AWWA AWWA Water Distribution Systems

Question 1

According to AWWA standards, what is the minimum residual chlorine level recommended at the extremities of a water distribution system?

Accepted Answer

0.1 mg/L

Answer

0.2 mg/L

Answer

0.5 mg/L

Answer

1.0 mg/L

Question 2

What type of valve is most commonly used for mainline isolation in a water distribution system per AWWA C509?

Accepted Answer

Gate valve

Answer

Globe valve

Answer

Ball valve

Answer

Butterfly valve

Question 3

Per AWWA guidelines, how often should fire hydrants be flow-tested to verify system pressure and flow capacity?

Accepted Answer

Annually

Answer

Every 6 months

Answer

Every 2 years

Answer

Every 5 years

Question 4

What is the standard pipe pressure class requirement for ductile iron pipe used in water distribution per AWWA C151?

Accepted Answer

Class 350

Answer

Class 50

Answer

Class 150

Answer

Class 200

Question 5

Which AWWA standard covers the installation of water mains?

Accepted Answer

AWWA C600

Answer

AWWA C200

Answer

AWWA C900

Answer

AWWA C110

Question 6

In a looped water distribution system, what is the primary advantage over a dead-end (branching) system?

Accepted Answer

Improved flow redundancy and water quality

Answer

Lower installation cost

Answer

Reduced pipe diameter requirements

Answer

Simpler hydraulic modeling