AWWA Cross-Connection Control and Backflow Prevention 2

Question 1

How is an air gap defined as a backflow prevention method?

Accepted Answer

An unobstructed vertical separation between the water supply outlet and the flood level rim of a receiving vessel

Answer

A space maintained between two check valves inside a backflow preventer assembly

Answer

A vacuum created in the supply line to physically prevent backflow

Answer

A vent installed on the top of elevated water storage tanks

Question 2

Which AWWA standard covers double check valve backflow prevention assemblies?

Accepted Answer

AWWA C510

Answer

AWWA C200

Answer

AWWA C900

Answer

AWWA C150

Question 3

What does 'degree of hazard' mean in a cross-connection control program?

Accepted Answer

The classification of the severity of potential contamination if a backflow event occurs

Answer

The measured pressure differential between the supply and downstream systems

Answer

The physical distance between a water main and a potential contamination source

Answer

The volumetric flow rate that could pass through a cross-connection during backflow

Question 4

Where must an atmospheric vacuum breaker (AVB) be installed relative to control valves?

Accepted Answer

Downstream of the last control valve where it will not be under continuous pressure

Answer

Upstream of all control valves so it is always under supply pressure

Answer

At the water meter to protect the entire premise plumbing system

Answer

On the main supply line entering a building before any branch connections

Question 5

What is the minimum required air gap distance between a water supply outlet and the flood level rim of the receiving vessel?

Accepted Answer

Twice the pipe inside diameter or 1 inch, whichever is greater

Answer

Equal to the pipe inside diameter or 1 inch, whichever is greater

Answer

Three times the pipe inside diameter or 1 inch, whichever is greater

Answer

Twice the pipe inside diameter or 2 inches, whichever is greater

Question 6

Which type of premises typically requires the highest level of backflow protection at the utility service connection?

Accepted Answer

Fire suppression systems that use chemical additives such as antifreeze or foam concentrates

Answer

Single-family residential homes with standard plumbing

Answer

Commercial car washes with recycled water rinse systems

Answer

Restaurants with standard dishwashing equipment

Question 7

What is the primary purpose of a cross-connection control survey conducted by the water utility?

Accepted Answer

To identify and evaluate actual or potential cross-connections so appropriate backflow prevention can be required

Answer

To measure and record water pressure at all points on a customer's premises

Answer

To test the flow rate through customer meters for billing accuracy

Answer

To assess the structural integrity and material composition of customer service lines