ABC Backflow Prevention Assembly 4

Question 1

A spill-resistant pressure vacuum breaker (SRPVB) differs from a standard PVB primarily because it:

Accepted Answer

Has an enclosure that prevents relief discharge from spilling on the floor

Answer

Can be used against back-pressure conditions

Answer

Is approved for high-hazard applications

Answer

Does not require annual testing

Question 2

Which component of an RP assembly ensures that the zone between the two check valves remains at a lower pressure than supply, providing the 'reduced pressure' protection?

Accepted Answer

Relief valve

Answer

Outlet shutoff valve

Answer

Strainer screen

Answer

Second check valve

Question 3

Under ASSE/AWWA standards, backflow prevention assemblies must be tested how often after initial installation?

Accepted Answer

Annually

Answer

Every six months

Answer

Every two years

Answer

Only when maintenance is performed

Question 4

What is the purpose of the bypass valve configuration sometimes used with large-diameter RP assemblies?

Accepted Answer

To allow the assembly to be isolated and tested while maintaining system flow

Answer

To increase flow capacity through the assembly

Answer

To reduce water hammer during valve closure

Answer

To provide a secondary path if the primary checks fail

Question 5

Which scenario BEST describes a cross-connection?

Accepted Answer

A physical link between the potable supply and a non-potable source

Answer

Two potable water mains connected in a loop system

Answer

A tee fitting used to branch off a main supply line

Answer

A valve that connects two pressurized zones

Question 6

When a field tester connects differential pressure gauge hoses to a DCVA, the HIGH side hose connects to:

Accepted Answer

Test cock #1 (upstream of check #1)

Answer

Test cock #2 (between the checks)

Answer

Test cock #4 (downstream of check #2)

Answer

Test cock #3 (between the checks)

Question 7

A backflow incident in which the downstream system pressure EXCEEDS the supply pressure, pushing water back into the potable supply, is called:

Accepted Answer

Back-pressure backflow

Answer

Backsiphonage

Answer

Cross-contamination siphon

Answer

Pressure reversal event