Backflow Prevention Assembly Tester

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

1. The primary purpose of backflow prevention is to:

• Increase system water pressure
• Reduce water consumption
• Maintain water velocity
• Protect the potable water supply

Rationale: Protecting drinking water from contamination due to

backflow is the core purpose of backflow prevention.

2. A cross-connection is best defined as:

• A leak in a water main
• A chemical mixing with water 1 / 3

• Any actual or potential connection between potable and non-

potable water

• A pressure loss in a system

Rationale: A cross-connection creates the potential for contaminants

to enter potable water.

3. Backpressure occurs when:

• The supply pressure increases
• The downstream pressure becomes greater than the supply

pressure

• A vacuum is created in the supply line
• A check valve fails

Rationale: Backpressure is when downstream pressure exceeds

supply pressure, forcing flow backward.

4. Backsiphonage is caused by:

• Pumps shutting off
• Check valves closing
• Negative pressure in the supply line
• System expansion

Rationale: A vacuum or reduced pressure can siphon contaminants

back into potable water.

• The most serious type of hazard requiring the highest level of

protection is:

• Pollutant hazard 2 / 3

• Contaminant hazard
• Fire suppression hazard
• Leakage hazard

Rationale: Contaminants present health hazards and require the

strongest protection.

6. A Reduced Pressure Principle Assembly (RP) is required when:

• Only low hazards are present
• High hazards are present
• There is no backpressure risk
• The system is not pressurized

Rationale: RPs provide maximum protection against backpressure

and backsiphonage for high hazards.

7. The two shutoff valves on a testable assembly are:

• Relief and air inlet valves
• Isolation valves
• Drain valves
• Meter valves

Rationale: Shutoff or isolation valves allow the assembly to be

isolated for testing.

8. A check valve in a backflow preventer must:

• Always remain open
• Be sized larger than the pipe
• Close tightly to prevent reverse flow
• / 3