Water distribution practice test D1 /D2 Questions
and answers Updated New!!
The only absolutely reliable method of backflow prevention is the use of - Ans Air Gap
The bubbles formed in a positive multiple tube fermentation test are - Ans Carbon Dioxide
The maximum rate of withdrawal of gas from a 150lb chlorine cylinder in 24-hours is - Ans 40
lbs
If you encounter a liquid chlorine leak in a one tone container, what action should you take
first, to reduce the severity of the leak? - Ans Rotate the container to place the leak at the top
The most commonly used water disinfectant in the United States is - Ans Chlorine
When collecting a distribution system sample, the water should be allowed to run for a period
of time prior to sample collection. How long - Ans As long as necessary to permit cleaning of
service line
Sample bottles wich are furnished by a certified laboratory for collection of bacteriological
samples - Ans Are ready to use
The difference between water pressure upstream and downstream of a pump when it is not in
operations is know as the - Ans Total static head
A device that automatically shuts off flow in an elevated storage tank when the water level in
the tank reache a preset level is termed a - Ans Altitude valve
, In an occupied trench requiring personal egress what is the maximum allowable distance
between a worker and an exit letter - Ans 25 feet
A water bearing formation in the soil is referred to as - Ans An aquifer
The distance between the static water level and the pumping water level is termed the - Ans
Drawdown
To prevent the entry of surface contamination into a well is the purpose of - Ans Sanitary seal
The presence of coliform bacteria in a distribution system - Ans Indicates that pathogenic
organisms may be present also
The most common valve type in water distribution system is the - Ans Gate valve
A Venturi is a device used to - Ans Measure water flow
Backspin is occurring after well shut down this indicates - Ans A faulty check valve
A ph reading of 6.0 units indicates the water sample is - Ans Slightly acidic
Chlorine gas - Ans Is heavier than air
The change in what're demand during the course of a day is called - Ans Diurnal variation
Catholic protection is a system used for - Ans Metallic corrosion inhibition
and answers Updated New!!
The only absolutely reliable method of backflow prevention is the use of - Ans Air Gap
The bubbles formed in a positive multiple tube fermentation test are - Ans Carbon Dioxide
The maximum rate of withdrawal of gas from a 150lb chlorine cylinder in 24-hours is - Ans 40
lbs
If you encounter a liquid chlorine leak in a one tone container, what action should you take
first, to reduce the severity of the leak? - Ans Rotate the container to place the leak at the top
The most commonly used water disinfectant in the United States is - Ans Chlorine
When collecting a distribution system sample, the water should be allowed to run for a period
of time prior to sample collection. How long - Ans As long as necessary to permit cleaning of
service line
Sample bottles wich are furnished by a certified laboratory for collection of bacteriological
samples - Ans Are ready to use
The difference between water pressure upstream and downstream of a pump when it is not in
operations is know as the - Ans Total static head
A device that automatically shuts off flow in an elevated storage tank when the water level in
the tank reache a preset level is termed a - Ans Altitude valve
, In an occupied trench requiring personal egress what is the maximum allowable distance
between a worker and an exit letter - Ans 25 feet
A water bearing formation in the soil is referred to as - Ans An aquifer
The distance between the static water level and the pumping water level is termed the - Ans
Drawdown
To prevent the entry of surface contamination into a well is the purpose of - Ans Sanitary seal
The presence of coliform bacteria in a distribution system - Ans Indicates that pathogenic
organisms may be present also
The most common valve type in water distribution system is the - Ans Gate valve
A Venturi is a device used to - Ans Measure water flow
Backspin is occurring after well shut down this indicates - Ans A faulty check valve
A ph reading of 6.0 units indicates the water sample is - Ans Slightly acidic
Chlorine gas - Ans Is heavier than air
The change in what're demand during the course of a day is called - Ans Diurnal variation
Catholic protection is a system used for - Ans Metallic corrosion inhibition
