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Water Quality Considerations In Distribution Systems Chapter 4 > Questions > Flashcards

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1

True/ False

Each utility and, in turn, each operator working for that utility is responsible for the quality of water served to its customers

True

2

True/False

Drinking water quality standards cover all potential chemicals that could enter a water supply.

False (Doesn't cover all)

3

True/False

Coliform bacteria are considered pathogenic organisms

False
(Most Coliform bacteria themselves are not pathogenic organisms)

4

True/False

Ground waters are more susceptible to contamination than surface waters.

False
Groundwaters are less susceptible to Contamination

5

Once groundwaters are contaminated, they normally take considerably less time to recover than surface waters.

False
(It normally takes a considerable time before they recover)

6

True/False

Improved corrosion control improves biofilm disinfection.

True

7

True/False
As water mains and reservoirs become older, they require less and less maintenance.

False
( they require more and more maintenance)

8

True/False
The lack of trained, qualified, and adequately paid distribution system operators can contribute to water quality degradation in the distribution system.

True

9

True/False

Distribution system water quality can be adversely affected by improperly constructed or poorly located blowoffs or vacuum/air Relief valves.

True

10

True/False

In many case the water quality of a storage facility is related to water Clarity and surface debris.

True

11

Best Answer

What is the primary responsibility of a water treatment plant?

1) To apply a minimum cost mode of operation
2) To keep consumers happy with their water
3) To meet all demands for water at all time
4) To produce a safe and palatable water.

To produce a safe and palatable water

12

Best Answer
Why have drinking water quality standards been prepared and used?

1. To determine capacity of water storage facilities.
2. To ensure that pumps deliver water at all times.
3. To provide the needed quality control and to ensure quality of the product. 4. To require Laboratories to develop detail procedures.

3. To provide the needed quality control and to ensure quality of the product.

13

Best Answer
What are pathogens?
1. Disease-causing organisms.
2. Insect larvae.
3. Iron bacteria.
4. Slime growth.

1. Disease-causing organisms.

14

Best Answer
What is back siphonage?
1. A form of backflow caused by negative below atmospheric pressure in the water supply piping
2. A form of flow created by higher than normal pressures in the water supply piping.
3. A form of reverse flow caused by excessive contamination of the water supply piping.
4. A form of siphonage water out of containers or tanks into the water mains.

1. A form of backflow caused by negative (below atmospheric) pressure in the water supply piping

15

Best Answer

What causes backflow?

1. Back pressure that occurs when the user's water system is at a high higher pressure than the public water system.
2. Negative (below atmospheric) pressure in the water supply piping.
3. Reverse flow caused by excessive contamination of the water supply piping.
4. Siphoning water out of containers or tanks into the water mains.

1. Back pressure that occurs when the user's water system is at a high higher pressure than the public water system.

16

Best Answer

What are slimes?
1. Accumulations of lubricating oils in Distribution Systems.
2. Deposits of grease formed in water mains.
3. Microorganisms that are unable to attach to water mains.
4. Organic substances of a various nature formed from microbial growth.

4. Organic substances of a various nature formed from microbial growth.

17

Best Answer
How can corrosion be prevented on the insides of cement or metal pipes?
1. Ensure proper construction techniques.
2. Line insides with asphalt or coal tar Coatings.
3. Minimize the length of pipe underground.
4. Properly disinfect water mains after installation.

2. Line insides with asphalt or coal tar Coatings.

18

Best Answer
When water lines are being repaired, how can possible contamination of the waterline be prevented?

1. Keep pedestrians and children away from the hole.
2. Keep the customer supplied with water.
3. Keep the whole dewatered.
4. Keep the trench properly shored

3. Keep the whole dewatered.

19

Best Answer
Why shouldn't lines be flushed after a line has been repaired?
1. For compliance with codes and regulations.
2. For health reasons and to avoid consumer complaints.
3. To move any contamination to other parts of the system.
4. To supply the repaired line with fresh water.

2. For health reasons and to avoid consumer complaints.

20

Best Answer

Why is water quality monitoring of Distribution Systems important?

1. To collect samples for laboratory analysis.
2. To identify the location of actual sampling stations.
3. Do Identify when and where water quality changes occur in the system.
4. To measure actual water quality in reservoirs.

3. Do Identify when and where water quality changes occur in the system.

21

Multiple Choice
A domestic water supply is considered to be of good quality when it meets which criteria?

1. Attractive in taste and appearance.
2. Free of disease causing organisms.
3. Free of toxic chemicals.
4. Of a chemical composition that will be distributed without undue corrosive or scale forming effects on the Water System.
5. Will satisfy, to a maximum degree, the requirements of domestic and Industrial consumers.

ALL OF THE ABOVE

22

Multiple Choice

What are the potential consequences of providing water of a poor quality?
1. Consumers becoming ill.
2. Consumers being happy with the quality of the water.
3. Death of susceptible consumers.
4. Water being unacceptable to Consumers.
5. Water having unacceptable appearance or taste.

1. Consumers becoming ill.
3. Death of susceptible consumers.
4. Water being unacceptable to Consumers.
5. Water having unacceptable appearance or taste.

23

Multiple Choice
Existing drinking water quality standards generally relate to which issues?
1. Aesthetics (general attractiveness or appeal)
2. Cost.
3. Help.
4. Operation and maintenance.
5. Record-keeping

1. Aesthetics (general attractiveness or appeal)
3. Help

24

Multiple Choice

The primary drinking water standards have been set for which types of substances?
1. Disinfection by-products
2. Inorganic chemicals
3. Microorganisms
4. Organic chemicals
5. Taste

1. Disinfection by-products
2. Inorganic chemicals
3. Microorganisms
4. Organic chemicals

25

Multiple Choice
What's secondary drinking water standards have been set for which types of substances?
1. Color
2. Disinfection by-products
3. Odor
4. PH
5. Taste

1. Color
3. Odor
4. PH
5. Taste

26

Multiple Choice
What are physical qualities of water?
1. Color
2. Odor
3. Taste
4. Temperature
5. Turbidity

ALL OF THE ABOVE

27

Multiple Choice
What could be the cause of Milky water?
1. Air
2. Hardness
3. Microscopic organisms
4. Pesticides
5. Total dissolved solids TDS

1. Air
3. Microscopic organisms

28

Multiple Choice
Where can the contamination of water occur?
1. At the source of Supply
2. At the treatment plant
3. In distribution system storage facilities
4. In the evaporation/transpiration process.
5. In water mains.

1. At the source of Supply
2. At the treatment plant
3. In distribution system storage facilities
5. In water mains.

29

Multiple Choice
How can groundwater become contaminated?
1 By flood waters
2. By leaching from nearby agricultural waste water disposals
3. By leaching from nearby domestic Wastewater operations
4. By passage through natural mineralized formations.
5. By poorly constructed Wells

ALL OF THE ABOVE

30

Multiple Choice
Which factors influence the survival and possible re-growth of organisms (biofilms) in distribution systems?
1. Amount of bacterial nutrients in the deposits
2. Amount of exposure to residual concentrations of chlorine
3. Amount of hardness in the water
4. Water temperatures
5. Water total dissolved solids (TDS) levels

1. Amount of bacterial nutrients in the deposits
2. Amount of exposure to residual concentrations of chlorine
4. Water temperatures

31

Multiple Choice
What impact does water temperature have on distribution system water quality?
1. Biological decomposition may be intensified by summer temperature
2. Chlorine demand may be considerably greater so residuals won't carry as far in the distribution system in the summer.
3. Higher temperatures tend to increase biological growth rates.
4. Higher temperatures tend to increase evaporation rates and decrease quantities available to meet demands.
5. Higher temperatures tend to speed the rate of chemical reactions.

1. Biological decomposition may be intensified by summer temperature
2. Chlorine demand may be considerably greater so residuals won't carry as far in the distribution system in the summer.
3. Higher temperatures tend to increase biological growth rates.
5. Higher temperatures tend to speed the rate of chemical reactions.

32

Multiple Choice
What kinds of careless or poor operating procedures can result in water quality degradation in Distribution Systems?
1. In adequate cross-connection control.
2. Inadequate disinfection after repair or installation of new facilities.
3. Insufficient surveillance to determine whether the protective features for storage facilities and mains are still adequate
4. Poorly performed water quality monitoring and flushing programs.
5. Tolerance of low or negative pressures in the distribution system.

ALL OF THE ABOVE

33

Multiple Choice
What are possible sources of water quality degradation in water storage reservoirs?
1. Below grade construction.
2. Improperly screened overflows.
3. Inadequate covers.
4. Operation
5. Uncovered reservoirs

ALL OF THE ABOVE

34

Multiple Choice
How can water in below ground reservoirs be subject to contamination?
1. From any materials leaching through the soil and entering through a crack in the side wall.
2. From flooding by surface storm waters.
3. For inspection by operators.
4. From vandalism.
5. From wind-blown contamination.

1. From any materials leaching through the soil and entering through a crack in the side wall.
2. From flooding by surface storm waters.
4. From vandalism.
5. From wind-blown contamination.

35

Multiple Choice
Which items should be checked during a routine inspection on a continuously operated pump?
1. Amount of packing gland leakage
2. Discharge pressure
3. An electric current demand
4. Output flow.
5. Suction pressure

ALL OF THE ABOVE