CIT - Certified Irrigation Technician Certified Irrigation Technician Backflow Prevention Devices 1

Question 1

Which type of backflow prevention assembly uses two independent check valves and a differential pressure relief valve between them?

Accepted Answer

Reduced Pressure Zone Assembly (RPZ)

Answer

Double Check Valve Assembly (DCVA)

Answer

Pressure Vacuum Breaker (PVB)

Answer

Atmospheric Vacuum Breaker (AVB)

Question 2

An Atmospheric Vacuum Breaker (AVB) must NOT be installed in which of the following conditions?

Accepted Answer

Where the device will be subject to continuous pressure for more than 12 hours

Answer

On a system with static pressure below 60 psi

Answer

Upstream of a zone control valve

Answer

On a residential drip irrigation system

Question 3

When testing a Double Check Valve Assembly (DCVA), a tester finds that Check Valve #1 reads 2.0 psi and Check Valve #2 reads 1.0 psi. What is the correct assessment?

Accepted Answer

Both checks pass; the assembly is in good working order

Answer

Check Valve #1 fails because it must hold at least 3.0 psi

Answer

Check Valve #2 fails because it must hold at least 1.0 psi

Answer

Both checks fail because the minimum hold for a DCVA check valve is 1.0 psi, and both must exceed it

Question 4

A backflow preventer installed on an irrigation system serving a property with a fertilizer injector (chemigation) would BEST be protected by which assembly?

Accepted Answer

Reduced Pressure Zone Assembly (RPZ)

Answer

Atmospheric Vacuum Breaker (AVB)

Answer

Pressure Vacuum Breaker (PVB)

Answer

Double Check Valve Assembly (DCVA)

Question 5

Where must the air gap distance between the supply pipe outlet and the flood level rim of a receiving vessel be set, at minimum, according to standard plumbing code?

Accepted Answer

Twice the internal diameter of the supply pipe, but not less than 1 inch

Answer

Equal to the pipe diameter

Answer

Three times the internal diameter of the supply pipe

Answer

1/2 inch regardless of pipe size

Question 6

A technician is replacing a failed backflow preventer on an irrigation system and discovers the old device was installed below grade in a vault. Which of the following is the most important concern regarding the replacement installation?

Accepted Answer

Submerged or flooded vaults can expose the device to backpressure conditions that require an RPZ-rated assembly

Answer

The replacement device must be a PVB to comply with underground installation requirements

Answer

Underground installation automatically voids any manufacturer warranty

Answer

Only AVBs are approved for below-grade installation in most jurisdictions