Water distribution practice test D1 /D2 Questions With Complete Solutions
The only absolutely reliable method of backflow prevention is the use of - (ANSWER)Air Gap
The bubbles formed in a positive multiple tube fermentation test are - (ANSWER)Carbon Dioxide
The maximum rate of withdrawal of gas from a 150lb chlorine cylinder in 24-hours is - (ANSWER)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? - (ANSWER)Rotate the container to place the leak at the top
The most commonly used water disinfectant in the United States is - (ANSWER)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 - (ANSWER)As long as necessary to permit cleaning of service line
Sample bottles wich are furnished by a certified laboratory for collection of bacteriological samples -
(ANSWER)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 - (ANSWER)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 - (ANSWER)Altitude valve
In an occupied trench requiring personal egress what is the maximum allowable distance between a
worker and an exit letter - (ANSWER)25 feet
A water bearing formation in the soil is referred to as - (ANSWER)An aquifer
The distance between the static water level and the pumping water level is termed the -
(ANSWER)Drawdown
, Water distribution practice test D1 /D2 Questions With Complete Solutions
To prevent the entry of surface contamination into a well is the purpose of - (ANSWER)Sanitary seal
The presence of coliform bacteria in a distribution system - (ANSWER)Indicates that pathogenic
organisms may be present also
The most common valve type in water distribution system is the - (ANSWER)Gate valve
A Venturi is a device used to - (ANSWER)Measure water flow
Backspin is occurring after well shut down this indicates - (ANSWER)A faulty check valve
A ph reading of 6.0 units indicates the water sample is - (ANSWER)Slightly acidic
Chlorine gas - (ANSWER)Is heavier than air
The change in what're demand during the course of a day is called - (ANSWER)Diurnal variation
Catholic protection is a system used for - (ANSWER)Metallic corrosion inhibition
The elevation of the free surface in a water table well wich is not running is called - (ANSWER)Static
water level
The maximum momentary load placed on a water supply system is known as - (ANSWER)Peak demand
Most below ground level storage tanks are constructed of - (ANSWER)Concrete
Hey bacteriological sampling bottle should be - (ANSWER)Filled carefully to leave a small air space
The only absolutely reliable method of backflow prevention is the use of - (ANSWER)Air Gap
The bubbles formed in a positive multiple tube fermentation test are - (ANSWER)Carbon Dioxide
The maximum rate of withdrawal of gas from a 150lb chlorine cylinder in 24-hours is - (ANSWER)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? - (ANSWER)Rotate the container to place the leak at the top
The most commonly used water disinfectant in the United States is - (ANSWER)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 - (ANSWER)As long as necessary to permit cleaning of service line
Sample bottles wich are furnished by a certified laboratory for collection of bacteriological samples -
(ANSWER)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 - (ANSWER)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 - (ANSWER)Altitude valve
In an occupied trench requiring personal egress what is the maximum allowable distance between a
worker and an exit letter - (ANSWER)25 feet
A water bearing formation in the soil is referred to as - (ANSWER)An aquifer
The distance between the static water level and the pumping water level is termed the -
(ANSWER)Drawdown
, Water distribution practice test D1 /D2 Questions With Complete Solutions
To prevent the entry of surface contamination into a well is the purpose of - (ANSWER)Sanitary seal
The presence of coliform bacteria in a distribution system - (ANSWER)Indicates that pathogenic
organisms may be present also
The most common valve type in water distribution system is the - (ANSWER)Gate valve
A Venturi is a device used to - (ANSWER)Measure water flow
Backspin is occurring after well shut down this indicates - (ANSWER)A faulty check valve
A ph reading of 6.0 units indicates the water sample is - (ANSWER)Slightly acidic
Chlorine gas - (ANSWER)Is heavier than air
The change in what're demand during the course of a day is called - (ANSWER)Diurnal variation
Catholic protection is a system used for - (ANSWER)Metallic corrosion inhibition
The elevation of the free surface in a water table well wich is not running is called - (ANSWER)Static
water level
The maximum momentary load placed on a water supply system is known as - (ANSWER)Peak demand
Most below ground level storage tanks are constructed of - (ANSWER)Concrete
Hey bacteriological sampling bottle should be - (ANSWER)Filled carefully to leave a small air space
