WATER DISTRIBUTION EXAM 1 TEST WITH LATEST
UPDATED (QUESTIONS AND ANSWERS) ALREADY PASSED!
Back siphonage Correct Answers backflow due to negative or reduced
pressure in water system. occurs during low pressure events such as a
line leak
Reverse flow caused by a loss of supply pressure
Back Pressure Correct Answers Is caused when a potable water system
is connected to a non potable supply operating under a higher pressure
that pushes contaminated liquid back into the public water system
Back Pressure Correct Answers Occurs when the pressure of the
connected system exceeds the pressure of the drinking water system
Backflow Correct Answers Occurs when the pressure of the non-potable
system. Exceeds the positive pressure in the water distribution lines.
Diseases attributed to cross-connections: Correct Answers Dysentery•
Gastroenteritis• Hepatitis• Salmonellas
Direct Cross-Connection Correct Answers A direct cross-connection is
subject to backpressure or backsiphonage.
Undesirable material being pushed into the system.
,Indirect Cross-Connection Correct Answers Undesirable material being
pulled into the system.
An indirect cross-connection is subject to back-siphonage only.
Air Gap Correct Answers Air Gap: physical separation of the potable
and non-potable system by an air space.
The simplest, most reliable way to provide backflow prevention
Reduced Pressure (RP) Zone Backflow Preventer Correct Answers
Provides the greatest protection against backflow caused by back-
pressure and back-siphonage.
The RPZ should be used where continuous pressure or high hazard
conditions exist,
Reduced Pressure (RP) Zone Backflow Preventer Correct Answers Must
be tested annually and internal parts replaced every five years.
Pressure Vacuum Breakers (PVB) Correct Answers Must be used under
continuous pressure.
They must be installed at least 12 inches above the usage point to
prevent back-siphonage.
, Atmospheric Vacuum Breakers (AVB) Correct Answers Intended to
protect against back-siphonage but not back pressure. Check valve and
vent open to atmosphere.
Corrosion is the result? Correct Answers Corrosion is the result of an
electrochemical reaction
Lead and Copper Rule Correct Answers Protect public health by
minimizing the amount of lead and/or copper dissolving into tap water.
Anode (Galvanic Corrosion) Correct Answers where electrons are lost
through the metal.
Cathode.(Galvanic Corrosion) Correct Answers : where electrons are
gained and then leave the metal
Calcium Carbonate Correct Answers Water is considered stable when it
is just saturated with calcium carbonate.
Used for corrosion protection of pipe by a thin film of CaCo3 on the
interior of pipes.
Langelier Saturation Index (LSI) Correct Answers LSI values >zero
indicate scaling potential (i.e., precipitating).
The ideal range for balanced water is -0.3 to +0.3
UPDATED (QUESTIONS AND ANSWERS) ALREADY PASSED!
Back siphonage Correct Answers backflow due to negative or reduced
pressure in water system. occurs during low pressure events such as a
line leak
Reverse flow caused by a loss of supply pressure
Back Pressure Correct Answers Is caused when a potable water system
is connected to a non potable supply operating under a higher pressure
that pushes contaminated liquid back into the public water system
Back Pressure Correct Answers Occurs when the pressure of the
connected system exceeds the pressure of the drinking water system
Backflow Correct Answers Occurs when the pressure of the non-potable
system. Exceeds the positive pressure in the water distribution lines.
Diseases attributed to cross-connections: Correct Answers Dysentery•
Gastroenteritis• Hepatitis• Salmonellas
Direct Cross-Connection Correct Answers A direct cross-connection is
subject to backpressure or backsiphonage.
Undesirable material being pushed into the system.
,Indirect Cross-Connection Correct Answers Undesirable material being
pulled into the system.
An indirect cross-connection is subject to back-siphonage only.
Air Gap Correct Answers Air Gap: physical separation of the potable
and non-potable system by an air space.
The simplest, most reliable way to provide backflow prevention
Reduced Pressure (RP) Zone Backflow Preventer Correct Answers
Provides the greatest protection against backflow caused by back-
pressure and back-siphonage.
The RPZ should be used where continuous pressure or high hazard
conditions exist,
Reduced Pressure (RP) Zone Backflow Preventer Correct Answers Must
be tested annually and internal parts replaced every five years.
Pressure Vacuum Breakers (PVB) Correct Answers Must be used under
continuous pressure.
They must be installed at least 12 inches above the usage point to
prevent back-siphonage.
, Atmospheric Vacuum Breakers (AVB) Correct Answers Intended to
protect against back-siphonage but not back pressure. Check valve and
vent open to atmosphere.
Corrosion is the result? Correct Answers Corrosion is the result of an
electrochemical reaction
Lead and Copper Rule Correct Answers Protect public health by
minimizing the amount of lead and/or copper dissolving into tap water.
Anode (Galvanic Corrosion) Correct Answers where electrons are lost
through the metal.
Cathode.(Galvanic Corrosion) Correct Answers : where electrons are
gained and then leave the metal
Calcium Carbonate Correct Answers Water is considered stable when it
is just saturated with calcium carbonate.
Used for corrosion protection of pipe by a thin film of CaCo3 on the
interior of pipes.
Langelier Saturation Index (LSI) Correct Answers LSI values >zero
indicate scaling potential (i.e., precipitating).
The ideal range for balanced water is -0.3 to +0.3
