ABC Backflow Prevention Assembly 3

Question 1

A reduced pressure principle assembly must be installed with a minimum clearance above grade or the floor to allow for:

Accepted Answer

Observation, testing, and drainage of the relief valve discharge

Answer

Easier access to the shut-off valves only

Answer

Protection from freezing temperatures

Answer

Compliance with fire code requirements

Question 2

Which test cock on a double check valve assembly is used to introduce test equipment pressure to the space between the two check valves?

Accepted Answer

Test cock #3

Answer

Test cock #1

Answer

Test cock #2

Answer

Test cock #4

Question 3

What is the minimum upstream supply pressure typically required for a pressure vacuum breaker to operate correctly?

Accepted Answer

5 psi

Answer

1 psi

Answer

15 psi

Answer

25 psi

Question 4

Why is a pressure vacuum breaker (PVB) NOT acceptable for use against back-pressure conditions?

Accepted Answer

Back-pressure can force the check valve open, defeating protection

Answer

It is only approved for low-hazard applications

Answer

PVBs are too expensive for back-pressure applications

Answer

PVBs require more maintenance than RP assemblies

Question 5

Which of the following installation conditions would DISQUALIFY a pressure vacuum breaker?

Accepted Answer

Installed below the highest downstream outlet

Answer

Installed on an irrigation system

Answer

Installed indoors in a heated mechanical room

Answer

Installed with a listed shutoff valve upstream

Question 6

During an RP assembly test, the relief valve is observed dripping slowly. The tester should first:

Accepted Answer

Test the #1 check valve differential to determine if the relief is responding to a failing check

Answer

Replace the assembly immediately

Answer

Record the assembly as passing and note the drip

Answer

Increase upstream supply pressure to stop the drip

Question 7

The ABC certification exam for backflow prevention testers is administered under which national standard?

Accepted Answer

ASSE 5000

Answer

AWWA M14

Answer

USC FCCCHR List of Approved Backflow Prevention Assemblies

Answer

USC FCCCHR Standard: Tester Certification Requirements