Backflow Prevention Final
1. Backflow is defined as:
a) the pressure in the distribution piping of the potable water supply
b) the undesirable reversal of water, other liquids, gases or substances in the
distribution pipes of the potable water supply
c) high pressure in the pipes of the water user
d) excess pressure through a pressure regulator - ANS-b) the undesirable reversal of
water, other liquids, gases or substances in the distribution pipes of the potable water
supply
2. Primary responsibility for cross connection control is vested in
a) the water purveyor
b) the water site supervisor
c) the health department
d) the State Health department - ANS-a) the water purveyor
3. A reduced pressure principle backflow prevention assembly is comprised of:
a) two independently operating air inlet valves with a hydraulically operating
mechanically independent differential relief valve
b) two check valves, two shut off valves and an air relief valve
c) two independently acting approved check valves, a hydraulically operated differential
pressure relief valve, with four appropriately located resilient seated test cocks and two
resilient seated shut off valves
d) two independently operated approved check valves, mechanically operated air relief
valve, four resilient seated test cocks between two resilient seated shut off valves -
ANS-c) two independently acting approved check valves, a hydraulically operated
differential pressure relief valve, with four appropriately located resilient seated test
cocks and two resilient seated shut off valves
4. A local ordinance establishing a cross connection control program must require that:
a) the property owner test the assembly periodically
b) a certified tester test the assembly at least once every twelve months and report the
test results to the water purveyor it a timely manner
c) the water purveyor will install the necessary cross connection control assembly
d) pressure vacuum breaker will be installed at all service connections - ANS-b) a
certified tester test the assembly at least once every twelve months and report the test
results to the water purveyor it a timely manner
,5. The definition of an approved air gap used for backflow prevention shall be:
a) be equipped with a splash guard and a receiving funnel
b) be not less than one inch from the side wall of the receiving vessel
c) be a vertical dimension of at least twice the diameter of the supply pipe but not less
than one inch above the receiving vessel
d) be less that one inch above the flood rim of the receiving vessel - ANS-c) be a
vertical dimension of at least twice the diameter of the supply pipe but not less than one
inch above the receiving vessel
6. The correct installation of a reduced pressure principle backflow prevention assembly
is:
a) it doesn't matter where the assembly is placed
b) in a pit behind the water meter
c) in a vented vault below the floodplain
d) in an above grade, protected and accessible site - ANS-d) in an above grade,
protected and accessible site
7. If water is continuously flowing from the relief valve port of a reduced pressure
principle backflow prevention assembly the tester may report:
a) the relief valve is stuck closed
b) the first check may be fouled, or the differential pressure relief valve may have
malfunctioned, or the second check is fouled with backpressure on the assembly
c) the distribution line is subject to pressure surges
d) the number two check valve has failed - ANS-b) the first check may be fouled, or the
differential pressure relief valve may have malfunctioned, or the second check is fouled
with backpressure on the assembly
8. Backpressure will cause backflow:
a) through an unprotected over the rim feed to an open make-up water tank
b) through an unprotected over the rim gravity feed line to an open wash tank
c) through an unprotected feed to a closed make-up water tank
d) through an unprotected feed to a cattle watering trough - ANS-c) through an
unprotected feed to a closed make-up water tank
9. In testing a reduced pressure principle backflow prevention assembly:
a) the relief valve must be tested first
b) the apparent drop across the first check valve must be tested first
c) the second check must be tested first
d) the flow rate must be tested first - ANS-a) the relief valve must be tested first
, 10. A water purveyor or public health agency may require more frequent testing of a
backflow prevention assembly than the maximum time allowed between testing. What is
the maximum legal length of time permitted between tests:
a) six months
b) eighteen months
c) twelve weeks
d) twelve months - ANS-d) twelve months
11. Which of the following types of cross connections are considered to be illegal?
a) a by-pass hose with a shut off valve installed around a reduced pressure principle
backflow prevention assembly
b) a supply line to a boiler from a domestic service equipped with a reduced pressure
principle backflow prevention assembly
c) a service to a single family residence
d) an air gapped service to a high rise building - ANS-a) a by-pass hose with a shut off
valve installed around a reduced pressure principle backflow prevention assembly
12. Backsiphonage due to an aspirator effect maybe caused by:
a) a sudden increase of the water supply
b) high velocity flow of water through a tee in a piping system
c) water from a high pressure pump against the number two check valve of an approved
double check valve assembly
d) a hose equipped with an anti-siphon valve at the hose bib being dropped into an
open tank - ANS-b) high velocity flow of water through a tee in a piping system
13. When installed correctly pressure vacuum breakers shall be:
a) 12" above the highest point of piping and usage
b) have no shut off valves downstream
c) have no backpressure on the assembly
d) a and b above
e) a and c above - ANS-e) a and c above
(a) 12" above the highest point of piping and usage
(c) have no backpressure on the assembly
14. Which of the following is the backflow protection found on a kitchen faucet in a
residential installation?
a) duplex check valve
b) air gap
c) pressure reducing valve
1. Backflow is defined as:
a) the pressure in the distribution piping of the potable water supply
b) the undesirable reversal of water, other liquids, gases or substances in the
distribution pipes of the potable water supply
c) high pressure in the pipes of the water user
d) excess pressure through a pressure regulator - ANS-b) the undesirable reversal of
water, other liquids, gases or substances in the distribution pipes of the potable water
supply
2. Primary responsibility for cross connection control is vested in
a) the water purveyor
b) the water site supervisor
c) the health department
d) the State Health department - ANS-a) the water purveyor
3. A reduced pressure principle backflow prevention assembly is comprised of:
a) two independently operating air inlet valves with a hydraulically operating
mechanically independent differential relief valve
b) two check valves, two shut off valves and an air relief valve
c) two independently acting approved check valves, a hydraulically operated differential
pressure relief valve, with four appropriately located resilient seated test cocks and two
resilient seated shut off valves
d) two independently operated approved check valves, mechanically operated air relief
valve, four resilient seated test cocks between two resilient seated shut off valves -
ANS-c) two independently acting approved check valves, a hydraulically operated
differential pressure relief valve, with four appropriately located resilient seated test
cocks and two resilient seated shut off valves
4. A local ordinance establishing a cross connection control program must require that:
a) the property owner test the assembly periodically
b) a certified tester test the assembly at least once every twelve months and report the
test results to the water purveyor it a timely manner
c) the water purveyor will install the necessary cross connection control assembly
d) pressure vacuum breaker will be installed at all service connections - ANS-b) a
certified tester test the assembly at least once every twelve months and report the test
results to the water purveyor it a timely manner
,5. The definition of an approved air gap used for backflow prevention shall be:
a) be equipped with a splash guard and a receiving funnel
b) be not less than one inch from the side wall of the receiving vessel
c) be a vertical dimension of at least twice the diameter of the supply pipe but not less
than one inch above the receiving vessel
d) be less that one inch above the flood rim of the receiving vessel - ANS-c) be a
vertical dimension of at least twice the diameter of the supply pipe but not less than one
inch above the receiving vessel
6. The correct installation of a reduced pressure principle backflow prevention assembly
is:
a) it doesn't matter where the assembly is placed
b) in a pit behind the water meter
c) in a vented vault below the floodplain
d) in an above grade, protected and accessible site - ANS-d) in an above grade,
protected and accessible site
7. If water is continuously flowing from the relief valve port of a reduced pressure
principle backflow prevention assembly the tester may report:
a) the relief valve is stuck closed
b) the first check may be fouled, or the differential pressure relief valve may have
malfunctioned, or the second check is fouled with backpressure on the assembly
c) the distribution line is subject to pressure surges
d) the number two check valve has failed - ANS-b) the first check may be fouled, or the
differential pressure relief valve may have malfunctioned, or the second check is fouled
with backpressure on the assembly
8. Backpressure will cause backflow:
a) through an unprotected over the rim feed to an open make-up water tank
b) through an unprotected over the rim gravity feed line to an open wash tank
c) through an unprotected feed to a closed make-up water tank
d) through an unprotected feed to a cattle watering trough - ANS-c) through an
unprotected feed to a closed make-up water tank
9. In testing a reduced pressure principle backflow prevention assembly:
a) the relief valve must be tested first
b) the apparent drop across the first check valve must be tested first
c) the second check must be tested first
d) the flow rate must be tested first - ANS-a) the relief valve must be tested first
, 10. A water purveyor or public health agency may require more frequent testing of a
backflow prevention assembly than the maximum time allowed between testing. What is
the maximum legal length of time permitted between tests:
a) six months
b) eighteen months
c) twelve weeks
d) twelve months - ANS-d) twelve months
11. Which of the following types of cross connections are considered to be illegal?
a) a by-pass hose with a shut off valve installed around a reduced pressure principle
backflow prevention assembly
b) a supply line to a boiler from a domestic service equipped with a reduced pressure
principle backflow prevention assembly
c) a service to a single family residence
d) an air gapped service to a high rise building - ANS-a) a by-pass hose with a shut off
valve installed around a reduced pressure principle backflow prevention assembly
12. Backsiphonage due to an aspirator effect maybe caused by:
a) a sudden increase of the water supply
b) high velocity flow of water through a tee in a piping system
c) water from a high pressure pump against the number two check valve of an approved
double check valve assembly
d) a hose equipped with an anti-siphon valve at the hose bib being dropped into an
open tank - ANS-b) high velocity flow of water through a tee in a piping system
13. When installed correctly pressure vacuum breakers shall be:
a) 12" above the highest point of piping and usage
b) have no shut off valves downstream
c) have no backpressure on the assembly
d) a and b above
e) a and c above - ANS-e) a and c above
(a) 12" above the highest point of piping and usage
(c) have no backpressure on the assembly
14. Which of the following is the backflow protection found on a kitchen faucet in a
residential installation?
a) duplex check valve
b) air gap
c) pressure reducing valve
