Tester Exam Practice Questions And

ASSE 5110 Backflow Prevention Assembly Tester Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the main purpose of a backflow prevention assembly?
• To improve water pressure
• To prevent water leaks
• To prevent contamination of potable water
• To reduce flow turbulence

Backflow prevention assemblies protect the potable water system from contamination or pollution caused by reverse flow of non-potable substances.

2. Backflow is defined as:

• Flow in the normal direction
• Flow of water or other substances in the opposite direction from its 1 / 4

intended path

• A reduction in pressure downstream
• The forward flow through a valve

Backflow occurs when the direction of flow reverses, potentially introducing contaminants into potable systems.

3. Backpressure backflow occurs when:

• Supply pressure increases
• Supply pressure decreases
• Downstream pressure exceeds supply pressure
• There is no pressure differential

When downstream pressure becomes greater than the supply pressure, fluids can be forced back into the potable system.

4. Back-siphonage backflow is caused by:

• Increased downstream pressure
• A drop in supply pressure below atmospheric
• Pump failure
• Air entrapment

Back-siphonage happens when supply pressure drops, creating a vacuum that draws contaminants backward.

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• Which backflow prevention assembly provides the highest level of

protection?

• Double check valve assembly (DCVA)
• Pressure vacuum breaker (PVB)
• Spill-resistant vacuum breaker (SVB)
• Reduced pressure principle assembly (RP)

RP assemblies provide the highest protection level because they have a relief valve to discharge contaminants.

6. The test cocks on a double check valve assembly are used to:

• Connect test equipment and measure differential pressure
• Drain water from the assembly
• Control flow direction
• Relieve pressure

Test cocks allow testers to measure pressure differences across check valves.

• The minimum pressure differential required for a check valve in a DCVA to

be considered functional is:

• 1.0 psi
• 2.0 psi
• 1.0 psi or greater
• 0.5 psi 3 / 4

Each check valve in a DCVA must maintain at least 1.0 psi to be acceptable under ASSE 5110 standards.

8. The relief valve in an RP assembly must open before:

• The first check valve closes
• The differential pressure across the first check drops below 2.0 psi
• The second check opens
• Supply pressure increases

This ensures any backpressure or backsiphonage is vented safely, maintaining system protection.

• Which tool is essential for performing a backflow test?
• Torque wrench
• Pressure gauge only
• Differential pressure gauge
• Manometer

Differential pressure gauges measure the pressure drop across test points, critical for accurate testing.

• When testing an RP assembly, the relief valve should open when the

pressure differential across check valve #1 drops below:

• 1 psi
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