Questions Flashcards
True False
Water storage facilities are used to store water when demands for water are high and to distribute water during periods of low demand.
False
Storage facilities are to provide water for average and Peak demands
True False
Periodically clear wells must be inspected for leaks.
True
True False
Standpipes constructed of Steel require less maintenance than those built of concrete.
False
Steel requires more maintenance.
True False
Standpipes can provide large volumes of water at high pressures.
False
Low pressures
True False
Hydropneumatic or pressure tank systems are a type of facility that is usually found in large water systems
False
Small water systems
True False
Hydropneumatic tanks must contain the proper amount of air to be effective
True
True False
What all pumps are operating at full capacity, there is a significant danger of backsiphonage into the water supply.
True
True False
When pumps are operating at full capacity, put on line, or taken off line, these conditions can create electrical power surges that may cause pump motors to trip out (stop working) and produce serious problems.
True
True False
In distribution storage facilities, water levels rise during Peak demands and drop during low demands.
False
water levels are lowered during Peak demands and rise furi g low demands
True False
Centrifugal pumps can operate when the impeller is above the water surface.
False
Centrifugal pumps cannot operate unless the impeller is submerged in water
True False
Be sure the gate to the water storage facility is locked to keep out vandals and unauthorized persons.
True
True False
In very cold climates, storage facilities are taken out of service and painted in the winter.
False
(The best time of year to take a storage facility out of service for complete cleaning and inspection is during the period of lowest water consumption)
True False
Always disinfect water storage facilities Whenever there has been any opportunity or contamination.
True
True False
After a water storage tank has been disinfected remaining mixture of chlorine in water must be properly disposed of.
True
True False
Regulator stations consists of a series of valves that reduce high pressures to lower, more acceptable working pressures.
True
Best Answer
What is the main purpose of a water storage facility?
1. To allow neighborhoods in the community to have their own storage facility. 2. To maintain a constant pressure at all times on every consumer’s tap.
3. To provide a sufficient amount of water to average or equalize daily demands on the water supply system.
4. To store water after treatment until it is properly “aged”.
- To provide a sufficient amount of water to average or equalize daily demands on the water supply system.
Best Answer
What is the primary use of elevated tanks?
To attract commercial and Industrial Development.
To enhance the scenery of a community.
To maintain an adequate and fairly uniform pressure to the service Zone.
To prevent graffiti and vandalism to storage facilities.
To maintain an adequate and fairly uniform pressure to the service Zone.
Best Answer
What is a limitation of elevated tanks?
Continuous pumping is required.
Eliminates availability of water for fires.
Increased auxiliary power requirements.
The pressure in the distribution system may vary with the water level in the tank.
The pressure in the distribution system may vary with the water level in the tank.
Best Answer
What are standpipes?
Pipes that stand on the ground with the most of the pipe below the ground surface.
Pipes that stand on the ground without any support.
Tanks that stand on the ground and have a height greater than their diameter. Tanks that stand on the ground and have an outlet pipe near the top.
Tanks that stand on the ground and have a height greater than their diameter.
Best Answer
Why should all reservoirs be covered?
To reduce the amount of evaporation.
To reduce the paint required to cover the reservoir.
To reduce the possibility of contamination.
To reduce the time required to inspect the reservoir.
To reduce the possibility of contamination
Best Answer
Why must Reservoir vents be adequate and never blocked?
To reduce surface runoff to flow into the reservoir when it is available.
To avoid weakening the structural stability of the reservoir.
To meet maximum daily flow demands.
To prevent pressures from developing in the reservoir when it fills or a vacuum when it empties or is drained.
To prevent pressures from developing in the reservoir when it fills or a vacuum when it empties or is drained.
Best Answer
What is hydro pneumatic or pressure tank system?
A system in which a water pump is controlled by the air pressure in a tank partially filled with water.
A system in which large amounts of water are stored in the hydro pneumatic tank.
A system in which only one home can be connected to the hydropneumatic tank
A system in which water is compressed in a pressure tank.
A system in which a water pump is controlled by the air pressure in a tank partially filled with water.
Best Answer
Why must care be used when operating and maintaining hydropneumatic tanks, especially the pressure relief valve?
Because a vacuum can easily be developed in the system.
Because O&M is a complex process.
Because of the high pressure in the tank.
Because the potential to fall into the water and drown.
Because of the high pressure in the tank.
Best Answer
What will happen if there is a lack of sufficient air in a hydropneumatic tank?
A rapid start- stop cycling of the pump may result in equipment damage. Excessive pressure may build up in the system.
The hydropneumatic tank may develop leaks.
The pump may lose its prime.
A rapid start- stop cycling of the pump may result in equipment damage.
Best Answer
What is backsiphonage?
A condition created when a backflow prevention device functions properly.
A condition created when water backs up or reverses direction in a water main.
A form of backflow caused by a negative or below atmosphere pressure within a water system.
A form of siphonage created when water is lifted over a hill by negative pressures.
A form of backflow caused by a negative or below atmosphere pressure within a water system.
Best Answer
What water quality problems could be caused by the use of food-grade oil in pumps?
Approved food-grade oil for pumps may be expensive and difficult to obtain
Pump motors operate at faster than design speeds and burn out
Serves as food for a thriving microorganism population on the tank bottom.
Switching to petroleum-grade oil may cause oily sludge on the tank bottom.
Serves as food for a thriving microorganism population on the tank bottom.
Best Answer
What is a Cross Connection?
A connection between a drinking (potable) water system and an unapproved water supply
A cross formed by the connection of two different types of pipe materials
A device used to prevent contamination of a drinking potable water system
A location where a drinking (potable) water system crosses over a wastewater system
A connection between a drinking (potable) water system and an unapproved water supply
Best Answer
What is disinfection?
The adjustment of pH to kill microorganisms
The covering of a surface to prevent corrosion
The inactivation or destruction of disease-producing organisms
The sterilitization of water
The inactivation or destruction of disease-producing organisms
Best Answer
Why should underground tanks never be emptied when the water table is high?
Pump could operate at less than optimum efficiency
Tank could float and crack
Unaccounted for water losses may increase
Water could leak into the tank
Tank could float and crack
What is the purpose of a booster pump?
To boost the elevation of underground tanks
To Increase the flow to a water treatment plant
To increase the pressure in the mains on the discharge side of the main pump
To pump water during power outages
To increase the pressure in the mains on the discharge side of the main pump
Multiple Choice
What are the purposes of a water storage facility?
To meet the needs for fire protection
To meet the needs for reserve storage
To provide water for average and peak demands
To provide water for industrial requirements
To store water for droughts
To meet the needs for fire protection
To meet the needs for reserve storage
To provide water for average and peak demands
To provide water for industrial requirements
Multiple Choice
Why are standpipes preferred to elevated storage tanks?
Easier to maintain
More accessible for observation
More accessible for sampling to determine the quality of the stored water
More objectionable from an aesthetic viewpoint
Safer to work around
Easier to maintain
More accessible for observation
More accessible for sampling to determine the quality of the stored water
Safer to work around
Multiple Choice
When a vacuum is created in a distribution system, this may result in the introduction of contamination to the water mains. If this happens, what should operators do?
Apply additional pressure to the distribution system
Flush the system
Issue boil-water orders to consumer’s
Recirculate the water for retreatment
Sample for coliforms to be sure the water is safe to drink
Flush the system
Issue boil-water orders to consumer’s
Sample for coliforms to be sure the water is safe to drink
Multiple Choice
Why should reservoir overflow and air vents be screened?
So that birds cannot enter the reservoir
So that debris cannot enter the reservoir
So that rodents cannot enter the reservoir
So that snakes cannot enter the reservoir
So that surface runoff water cannot enter the reservoir
So that birds cannot enter the reservoir
So that debris cannot enter the reservoir
So that rodents cannot enter the reservoir
So that snakes cannot enter the reservoir
Multiple Choice
What abnormal operating conditions may be encountered when operating water storage tanks?
- Broken or out-of-service pumps, mains or tanks
- Excessive water demands, such as fire demands
- Stale water in tanks creating tastes and odors
- System pressures are within desired targeted levels
- Tank levels are drawn down to meet demands and increase when demands decrease
- Broken or out-of-service pumps, mains or tanks
- Excessive water demands, such as fire demands
- Stale water in tanks creating tastes and odors
Multiple Choice
What problems may be encountered by operators when using electrodes to sense water levels in storage tanks?
Electrode measurements very with water temperature.
Electrodes may corrode or become contaminated, thus requiring replacement.
Electrodes must be calibrated regularly.
Sensitivity of electroids may vary.
When the electrodes need replacement or repair, they may be difficult to reach.
Electrodes may corrode or become contaminated, thus requiring replacement.
When the electrodes need replacement or repair, they may be difficult to reach.
Multiple Choice
How can a pump be primed so the impeller is submerged in water?
A priming water tank.
Air may be removed from the pump casing by the use of a vacuum pump.
An axillary water supply.
Installation of a foot valve in the inlet of the pump suction pipe.
Use of a special primer pump to pump water into the pump casing
All of the above
Which indicators can be used to help decide when a storage tank will need cleaning?
Excessive color, taste, and odors. High iron and manganese levels. Positive bacteriological samples. Staining of Plumbing fixtures. Turbidities over an accepted standard
Excessive color, taste, and odors.
Positive bacteriological samples.
Turbidities over an accepted standard
Multiple Choice
Operators must be able to troubleshoot what types of water quality problems and storage tanks and Distribution Systems?
Color. Positive coliform results Taste and odors Turbidity Unaccounted for water losses
Color.
Positive coliform results
Taste and odors
Turbidity
Multiple choice.
What are possible causes of water quality turbidity problems in storage tanks and Distribution Systems?
Calcium carbonate Floc carry over High chlorine residual Microscopic organisms Silt or clay in suspension
Calcium carbonate
Floc carry over
Microscopic organisms
Silt or clay in suspension
Multiple choice
Before anyone ever enters a tank for any reason, which safety procedures must be followed?
All persons entering a tank must wear a safety harness.
First test the atmosphere in the tank for oxygen.
One person trained in tank rescue procedures, safety, and first aid must remain at the tank entrance observing the actions of a person in the tank. Provide adequate ventilation especially when painting.
Test the atmosphere in the tank forecast bustable and toxic gases
All of the above
Multiple choice
If drying time for paint on a tanks interior walls is insufficient, what problems could develop?
Colored water leaching of potentially toxic materials streaks on the walls taste and odors unhappy maintenance manufacturer
leaching of potentially toxic materials
taste and odors
Multiple choice
Which chemical Inhibitors are used to reduce the rate of corrosion? Caustic soda. Phosphate. Polyphosphate. Soda ash sodium hexametaphosphate
Phosphate.
Polyphosphate.
sodium hexametaphosphate
Multiple choice
Which of the following chemicals are chlorine neutralization chemicals?
Soda Ash sodium bisulfite (NaHSO3) sodium sulfite (Na2SO3) sodium thiosulfate (Na2S2O3) sulfur dioxide (SO2)
sodium bisulfite
sodium sulfite
sodium thiosulfate
sulfur dioxide
Multiple choice
When working around water storage facilities, which safety hazards should be a personal concern to you?
Make sure adequate ventilation is available during inspection or maintenance of the facility.
Make sure the area around the storage facility is clean and clear of debris. Test the atmosphere before entering a storage facility for inspection.
Use a ladder safety belt when using ladders.
Use care when climbing storage facility ladders or stairways.
All of the above
