
ANSWER-the chlorine demand has been satisfied
what is the main difference between using hypochlorite compounds and chlorine gas
- ANSWER-the % of available chlorine
what is disenfection - ANSWER-process that kills or inactivates most microorganism
and pathogens
why is backflow a concern for water distribution systems - ANSWER-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 - ANSWER-cross connection contamination
, what contaminant causes methemoglobinemia - ANSWER-nitrate
what is the physical connection direct or indirect which provides the opportunity for
nonpotable water to enter a conduit pipe or receptacle containing potable water -
ANSWER-cross connection
what are two most important safety concerns when entering an confined space -
ANSWER-oxygen deficiency and hazardous gasses
what contaminant causes methemoglobinemia - ANSWER-nitrate
a public water supply uses chlorine for disinfection what is the point called when all
chlorine demand has been met and any further addition of chlorine results in a
proportional increase in free chlorine residual - ANSWER-breakpoint chlorination
which us agency establishes drinking water standards - ANSWER-USEPA
it is the duty of the water purveyor to deliver potable water of adequate quantity as
far as the: - ANSWER-customers tap
the safe drinking water act definition of a public water supply system is a water
system that has at least 15 service connections or serves at least 25 or more people
for at least ___ days per year - ANSWER-60 days
which of the following terms refers to excessive internal water pressure which may
be several times the normal operating pressure and can seriously damage water
system components - ANSWER-water hammer
vent opening on atmospheric water storage should be ____ - ANSWER-Screened
the device used to check flow to customers is a ____ - ANSWER-Water meter
what is the prominent cause of a pinging sound coming from a water pump -
ANSWER-cavitation
the rotating component in a centrifugal pump is commonly called a - ANSWER-
impeller
water pressure in adistribution system should never drop below - ANSWER-20psi
a subsurface component of well installation includes - ANSWER-well casing
an aquifer - ANSWER-a water bearing stratum of rock sand or gravel
which of the following is a correct statement about chlorine gas - ANSWER-chlorine
gas is heavier than air
all occupied trenches 4 or more feet deep must provide exits at ___ - ANSWER-25
foot intervals
Grade 1 Study Guide With Complete
Solutions !!
After a new water mains is installed and pressure tested it should be - ANSWER-
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 - ANSWER-more
effective
water with a ph of 8.0 is considered - ANSWER-basic
what is a low voltage electrical system that is used to prevent rust corrosion and
pitting of metal surfaces in contact with water - ANSWER-cathodic protection
Which conventional treatment step is eliminated by direct filtration - ANSWER-
Sedimentation
A granular white powder used for disinfection - ANSWER-Calcium hypochlorite
What is the chlorine dose - ANSWER-Chlorine demand plus chlorine residual
what is a cross connection - ANSWER-an unprotected connection between a
drinking water supply and a system not approved as safe
what is an air gap separation device - ANSWER-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 -
ANSWER-the chlorine demand has been satisfied
what is the main difference between using hypochlorite compounds and chlorine gas
- ANSWER-the % of available chlorine
what is disenfection - ANSWER-process that kills or inactivates most microorganism
and pathogens
why is backflow a concern for water distribution systems - ANSWER-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 - ANSWER-cross connection contamination
, what contaminant causes methemoglobinemia - ANSWER-nitrate
what is the physical connection direct or indirect which provides the opportunity for
nonpotable water to enter a conduit pipe or receptacle containing potable water -
ANSWER-cross connection
what are two most important safety concerns when entering an confined space -
ANSWER-oxygen deficiency and hazardous gasses
what contaminant causes methemoglobinemia - ANSWER-nitrate
a public water supply uses chlorine for disinfection what is the point called when all
chlorine demand has been met and any further addition of chlorine results in a
proportional increase in free chlorine residual - ANSWER-breakpoint chlorination
which us agency establishes drinking water standards - ANSWER-USEPA
it is the duty of the water purveyor to deliver potable water of adequate quantity as
far as the: - ANSWER-customers tap
the safe drinking water act definition of a public water supply system is a water
system that has at least 15 service connections or serves at least 25 or more people
for at least ___ days per year - ANSWER-60 days
which of the following terms refers to excessive internal water pressure which may
be several times the normal operating pressure and can seriously damage water
system components - ANSWER-water hammer
vent opening on atmospheric water storage should be ____ - ANSWER-Screened
the device used to check flow to customers is a ____ - ANSWER-Water meter
what is the prominent cause of a pinging sound coming from a water pump -
ANSWER-cavitation
the rotating component in a centrifugal pump is commonly called a - ANSWER-
impeller
water pressure in adistribution system should never drop below - ANSWER-20psi
a subsurface component of well installation includes - ANSWER-well casing
an aquifer - ANSWER-a water bearing stratum of rock sand or gravel
which of the following is a correct statement about chlorine gas - ANSWER-chlorine
gas is heavier than air
all occupied trenches 4 or more feet deep must provide exits at ___ - ANSWER-25
foot intervals
