Exam (elaborations)
Introduction to Water Distribution Questions and Answers 2024
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Introduction to Water Distribution
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Introduction to Water DistributionUnder what conditions may water mains be located adjacent to sewer lines?
1. When the same utility agency is responsible for both systems
2. When both lines can be placed in the same trench
3. When physical conditions or soil conditions prevent minimum separation distances
from being met
4. When the groundwater table is low and the soil is dry - answer3. When physical
conditions or soil conditions prevent minimum separation distances from being met
How can corrosion be prevented on the insides of cement or metal pipes?
1. Ensure proper construction techniques
2. Line with asphalt or coal tar coatings
3. Properly disinfect the water mains after installation
4. Minimize the length of pipe underground - answer2. Line with asphalt or coal tar
coatings
What influences the knowledge and skills required to work as a water distribution
system operator in a given system.
1. The certification board rating point system
2. the size and type of water distribution system
3. the number of operators on staff
4. the requirements imposed by the regulatory agency - answer2. the size and type of
water distribution system
What are organics?
1. Chemical substances that are based on the element carbon
2. Chemical substances that are based on nutrients
3. Chemical substances that are based on vegetable origins
4. Chemical substances that are based on water - answer1. Chemical substances that
are based on the element carbon
Why are chloramines more effective against biofilms than chlorine?
1. More toxic
2. More persistent
3. Stronger bioaccumulant
4. Stronger disinfectant - answer2. More persistent
, Why have drinking water quality standards been prepared and used?
1. to determine the capacity of water storage facilities
2. to ensure that pumps deliver water at all times
3. to provide the needed quality control and ensure the acceptability of the product
4. to require laboratories to develop detailed procedures - answer3. to provide the
needed quality control and ensure the acceptability of the product
Why is water quality monitoring of distribution systems important?
1. to measure actual water quality in reservoirs
2. to identify when and where water quality changes occur in the system
3. to collect samples for laboratory analysis
4. to identify the location of actual sampling stations - answer2. to identify when and
where water quality changes occur in the system
When water lines are being repaired, how can possible contamination of the water line
be prevented?
1. keep pedestrians and children away from the hole
2. keep the hole dewatered
3. keep the trench properly shored
4. keep the customers supplied with water - answer2. keep the hole dewatered
What are pathogens?
1. iron bacteria
2. insect larvae
3. slime growths
4. disease causing organisms - answer4. disease causing organisms
What is the primary responsibility of a water treatment plant?
1. to keep consumers happy with their water
2. to apply a minimum cost mode of operation
3. to meet all demands for water at all times
4. to produce a safe and palatable water - answer4. to produce a safe and palatable
water
What is considered the greatest water quality nuisance?
1. biological growth activity
2. Cross connections
3. Corrosion and precipitation of iron
4. Milky water caused by air - answer3. Corrosion and precipitation of iron
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