Backflow Prevention Practice Exam Latest 2026 Updated
Questions and Verified 100% Solutions (2026/2027) Grade:
A+|Status: Guaranteed Pass
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
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
1|Page
,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)
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
2|Page
,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
When a piping discharge is near a wall, the air-gap separation must be increased an additional
____ pipe diameter(s).
A. 1
B. 2
C. 3
D. 4
E. 5 - Answers -1
3|Page
, An air-gap separation's hazard classification is _____?
A. High hazard/backsiphonage
B. High hazard/backpressure
C. Low hazard/backsiphonage
D. Low hazard/backpressure
E. High or low hazard/backsiphonage only - Answers -High or low hazard/backsiphonage only
With the exception of a drinking fountain, the minimum air-gap separation is _____?
A. 0.5 in. (1.3 cm)
B. 1.0 in. (2.5 cm)
C. 1.5 in. (3.8 cm)
D. 2.0 in. (5.1 cm)
E. 3.0 in. (7.6 cm) - Answers -1.0 in. (2.5 cm)
Water discharged through an air gap to an open tank surface has a pressure of ____?
A. 0 psi absolute
B. 0 psi atmospheric
C. 0 psi gauge
D. Static line pressure
E. Vapor pressure - Answers -0 psi atmospheric
4|Page
Questions and Verified 100% Solutions (2026/2027) Grade:
A+|Status: Guaranteed Pass
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
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
1|Page
,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)
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
2|Page
,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
When a piping discharge is near a wall, the air-gap separation must be increased an additional
____ pipe diameter(s).
A. 1
B. 2
C. 3
D. 4
E. 5 - Answers -1
3|Page
, An air-gap separation's hazard classification is _____?
A. High hazard/backsiphonage
B. High hazard/backpressure
C. Low hazard/backsiphonage
D. Low hazard/backpressure
E. High or low hazard/backsiphonage only - Answers -High or low hazard/backsiphonage only
With the exception of a drinking fountain, the minimum air-gap separation is _____?
A. 0.5 in. (1.3 cm)
B. 1.0 in. (2.5 cm)
C. 1.5 in. (3.8 cm)
D. 2.0 in. (5.1 cm)
E. 3.0 in. (7.6 cm) - Answers -1.0 in. (2.5 cm)
Water discharged through an air gap to an open tank surface has a pressure of ____?
A. 0 psi absolute
B. 0 psi atmospheric
C. 0 psi gauge
D. Static line pressure
E. Vapor pressure - Answers -0 psi atmospheric
4|Page
