Backflow Prevention Practice Exam Study Guide Latest 2026
Updated Questions and Verified 100% Solutions (2026/2027)
Grade: A+|Status: Guaranteed Pass
A reduced pressure principle assembly's relief valve is loaded to _____?
A. Push the valve away from its seat
B. Push the valve on to its seat
C. Remain closed with any zone pressure
D. Remain open with any supply pressure
E. Sustain all water hammer conditions - Answers -Push the valve away from its seat
The purpose of the reduced pressure principle assembly check valve number 1 loading is to
_____?
A. Create a pressure head increase
B. Create a reduction in water pressure
C. Provide water pressure to the relief valve diaphragm
D. Reduce system pressure to the plumbing code limit
E. Sustain the assembly's buffer - Answers -Create a reduction in water pressure
Intermittent relief valve discharge from a reduced pressure principle assembly is probably
caused by _____?
A. A fouled check valve number 1
B. A fouled check valve number 2
C. A fouled relief valve
D. A partially closed shut-off valve number 2
1|Page
,E. Water hammer or hydraulic shock - Answers -Water hammer or hydraulic shock
Backpressure to a reduced pressure principle assembly fouled check valve number 2 will likely
_____?
A. Dissipate through the air-vent
B. Force the relief valve to open and discharge
C. Have no visible effect
D. Push the check valve closed
E. Remain in the system - Answers -Force the relief valve to open and discharge
An air-gap separation must be maintained at a reduced pressure principle assembly's _____?
A. Build drain
B. Domestic Supply
C. Indirect drain outlet
D. Relief valve discharge
E. Stationary sensor - Answers -Relief valve discharge
A reduced pressure principle assembly's buffer can be described as a ____?
A. Soft-seated check upstream of the assembly
B. Difference between the values for check valve 1 and check valve 2
C. Difference between the check valve 1 loading and the relief valve opening point
D. Difference between the relief valve opening point and check valve 2
E. Sum of the check valve 1 loading and the relief valve divided by 2 - Answers -Difference
between the check valve 1 loading and the relief valve opening point
2|Page
,When a reduced pressure principle assembly is installed vertically, the relief valve discharge
must be _____?
A. To a floor drain 2 times the piping size
B. Higher than check valve number 1
C. Lower than check valve number 1
D. Lower than check valve number 2
E. Piped with the flow directed down - Answers -Lower than check valve number 1
The maximum protection provided by a reduced pressure principle assembly is ____?
A. High hazard/backpressure
B. High hazard/backsiphonage
C. High hazard/backpressure or backsiphonage
D. Low hazard/backpressure
E. Low hazard/backpressure or backsiphonage - Answers -High hazard/backpressure or
backsiphonage
The reduced pressure principle assembly's number 2 check valve is loaded to close the valve
with a minimum differential pressure of _____?
A. 1 psid (6.9 kPa)
B. 2 psid (13.9 kPa)
C. 3 psid (20.7 kPa)
D. 4 psid (27.6 kPa)
E. 5 psid (34.5 kPa) - Answers -1 psid (6.9 kPa)
3|Page
, If a reduced pressure principle assembly's field test shows a leaking shut-off valve 2, the leak
may be compensated by obtaining water pressure/flow from ____?
A. A high-pressure gauge control valve
B. A low-pressure gauge control valve
C. Test cock number 1
D. Test cock number 2
E. Test cock number 3 - Answers -Test cock number 1
An air-gap separation will tend to _____?
A. Admit air into the system to break a siphon
B. Allow air to backpressure instead of liquid
C. Dissipate chlorine residual
D. Generate a whistle to warn of a siphon
E. Provide code compliance - Answers -Admit air into the system to break a siphon
Technically, the air-gap separation dimension is determined from the ____?
A. Discharge pipe's outer diameter
B. Effective opening
C. Fixture inlet diameter
D. Supply pipe diameter
E. Service connection size - Answers -Effective opening
4|Page
Updated Questions and Verified 100% Solutions (2026/2027)
Grade: A+|Status: Guaranteed Pass
A reduced pressure principle assembly's relief valve is loaded to _____?
A. Push the valve away from its seat
B. Push the valve on to its seat
C. Remain closed with any zone pressure
D. Remain open with any supply pressure
E. Sustain all water hammer conditions - Answers -Push the valve away from its seat
The purpose of the reduced pressure principle assembly check valve number 1 loading is to
_____?
A. Create a pressure head increase
B. Create a reduction in water pressure
C. Provide water pressure to the relief valve diaphragm
D. Reduce system pressure to the plumbing code limit
E. Sustain the assembly's buffer - Answers -Create a reduction in water pressure
Intermittent relief valve discharge from a reduced pressure principle assembly is probably
caused by _____?
A. A fouled check valve number 1
B. A fouled check valve number 2
C. A fouled relief valve
D. A partially closed shut-off valve number 2
1|Page
,E. Water hammer or hydraulic shock - Answers -Water hammer or hydraulic shock
Backpressure to a reduced pressure principle assembly fouled check valve number 2 will likely
_____?
A. Dissipate through the air-vent
B. Force the relief valve to open and discharge
C. Have no visible effect
D. Push the check valve closed
E. Remain in the system - Answers -Force the relief valve to open and discharge
An air-gap separation must be maintained at a reduced pressure principle assembly's _____?
A. Build drain
B. Domestic Supply
C. Indirect drain outlet
D. Relief valve discharge
E. Stationary sensor - Answers -Relief valve discharge
A reduced pressure principle assembly's buffer can be described as a ____?
A. Soft-seated check upstream of the assembly
B. Difference between the values for check valve 1 and check valve 2
C. Difference between the check valve 1 loading and the relief valve opening point
D. Difference between the relief valve opening point and check valve 2
E. Sum of the check valve 1 loading and the relief valve divided by 2 - Answers -Difference
between the check valve 1 loading and the relief valve opening point
2|Page
,When a reduced pressure principle assembly is installed vertically, the relief valve discharge
must be _____?
A. To a floor drain 2 times the piping size
B. Higher than check valve number 1
C. Lower than check valve number 1
D. Lower than check valve number 2
E. Piped with the flow directed down - Answers -Lower than check valve number 1
The maximum protection provided by a reduced pressure principle assembly is ____?
A. High hazard/backpressure
B. High hazard/backsiphonage
C. High hazard/backpressure or backsiphonage
D. Low hazard/backpressure
E. Low hazard/backpressure or backsiphonage - Answers -High hazard/backpressure or
backsiphonage
The reduced pressure principle assembly's number 2 check valve is loaded to close the valve
with a minimum differential pressure of _____?
A. 1 psid (6.9 kPa)
B. 2 psid (13.9 kPa)
C. 3 psid (20.7 kPa)
D. 4 psid (27.6 kPa)
E. 5 psid (34.5 kPa) - Answers -1 psid (6.9 kPa)
3|Page
, If a reduced pressure principle assembly's field test shows a leaking shut-off valve 2, the leak
may be compensated by obtaining water pressure/flow from ____?
A. A high-pressure gauge control valve
B. A low-pressure gauge control valve
C. Test cock number 1
D. Test cock number 2
E. Test cock number 3 - Answers -Test cock number 1
An air-gap separation will tend to _____?
A. Admit air into the system to break a siphon
B. Allow air to backpressure instead of liquid
C. Dissipate chlorine residual
D. Generate a whistle to warn of a siphon
E. Provide code compliance - Answers -Admit air into the system to break a siphon
Technically, the air-gap separation dimension is determined from the ____?
A. Discharge pipe's outer diameter
B. Effective opening
C. Fixture inlet diameter
D. Supply pipe diameter
E. Service connection size - Answers -Effective opening
4|Page
