Water Distribution Practice Questions with 100%
Correct Solutions
The term "clearwell" refers to a? - ANSWER Reservoir at the outlet of a water
treatment plant.
A mechanical device often employed to prevent the over-filling and/ on over-draining
of distribution system reservoir is the? - ANSWER Altitude Valve
The primary cause of water quality deterioration in distribution system is? - ANSWER
Water age
The top of the pipe is called? - ANSWER Soffit
The term "Springline" applies to? - ANSWER The midline of a pipeline
When possible, a water main should be tapped while still pressurized to? - ANSWER
Minimize contamination risk
A connection made into a water main that is full of under pressure is called a?
a. Cross connection
b. Valve box
c. Wet tap
d. Spinal tap - ANSWER c) Wet tap
,A special valve that is used almost exclusively to facilitate making connections to
pipeline is the?
a. Gate valve
b. Corporation stop
c. Altitude valve
d. Auxiliary valve - ANSWER b) Corporation Stop
Which of the following gases will deaden the sense of smell?
a. Carbon dioxide
b. Hydrogen sulfide
c. Methane
d. Oxygen - ANSWER b) Hydrogen Sulfide
The most commonly used meter on small domestic services?
a. Venturi meter
b. Propeller meter
c. Orifice plate meter
d. Nutating disc meter - ANSWER d) Nutating Disk Meter
Of the following, which is a positive displacement flow rate meter? - ANSWER
Nutating Disk
A Nutating disk is found in certain?
,a. Positive displacement pumps
b. Main line valves
c. Chemical feeders
d. Water meters - ANSWER d) Water meters
A pump is experiencing back-spin after it is shut down. What is the most likely cause?
- ANSWER Malfunction check valve
When fully open, which of the following valve types will have the highest friction loss?
a. Gate valve
b. Globe valve
c. Ball valve
d. All will have about the same friction loss. - ANSWER b) Glove valve
The main purpose of a butterfly valve in a water distribution system is for? -
ANSWER Isolation
The most likely means of connecting two pressure zone is through a? - ANSWER
Pressure reducing valve
The purpose of an air relief valve is to? - ANSWER Protect the pipe system
Which of the following devices is routinely used to reduce system pressure? -
ANSWER Globe valve
, A venture or a weir is a device that is used to ? - ANSWER Measured water flow
The most common valve in water distribution system is the?
a. Gate valve
b. Butterfly valve
c. Check valve
d. Globe valve - ANSWER a) Gate valve
Venturi meters operate under the principle of? - ANSWER Pressure differential
An auxiliary valve is always located adjacent to a? - ANSWER Fire Hydrants
If you encounter a liquid chlorine leak in a one-ton container. What action should
you take first, to reduce the severity of the leak?
a. Apply a caustic solution
b. Spray the container with water
c. Spray the container with an ammonia solution
d. Rotate the container to place the leak at the top - ANSWER d) Rotate the container to
place the leak at the top
The most commonly used water disinfectant in the United States is?
a. Chlorine Dioxide
b. Ozone
c. Chlorine and Ammonia (chloramines)
Correct Solutions
The term "clearwell" refers to a? - ANSWER Reservoir at the outlet of a water
treatment plant.
A mechanical device often employed to prevent the over-filling and/ on over-draining
of distribution system reservoir is the? - ANSWER Altitude Valve
The primary cause of water quality deterioration in distribution system is? - ANSWER
Water age
The top of the pipe is called? - ANSWER Soffit
The term "Springline" applies to? - ANSWER The midline of a pipeline
When possible, a water main should be tapped while still pressurized to? - ANSWER
Minimize contamination risk
A connection made into a water main that is full of under pressure is called a?
a. Cross connection
b. Valve box
c. Wet tap
d. Spinal tap - ANSWER c) Wet tap
,A special valve that is used almost exclusively to facilitate making connections to
pipeline is the?
a. Gate valve
b. Corporation stop
c. Altitude valve
d. Auxiliary valve - ANSWER b) Corporation Stop
Which of the following gases will deaden the sense of smell?
a. Carbon dioxide
b. Hydrogen sulfide
c. Methane
d. Oxygen - ANSWER b) Hydrogen Sulfide
The most commonly used meter on small domestic services?
a. Venturi meter
b. Propeller meter
c. Orifice plate meter
d. Nutating disc meter - ANSWER d) Nutating Disk Meter
Of the following, which is a positive displacement flow rate meter? - ANSWER
Nutating Disk
A Nutating disk is found in certain?
,a. Positive displacement pumps
b. Main line valves
c. Chemical feeders
d. Water meters - ANSWER d) Water meters
A pump is experiencing back-spin after it is shut down. What is the most likely cause?
- ANSWER Malfunction check valve
When fully open, which of the following valve types will have the highest friction loss?
a. Gate valve
b. Globe valve
c. Ball valve
d. All will have about the same friction loss. - ANSWER b) Glove valve
The main purpose of a butterfly valve in a water distribution system is for? -
ANSWER Isolation
The most likely means of connecting two pressure zone is through a? - ANSWER
Pressure reducing valve
The purpose of an air relief valve is to? - ANSWER Protect the pipe system
Which of the following devices is routinely used to reduce system pressure? -
ANSWER Globe valve
, A venture or a weir is a device that is used to ? - ANSWER Measured water flow
The most common valve in water distribution system is the?
a. Gate valve
b. Butterfly valve
c. Check valve
d. Globe valve - ANSWER a) Gate valve
Venturi meters operate under the principle of? - ANSWER Pressure differential
An auxiliary valve is always located adjacent to a? - ANSWER Fire Hydrants
If you encounter a liquid chlorine leak in a one-ton container. What action should
you take first, to reduce the severity of the leak?
a. Apply a caustic solution
b. Spray the container with water
c. Spray the container with an ammonia solution
d. Rotate the container to place the leak at the top - ANSWER d) Rotate the container to
place the leak at the top
The most commonly used water disinfectant in the United States is?
a. Chlorine Dioxide
b. Ozone
c. Chlorine and Ammonia (chloramines)
