Maryland Backflow Prevention Tester
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
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1. A certified backflow prevention tester is performing an inspection on a
reduced pressure zone (RPZ) assembly and observes continuous
discharge from the relief valve under normal operating pressure; what
is the most likely cause of this condition?
A. Check valve #2 is leaking
B. Relief valve opening pressure is set too high
C. Check valve #1 is fouled or leaking
D. Shutoff valve #2 is closed
Answer: C
Rationale: Continuous discharge from the relief valve in an RPZ
, assembly under normal pressure typically indicates that check valve
#1 is not holding properly, allowing pressure to drop in the zone and
triggering the relief valve to open.
2. During testing of a double check valve assembly (DCVA), the tester
notes that both check valves are holding but there is minor leakage
through shutoff valve #1; what is the implication of this finding?
A. The assembly has passed and requires no action
B. The assembly has failed and must be replaced
C. The shutoff valve must be repaired or replaced
D. The test results are invalid due to leakage
Answer: C
Rationale: Shutoff valves must be tight for proper isolation during
testing; leakage indicates the need for repair or replacement,
although it may not necessarily fail the assembly itself.
3. Which of the following conditions defines backpressure backflow in a
potable water system?
A. Downstream pressure exceeds upstream supply pressure
B. A vacuum condition is created in the supply line
C. Water flows only due to gravity
D. Pressure remains constant across the system
Answer: A
Rationale: Backpressure backflow occurs when the downstream
, pressure becomes greater than the upstream supply pressure, forcing
water to reverse direction.
4. A tester uses a differential pressure gauge to test an RPZ assembly and
finds that check valve #1 has a pressure differential of 4.5 psi; what
does this indicate?
A. The valve has failed
B. The valve is functioning properly
C. The relief valve must be replaced
D. The gauge is defective
Answer: B
Rationale: A pressure differential of 4.5 psi exceeds the minimum
required 5 psi for many standards, but generally indicates acceptable
performance depending on jurisdiction; it suggests the valve is
holding adequately.
5. What is the primary purpose of a backflow prevention assembly?
A. Increase water pressure
B. Prevent contamination of potable water
C. Store water for emergencies
D. Reduce water temperature
Answer: B
Rationale: Backflow prevention assemblies are designed to protect
potable water supplies from contamination due to reverse flow
conditions.
, 6. When testing a pressure vacuum breaker (PVB), what is the minimum
required air inlet valve opening point?
A. 0.5 psi
B. 1.0 psi
C. 2.0 psi
D. 5.0 psi
Answer: B
Rationale: The air inlet valve in a PVB must open at or above 1.0 psi
to ensure proper protection against back siphonage.
7. Which assembly is most appropriate for high hazard conditions
involving potential health risks?
A. Double check valve assembly
B. Pressure vacuum breaker
C. Reduced pressure zone assembly
D. Atmospheric vacuum breaker
Answer: C
Rationale: RPZ assemblies provide the highest level of protection and
are used in high hazard situations where contaminants pose a health
risk.
8. What component of an RPZ assembly discharges water when a failure
occurs?
A. Check valve #2
B. Relief valve
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. A certified backflow prevention tester is performing an inspection on a
reduced pressure zone (RPZ) assembly and observes continuous
discharge from the relief valve under normal operating pressure; what
is the most likely cause of this condition?
A. Check valve #2 is leaking
B. Relief valve opening pressure is set too high
C. Check valve #1 is fouled or leaking
D. Shutoff valve #2 is closed
Answer: C
Rationale: Continuous discharge from the relief valve in an RPZ
, assembly under normal pressure typically indicates that check valve
#1 is not holding properly, allowing pressure to drop in the zone and
triggering the relief valve to open.
2. During testing of a double check valve assembly (DCVA), the tester
notes that both check valves are holding but there is minor leakage
through shutoff valve #1; what is the implication of this finding?
A. The assembly has passed and requires no action
B. The assembly has failed and must be replaced
C. The shutoff valve must be repaired or replaced
D. The test results are invalid due to leakage
Answer: C
Rationale: Shutoff valves must be tight for proper isolation during
testing; leakage indicates the need for repair or replacement,
although it may not necessarily fail the assembly itself.
3. Which of the following conditions defines backpressure backflow in a
potable water system?
A. Downstream pressure exceeds upstream supply pressure
B. A vacuum condition is created in the supply line
C. Water flows only due to gravity
D. Pressure remains constant across the system
Answer: A
Rationale: Backpressure backflow occurs when the downstream
, pressure becomes greater than the upstream supply pressure, forcing
water to reverse direction.
4. A tester uses a differential pressure gauge to test an RPZ assembly and
finds that check valve #1 has a pressure differential of 4.5 psi; what
does this indicate?
A. The valve has failed
B. The valve is functioning properly
C. The relief valve must be replaced
D. The gauge is defective
Answer: B
Rationale: A pressure differential of 4.5 psi exceeds the minimum
required 5 psi for many standards, but generally indicates acceptable
performance depending on jurisdiction; it suggests the valve is
holding adequately.
5. What is the primary purpose of a backflow prevention assembly?
A. Increase water pressure
B. Prevent contamination of potable water
C. Store water for emergencies
D. Reduce water temperature
Answer: B
Rationale: Backflow prevention assemblies are designed to protect
potable water supplies from contamination due to reverse flow
conditions.
, 6. When testing a pressure vacuum breaker (PVB), what is the minimum
required air inlet valve opening point?
A. 0.5 psi
B. 1.0 psi
C. 2.0 psi
D. 5.0 psi
Answer: B
Rationale: The air inlet valve in a PVB must open at or above 1.0 psi
to ensure proper protection against back siphonage.
7. Which assembly is most appropriate for high hazard conditions
involving potential health risks?
A. Double check valve assembly
B. Pressure vacuum breaker
C. Reduced pressure zone assembly
D. Atmospheric vacuum breaker
Answer: C
Rationale: RPZ assemblies provide the highest level of protection and
are used in high hazard situations where contaminants pose a health
risk.
8. What component of an RPZ assembly discharges water when a failure
occurs?
A. Check valve #2
B. Relief valve
