Water distribution system operation and
maintenance test review Exam
Questions With 100% Accurate Answers
What is the purpose of water distribution systems? - CORRECT ANSWER-To deliver
adequate quantities of water at sufficient pressure at all times under continually
changing conditions while at the same time protecting water quality
What is the purpose of vacuum, pressure-relief, and pressure-reducing valves? -
CORRECT ANSWER-To prevent pipe damage from negative or excessively high
pressures
Under what conditions is the solid-sheeting shoring method used? When it is necessary
to - CORRECT ANSWER-excavate in materials that will not stand in a vertical position
When making pipe extensions, why are wet taps preferred over dry taps? - CORRECT
ANSWER-Because any time the pressure in a pipeline is removed, contamination may
more easily enter that line
What problem can occur when air gets into the water in a pipeline and the air collects
forming pockets of air? - CORRECT ANSWER-Air pockets can increase the resistance
to flow or stop the flow of water completely
What is the advantage of the Venturi type of water meter? - CORRECT ANSWER-
extremely accurate at low flows
What could be the source of supply for a water distribution system? - CORRECT
ANSWER-Purchased water connection, wells, treatment plant clear well
, Water distribution system mains are laid out in what types of systems? - CORRECT
ANSWER-Grid, loop, tree(branching)
What are the basic requirements of pipes for water distribution systems? - CORRECT
ANSWER-Adequate strength, durability, maximum corrosion resistance, no adverse
effect on water quality
What type of shores have been tested and approved by OSHA? - CORRECT
ANSWER-Air shores, cylinder shoring, hydraulic shores, screw jacks, solid sheeting
Drinking water quality standards cover all potential chemicals that could enter a water
supply. True or False - CORRECT ANSWER-False
Coliform bacteria are considered pathogenic organisms. True or False - CORRECT
ANSWER-False
Chloramines are considered a more powerful disinfectant than chlorine. True or False -
CORRECT ANSWER-False
What does the term "water quality" mean? - CORRECT ANSWER-The composite
chemical, physical, and biological characteristics of a water supply
What are organics? - CORRECT ANSWER-Chemical substances that are based on
element carbon
What are slimes? - CORRECT ANSWER-Organic substances of a viscous nature
formed from microbiological growth
What conditions in water main dead ends can produce carbon dioxide, methane, and
foul sulfide odors? - CORRECT ANSWER-Anaerobic
maintenance test review Exam
Questions With 100% Accurate Answers
What is the purpose of water distribution systems? - CORRECT ANSWER-To deliver
adequate quantities of water at sufficient pressure at all times under continually
changing conditions while at the same time protecting water quality
What is the purpose of vacuum, pressure-relief, and pressure-reducing valves? -
CORRECT ANSWER-To prevent pipe damage from negative or excessively high
pressures
Under what conditions is the solid-sheeting shoring method used? When it is necessary
to - CORRECT ANSWER-excavate in materials that will not stand in a vertical position
When making pipe extensions, why are wet taps preferred over dry taps? - CORRECT
ANSWER-Because any time the pressure in a pipeline is removed, contamination may
more easily enter that line
What problem can occur when air gets into the water in a pipeline and the air collects
forming pockets of air? - CORRECT ANSWER-Air pockets can increase the resistance
to flow or stop the flow of water completely
What is the advantage of the Venturi type of water meter? - CORRECT ANSWER-
extremely accurate at low flows
What could be the source of supply for a water distribution system? - CORRECT
ANSWER-Purchased water connection, wells, treatment plant clear well
, Water distribution system mains are laid out in what types of systems? - CORRECT
ANSWER-Grid, loop, tree(branching)
What are the basic requirements of pipes for water distribution systems? - CORRECT
ANSWER-Adequate strength, durability, maximum corrosion resistance, no adverse
effect on water quality
What type of shores have been tested and approved by OSHA? - CORRECT
ANSWER-Air shores, cylinder shoring, hydraulic shores, screw jacks, solid sheeting
Drinking water quality standards cover all potential chemicals that could enter a water
supply. True or False - CORRECT ANSWER-False
Coliform bacteria are considered pathogenic organisms. True or False - CORRECT
ANSWER-False
Chloramines are considered a more powerful disinfectant than chlorine. True or False -
CORRECT ANSWER-False
What does the term "water quality" mean? - CORRECT ANSWER-The composite
chemical, physical, and biological characteristics of a water supply
What are organics? - CORRECT ANSWER-Chemical substances that are based on
element carbon
What are slimes? - CORRECT ANSWER-Organic substances of a viscous nature
formed from microbiological growth
What conditions in water main dead ends can produce carbon dioxide, methane, and
foul sulfide odors? - CORRECT ANSWER-Anaerobic
