CPWM Utility Systems 4

Question 1

A city's water system pressure zone has static pressure of 95 psi at the lowest point. What is the PRIMARY concern for system managers?

Accepted Answer

Excessive pressure causing main breaks and customer plumbing damage

Answer

Pressures above approximately 80 psi can cause accelerated pipe joint failure, increased leak rates, and damage to customer plumbing fixtures and appliances.

Question 2

What is the function of a pressure reducing valve (PRV) in a water distribution system?

Accepted Answer

To step down higher inlet pressure to a set lower downstream pressure

Answer

A PRV automatically reduces and maintains downstream pressure at a preset level regardless of fluctuating upstream pressure, protecting pipes and customers in lower pressure zones.

Question 3

Which federal regulation requires utilities to develop Emergency Response Plans (ERPs) for drinking water systems serving more than 3,300 people?

Accepted Answer

America's Water Infrastructure Act (AWIA) of 2018

Answer

AWIA 2018 requires community water systems serving more than 3,300 people to conduct Risk and Resilience Assessments and develop Emergency Response Plans.

Question 4

What does BOD₅ measure in a wastewater sample?

Accepted Answer

Biochemical oxygen demand over 5 days at 20°C

Answer

BOD₅ is the standard 5-day biochemical oxygen demand test conducted at 20°C that measures the amount of oxygen microorganisms consume while decomposing organic matter.

Question 5

A cathodic protection system is installed on a buried steel natural gas main. What is its purpose?

Accepted Answer

To prevent electrochemical corrosion by making the pipe a cathode

Answer

Cathodic protection applies electrical current to make the pipe the cathode of an electrochemical cell, preventing the oxidation (corrosion) reactions that would otherwise consume the metal.

(CPWM) Certified Public Works Manager Practice Test

(CPWM) Certified Public Works Manager Practice Test

CPWM Utility Systems 4