WATER DISTRIBUTION GRADE 1 Questions and Answers
What is the general definition of an ion? An _________ with a positive or negative
charge - answer Atom
A continuous positive pressure in a distribution system is essential for preventing what
event? - answer Backflow Event
_____________ water pressure must be maintained to ensure adequate customer
service during peak flow periods. However, minimum positive pressure must be
maintained in mains to protect against backflow or backsiphonage from
cross-connections. - answer Minimum
Name the most common CAUSE for public water supply contamination.
_________________ or cross-connection - answer Backflow
What does a backsiphonage condition usually cause? __________ pressure or
negative pressure on the service or supply side. - answer Reduced
What does a double check valve backflow assembly provide effective protection from?
Both backpressure and backsiphonage of ____________. - answer Pollution
What is equipment that utilizes water for cooling, lubrication, washing or as a solvent
always susceptible to? - answer Cross-Connection
What is the difference between a reduced pressure principle backflow device and a
double check backflow device? The RP has a ______________. - answer Relief Valve
What is the maximum time period between having a backflow device tested by a
certified backflow tester? ______________ year. - answer 1
What is the regulatory definition of a cross-connection in a water supply? A physical
connection between a public water system and any source of water or other substance
that may lead to contamination of the water provided by the _____________ through
backflow. - answer PWS
What is the name of a type of valve that reduces the differential pressure across a
closed disk making the main valve easier to open and close? - answer Bypass Valve
, As soon as Cl2 gas enters the throat area, a victim will sense a sudden stricture in this
area-Nature's way of signaling to prevent passage of the gas to the lungs. At this point,
the victim must attempt to do two things: get out of the area of the leak, proceeding
upwind, and to take only very short breaths through the mouth. Normal breathing will
cause __________, which must be prevented if possible. - answer Coughing
Chlorine gas causes suffocation, constriction of the chest, tightness in the throat, and
edema of the ______________. - answer Lungs
_______________ available chlorine is very effective in killing bacteria. - answer Free
How should an operator store an empty chlorine cylinder? ____________, tagged as
empty. - answer Upright
If a chlorine leak occurs, where will chlorine gas accumulate? Near the ____________
of the tank. - answer Bottom
What effect does chlorine gas have on the sense of smell? It produces olfactory
_______________. - answer Fatigue
What is the primary safety concern when using chlorine gas as opposed to calcium
hypochlorite or sodium hypochlorite? The potential for a _____________ leak. - answer
Gas
What may occur due to chronic exposure to low concentrations of chlorine gas? Chronic
exposure may cause corrosion of the _____________. - answer Teeth
What is the process called that changes water vapor to tiny droplets or ice crystals? -
answer Condensation
What is the unit of measurement for sound? - answer Decibels
What happens if grease comes in contact with the winding of a motor? - answer The
winding insulation my deteriorate.
What is the most common type of valve used in isolating a small or medium sized
section of a distribution system? - answer Gate
What is a possible result of over greasing a bearing? There is extreme _____________
in the bearing chamber causing heat and scoring of the shaft. - answer Friction
What is the general definition of an ion? An _________ with a positive or negative
charge - answer Atom
A continuous positive pressure in a distribution system is essential for preventing what
event? - answer Backflow Event
_____________ water pressure must be maintained to ensure adequate customer
service during peak flow periods. However, minimum positive pressure must be
maintained in mains to protect against backflow or backsiphonage from
cross-connections. - answer Minimum
Name the most common CAUSE for public water supply contamination.
_________________ or cross-connection - answer Backflow
What does a backsiphonage condition usually cause? __________ pressure or
negative pressure on the service or supply side. - answer Reduced
What does a double check valve backflow assembly provide effective protection from?
Both backpressure and backsiphonage of ____________. - answer Pollution
What is equipment that utilizes water for cooling, lubrication, washing or as a solvent
always susceptible to? - answer Cross-Connection
What is the difference between a reduced pressure principle backflow device and a
double check backflow device? The RP has a ______________. - answer Relief Valve
What is the maximum time period between having a backflow device tested by a
certified backflow tester? ______________ year. - answer 1
What is the regulatory definition of a cross-connection in a water supply? A physical
connection between a public water system and any source of water or other substance
that may lead to contamination of the water provided by the _____________ through
backflow. - answer PWS
What is the name of a type of valve that reduces the differential pressure across a
closed disk making the main valve easier to open and close? - answer Bypass Valve
, As soon as Cl2 gas enters the throat area, a victim will sense a sudden stricture in this
area-Nature's way of signaling to prevent passage of the gas to the lungs. At this point,
the victim must attempt to do two things: get out of the area of the leak, proceeding
upwind, and to take only very short breaths through the mouth. Normal breathing will
cause __________, which must be prevented if possible. - answer Coughing
Chlorine gas causes suffocation, constriction of the chest, tightness in the throat, and
edema of the ______________. - answer Lungs
_______________ available chlorine is very effective in killing bacteria. - answer Free
How should an operator store an empty chlorine cylinder? ____________, tagged as
empty. - answer Upright
If a chlorine leak occurs, where will chlorine gas accumulate? Near the ____________
of the tank. - answer Bottom
What effect does chlorine gas have on the sense of smell? It produces olfactory
_______________. - answer Fatigue
What is the primary safety concern when using chlorine gas as opposed to calcium
hypochlorite or sodium hypochlorite? The potential for a _____________ leak. - answer
Gas
What may occur due to chronic exposure to low concentrations of chlorine gas? Chronic
exposure may cause corrosion of the _____________. - answer Teeth
What is the process called that changes water vapor to tiny droplets or ice crystals? -
answer Condensation
What is the unit of measurement for sound? - answer Decibels
What happens if grease comes in contact with the winding of a motor? - answer The
winding insulation my deteriorate.
What is the most common type of valve used in isolating a small or medium sized
section of a distribution system? - answer Gate
What is a possible result of over greasing a bearing? There is extreme _____________
in the bearing chamber causing heat and scoring of the shaft. - answer Friction
