HUN1201 MIDTERM [CH
1,2,3,4,5,6,7,8,&15] (IRSC)
CERTIFICATION SCRIPT 2026
QUESTIONS WITH SOLUTIONS
GRADED A+
◍ What is the first value documented when testing a reduced pressure
principle backflow assembly?.
Answer: Relief valve opening point.
◍ What happens after opening the high side control needle valve one turn
during an RP test?.
Answer: The reading on the field test kit should decrease and the relief valve
should discharge water
◍ Spill-resistant vacuum breakers protect against contaminants during
continuous use under backsiphonage conditions..
Answer: True
◍ When testing the #2 check valve of a DC water keeps flowing from the #4
test cock. After opening the bleed off valve the water stops flowing. This
indicates:.
Answer: #1 check valve is leaking
◍ The check valves in a double check valve backflow assembly are designed
to hold at a minimum of:.
Answer: 2 psi
◍ Which of the following is not allowed during a backflow assembly repair?.
Answer: Modifying the internal components
,◍ What are two types of backflow conditions?.
Answer: Backpressure and backsiphonage
◍ An auxiliary water supply (with unknown water quality) is used to
supplement pressure to a fire sprinkler system in a commercial building.
Which of the following is the appropriate backflow protection?.
Answer: Reduced pressure principle
◍ Cross connection control.
Answer: The use of assemblies methods and procedures to prevent
contamination of a potable water supply through cross connections
◍ On a double check (DC), the #2 test cock is located where?.
Answer: Between the #1 check valve and the #2 check valve
◍ What should the tester do if they observe the gauge drop to the low end of
the scale and water discharges from the relief when setting up the reduced
pressure assembly for testing?.
Answer: Stop the test and fail the assembly
◍ Pressure vacuum breaker (PVB).
Answer: A backflow prevention assembly consisting of one independently
operating spring loaded, check valve and and independently operating
spring, loaded air inlet valve located in the discharge side of the check
valve, with properly loaded test costs, and tightly closing shut off valve on
each side of the check valves. A PVB Is testable and protects against
siphonage only not back pressure
◍ If during the testing of a reduced pressure principle backflow assembly, the
gauge will not drop to the relief valve opening point, what is most likely the
case?.
Answer: #1 check valve is fouled
◍ Refusal of service.
Answer: A formal policy adopted by a governing board to enable a utility to
refuse or discontinue service where a known hazard exist and corrective
, measures are not undertaken
◍ During a field test of the pressure vacuum breaker, which component is
tested first?.
Answer: Air inlet valve
◍ What does plumbing code govern?.
Answer: The potable water system
◍ Installing a ____ on the water supply line would create a closed system..
Answer: Backflow Assembly
◍ What should be done before testing a reduced pressure assembly?.
Answer: Perform preliminary steps prior to testing
◍ Do double checks (DC) protect the potable water supply from every
hazard?.
Answer: False
◍ Pollutant.
Answer: A substance that would constitute A non-health hazard and would
be aesthetically objectionable if introduce into the potable water supply
system
◍ Atmospheric vacuum breakers cannot be used to protect against:.
Answer: Backpressure
◍ What is pressure defined as?.
Answer: Force exerted over a unit area.
◍ What is indicated by a gauge drop during the testing of a reduced pressure
assembly?.
Answer: Potential leaks in the assembly
◍ What must the differential pressure across the #1 check valve on an RP be
higher than?.
Answer: The relief valve opening point
◍ Which backflow assembly cannot protect against contaminants at all?.
1,2,3,4,5,6,7,8,&15] (IRSC)
CERTIFICATION SCRIPT 2026
QUESTIONS WITH SOLUTIONS
GRADED A+
◍ What is the first value documented when testing a reduced pressure
principle backflow assembly?.
Answer: Relief valve opening point.
◍ What happens after opening the high side control needle valve one turn
during an RP test?.
Answer: The reading on the field test kit should decrease and the relief valve
should discharge water
◍ Spill-resistant vacuum breakers protect against contaminants during
continuous use under backsiphonage conditions..
Answer: True
◍ When testing the #2 check valve of a DC water keeps flowing from the #4
test cock. After opening the bleed off valve the water stops flowing. This
indicates:.
Answer: #1 check valve is leaking
◍ The check valves in a double check valve backflow assembly are designed
to hold at a minimum of:.
Answer: 2 psi
◍ Which of the following is not allowed during a backflow assembly repair?.
Answer: Modifying the internal components
,◍ What are two types of backflow conditions?.
Answer: Backpressure and backsiphonage
◍ An auxiliary water supply (with unknown water quality) is used to
supplement pressure to a fire sprinkler system in a commercial building.
Which of the following is the appropriate backflow protection?.
Answer: Reduced pressure principle
◍ Cross connection control.
Answer: The use of assemblies methods and procedures to prevent
contamination of a potable water supply through cross connections
◍ On a double check (DC), the #2 test cock is located where?.
Answer: Between the #1 check valve and the #2 check valve
◍ What should the tester do if they observe the gauge drop to the low end of
the scale and water discharges from the relief when setting up the reduced
pressure assembly for testing?.
Answer: Stop the test and fail the assembly
◍ Pressure vacuum breaker (PVB).
Answer: A backflow prevention assembly consisting of one independently
operating spring loaded, check valve and and independently operating
spring, loaded air inlet valve located in the discharge side of the check
valve, with properly loaded test costs, and tightly closing shut off valve on
each side of the check valves. A PVB Is testable and protects against
siphonage only not back pressure
◍ If during the testing of a reduced pressure principle backflow assembly, the
gauge will not drop to the relief valve opening point, what is most likely the
case?.
Answer: #1 check valve is fouled
◍ Refusal of service.
Answer: A formal policy adopted by a governing board to enable a utility to
refuse or discontinue service where a known hazard exist and corrective
, measures are not undertaken
◍ During a field test of the pressure vacuum breaker, which component is
tested first?.
Answer: Air inlet valve
◍ What does plumbing code govern?.
Answer: The potable water system
◍ Installing a ____ on the water supply line would create a closed system..
Answer: Backflow Assembly
◍ What should be done before testing a reduced pressure assembly?.
Answer: Perform preliminary steps prior to testing
◍ Do double checks (DC) protect the potable water supply from every
hazard?.
Answer: False
◍ Pollutant.
Answer: A substance that would constitute A non-health hazard and would
be aesthetically objectionable if introduce into the potable water supply
system
◍ Atmospheric vacuum breakers cannot be used to protect against:.
Answer: Backpressure
◍ What is pressure defined as?.
Answer: Force exerted over a unit area.
◍ What is indicated by a gauge drop during the testing of a reduced pressure
assembly?.
Answer: Potential leaks in the assembly
◍ What must the differential pressure across the #1 check valve on an RP be
higher than?.
Answer: The relief valve opening point
◍ Which backflow assembly cannot protect against contaminants at all?.
