Massachusetts Water Distribution Grade
1 Exam Questions and Answers Best
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Update
What is the general definition of an ion? An _________ with a positive or negative
charge -CORRECTANSWER Atom
A continuous positive pressure in a distribution system is essential for preventing what
event? -CORRECTANSWER 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. -CORRECTANSWER Minimum
Name the most common CAUSE for public water supply contamination.
_________________ or cross-connection -CORRECTANSWER Backflow
What does a backsiphonage condition usually cause? __________ pressure or
negative pressure on the service or supply side. -CORRECTANSWER Reduced
,What does a double check valve backflow assembly provide effective protection from?
Both backpressure and backsiphonage of ____________. -CORRECTANSWER
Pollution
What is equipment that utilizes water for cooling, lubrication, washing or as a solvent
always susceptible to? -CORRECTANSWER Cross-Connection
What is the difference between a reduced pressure principle backflow device and a
double check backflow device? The RP has a ______________. -CORRECTANSWER
Relief Valve
What is the maximum time period between having a backflow device tested by a
certified backflow tester? ______________ year. -CORRECTANSWER 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. -CORRECTANSWER 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? -CORRECTANSWER
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. -CORRECTANSWER
Coughing
Chlorine gas causes suffocation, constriction of the chest, tightness in the throat, and
edema of the ______________. -CORRECTANSWER Lungs
_______________ available chlorine is very effective in killing bacteria. -
CORRECTANSWER Free
How should an operator store an empty chlorine cylinder? ____________, tagged as
empty. -CORRECTANSWER Upright
If a chlorine leak occurs, where will chlorine gas accumulate? Near the ____________
of the tank. -CORRECTANSWER Bottom
What effect does chlorine gas have on the sense of smell? It produces olfactory
_______________. -CORRECTANSWER Fatigue
1 Exam Questions and Answers Best
rated A+ Guaranteed Success Latest
Update
What is the general definition of an ion? An _________ with a positive or negative
charge -CORRECTANSWER Atom
A continuous positive pressure in a distribution system is essential for preventing what
event? -CORRECTANSWER 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. -CORRECTANSWER Minimum
Name the most common CAUSE for public water supply contamination.
_________________ or cross-connection -CORRECTANSWER Backflow
What does a backsiphonage condition usually cause? __________ pressure or
negative pressure on the service or supply side. -CORRECTANSWER Reduced
,What does a double check valve backflow assembly provide effective protection from?
Both backpressure and backsiphonage of ____________. -CORRECTANSWER
Pollution
What is equipment that utilizes water for cooling, lubrication, washing or as a solvent
always susceptible to? -CORRECTANSWER Cross-Connection
What is the difference between a reduced pressure principle backflow device and a
double check backflow device? The RP has a ______________. -CORRECTANSWER
Relief Valve
What is the maximum time period between having a backflow device tested by a
certified backflow tester? ______________ year. -CORRECTANSWER 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. -CORRECTANSWER 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? -CORRECTANSWER
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. -CORRECTANSWER
Coughing
Chlorine gas causes suffocation, constriction of the chest, tightness in the throat, and
edema of the ______________. -CORRECTANSWER Lungs
_______________ available chlorine is very effective in killing bacteria. -
CORRECTANSWER Free
How should an operator store an empty chlorine cylinder? ____________, tagged as
empty. -CORRECTANSWER Upright
If a chlorine leak occurs, where will chlorine gas accumulate? Near the ____________
of the tank. -CORRECTANSWER Bottom
What effect does chlorine gas have on the sense of smell? It produces olfactory
_______________. -CORRECTANSWER Fatigue
