BACKFLOW WRITTEN EXAM
QUESTIONS AND ANSWERS
A water supplier may interrupt water service to a (user/ customer) when? - Correct
Answers -provisions in the cross connection control ordinance or regulations are not
met
Backflow in a public water supply can be caused by? - Correct Answers -backpressure
or backsiphonage
An atmospheric vacuum breaker may have a downstream shutoff valve? - Correct
Answers -under no circumstances
The 1996 Federal Safe Drinking Water Act places the primary responsibility for the
quality of the public water supply on which of the following? - Correct Answers -water
purveyor
An air gap must have? - Correct Answers -two times the pipe diameter with a minimum
of inch seperation
An unprotected by-pass around a reduced pressure principle backflow prevention
assembly is? - Correct Answers -not permissible
The major concerns of the water purveyor where an auxiliary water supply is utilized or
maintained is to ensure that? - Correct Answers -backflow protection is provided at the
water service connection
A pressure vacuum breaker may be installed with a (n)? - Correct Answers -shutoff
valve downstream
Two types of cross-connections are? - Correct Answers -direct and indirect
When non-toxic antifreeze chemicals are added to a fire suppressions system, which of
the following is required to protect the potable water supply? - Correct Answers -
reduced pressure principle backflow prevention assembly
Internal protection refers to? - Correct Answers -backflow protection at each point of use
, Lye is back siphoned from and open vat, without a cover over the top, by a direct cross-
connection. This constitutes a? - Correct Answers -health hazard
In responding to a suspected backflow incident, the water purveyor should? - Correct
Answers -implement emergency response plan
The loading of the first and second check valves in reduced pressure principle backflow
prevention assemblies are always? - Correct Answers -different
undersized water service and distribution piping carrying water at high velocity? -
Correct Answers -may cause backsiphonage due to aspirator effect
a perfect vacuum(at sea level) will raise water in a pipe a maximum of? - Correct
Answers -33.9 ft
the water supplier may require more frequent field testing of backflow prevention
assemblies due to? - Correct Answers -high incidence of field test failures of the
assembly
which testcock is the arrow pointing to? - Correct Answers -testcock 2
a differential pressure gage is used to field test? - Correct Answers -reduced pressure
principle backflow assemblies
the relief valve opening point of a reduced pressure principle backflow prevention
assembly must open at or above - Correct Answers -2.0 psid
when field testing a reduced pressure principle backflow prevention assembly, the
number two testcock should be flushed? - Correct Answers -with caution to prevent
premature opening of relief valve
during a field test, the air inlet valve on a pressure vacuum breaker must open at or? -
Correct Answers -above 1 psid
Hose Bibb Vacuum Breakers should be located? - Correct Answers -on hose bibbs as
required by code
the probable cause of an intermittent discharge of the relief valve on a reduced pressure
principle backflow prevention assembly is? - Correct Answers -fluctuation in supply line
pressure
When entering a vault containing a backflow prevention assembly, the tester should? -
Correct Answers -check quality of the atmosphere prior to entry
a service or containment protection backflow prevention assembly is meant to protect? -
Correct Answers -public water supply system
QUESTIONS AND ANSWERS
A water supplier may interrupt water service to a (user/ customer) when? - Correct
Answers -provisions in the cross connection control ordinance or regulations are not
met
Backflow in a public water supply can be caused by? - Correct Answers -backpressure
or backsiphonage
An atmospheric vacuum breaker may have a downstream shutoff valve? - Correct
Answers -under no circumstances
The 1996 Federal Safe Drinking Water Act places the primary responsibility for the
quality of the public water supply on which of the following? - Correct Answers -water
purveyor
An air gap must have? - Correct Answers -two times the pipe diameter with a minimum
of inch seperation
An unprotected by-pass around a reduced pressure principle backflow prevention
assembly is? - Correct Answers -not permissible
The major concerns of the water purveyor where an auxiliary water supply is utilized or
maintained is to ensure that? - Correct Answers -backflow protection is provided at the
water service connection
A pressure vacuum breaker may be installed with a (n)? - Correct Answers -shutoff
valve downstream
Two types of cross-connections are? - Correct Answers -direct and indirect
When non-toxic antifreeze chemicals are added to a fire suppressions system, which of
the following is required to protect the potable water supply? - Correct Answers -
reduced pressure principle backflow prevention assembly
Internal protection refers to? - Correct Answers -backflow protection at each point of use
, Lye is back siphoned from and open vat, without a cover over the top, by a direct cross-
connection. This constitutes a? - Correct Answers -health hazard
In responding to a suspected backflow incident, the water purveyor should? - Correct
Answers -implement emergency response plan
The loading of the first and second check valves in reduced pressure principle backflow
prevention assemblies are always? - Correct Answers -different
undersized water service and distribution piping carrying water at high velocity? -
Correct Answers -may cause backsiphonage due to aspirator effect
a perfect vacuum(at sea level) will raise water in a pipe a maximum of? - Correct
Answers -33.9 ft
the water supplier may require more frequent field testing of backflow prevention
assemblies due to? - Correct Answers -high incidence of field test failures of the
assembly
which testcock is the arrow pointing to? - Correct Answers -testcock 2
a differential pressure gage is used to field test? - Correct Answers -reduced pressure
principle backflow assemblies
the relief valve opening point of a reduced pressure principle backflow prevention
assembly must open at or above - Correct Answers -2.0 psid
when field testing a reduced pressure principle backflow prevention assembly, the
number two testcock should be flushed? - Correct Answers -with caution to prevent
premature opening of relief valve
during a field test, the air inlet valve on a pressure vacuum breaker must open at or? -
Correct Answers -above 1 psid
Hose Bibb Vacuum Breakers should be located? - Correct Answers -on hose bibbs as
required by code
the probable cause of an intermittent discharge of the relief valve on a reduced pressure
principle backflow prevention assembly is? - Correct Answers -fluctuation in supply line
pressure
When entering a vault containing a backflow prevention assembly, the tester should? -
Correct Answers -check quality of the atmosphere prior to entry
a service or containment protection backflow prevention assembly is meant to protect? -
Correct Answers -public water supply system
