Water Distribution 1 Exam Advanced
Practice 2026|2027 Questions and
Answers with Complete A+ Solutions
100% Correct!!!
New polyvinyl chloride pipe has a C value of about (roughness co-efficient) - Correct Answer -
150+
~~~~~~~~~~~~~Do you think an emergency storage tank is likely to contain potable water? -
Correct Answer -No
Which type of valve is used on hydraulic lines connected to valve actuators? - Correct Answer -
Needle valve
Which type of valve would be particularly useful for throttling the flow of corrosive liquids? -
Correct Answer -Pinch valve
Water meter pits are usually used in - Correct Answer -cold climates
A horizontal load, parallel to a pump shaft is called a - Correct Answer -thrust load
,Regarding fire flow, mains smaller than 6 inches should only be used - Correct Answer -to
complete a grid
Which type of pipe requires special external protection in high chloride soils? - Correct Answer -
Reinforced concrete
Which type of pipe is most likely to collapse or become distorted under partial vacuum? -
Correct Answer -Steel piping
Data manipulations using the basic elements of an automatic mapping system would include -
Correct Answer -modeling and analysis
Which data category for water utility data sets includes the following map layers: Control
information, planimetric features, and hydrology features? - Correct Answer -Base data
Which is the chlorine species called HTH - Correct Answer -Calcium Hypochlorite
Which is the proper detention time for disinfecting a water storage tank that is filled with
already chlorinated water such that the free chlorine residual is 10 mg/L after the proper
detention time is completed? - Correct Answer -6 hours
, Which is the proper detention time for disinfecting a water storage tank with water that is
mixed with hypochlorite already in the tank such that the free chorine is 10 mg/L after proper
detention time is complete? - Correct Answer -24 hours
The disinfectant residual in treated water entering the distribution system must not be less than
- Correct Answer -o.2 mg/L for more than 4 hours during periods where the system is serving
water to the public
The chemical formula for hypochlorous acid is - Correct Answer -HOCL
Usually the best disinfectant to use in large diameter pipes or very long pipelines is - Correct
Answer -chorine gas
Which method for controlling nitrification problems in a distribution system would result in a
temporary increase in trihalomethanes - Correct Answer -super chlorinating reservoirs and
storage tanks
Which is the available chlorine concentration used for disinfecting a water storage tank using a
method that involves spraying or painting all of the interior tank surfaces? - Correct Answer -20
mg/L
Practice 2026|2027 Questions and
Answers with Complete A+ Solutions
100% Correct!!!
New polyvinyl chloride pipe has a C value of about (roughness co-efficient) - Correct Answer -
150+
~~~~~~~~~~~~~Do you think an emergency storage tank is likely to contain potable water? -
Correct Answer -No
Which type of valve is used on hydraulic lines connected to valve actuators? - Correct Answer -
Needle valve
Which type of valve would be particularly useful for throttling the flow of corrosive liquids? -
Correct Answer -Pinch valve
Water meter pits are usually used in - Correct Answer -cold climates
A horizontal load, parallel to a pump shaft is called a - Correct Answer -thrust load
,Regarding fire flow, mains smaller than 6 inches should only be used - Correct Answer -to
complete a grid
Which type of pipe requires special external protection in high chloride soils? - Correct Answer -
Reinforced concrete
Which type of pipe is most likely to collapse or become distorted under partial vacuum? -
Correct Answer -Steel piping
Data manipulations using the basic elements of an automatic mapping system would include -
Correct Answer -modeling and analysis
Which data category for water utility data sets includes the following map layers: Control
information, planimetric features, and hydrology features? - Correct Answer -Base data
Which is the chlorine species called HTH - Correct Answer -Calcium Hypochlorite
Which is the proper detention time for disinfecting a water storage tank that is filled with
already chlorinated water such that the free chlorine residual is 10 mg/L after the proper
detention time is completed? - Correct Answer -6 hours
, Which is the proper detention time for disinfecting a water storage tank with water that is
mixed with hypochlorite already in the tank such that the free chorine is 10 mg/L after proper
detention time is complete? - Correct Answer -24 hours
The disinfectant residual in treated water entering the distribution system must not be less than
- Correct Answer -o.2 mg/L for more than 4 hours during periods where the system is serving
water to the public
The chemical formula for hypochlorous acid is - Correct Answer -HOCL
Usually the best disinfectant to use in large diameter pipes or very long pipelines is - Correct
Answer -chorine gas
Which method for controlling nitrification problems in a distribution system would result in a
temporary increase in trihalomethanes - Correct Answer -super chlorinating reservoirs and
storage tanks
Which is the available chlorine concentration used for disinfecting a water storage tank using a
method that involves spraying or painting all of the interior tank surfaces? - Correct Answer -20
mg/L
