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Water - Distribution System Operation and Maintenance Chapter 5 > Questions > Flashcards

Flashcards in Questions Deck (31)
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1
Q

True/False
The water supplier’s Management & operation have the legal responsibility for delivering safe water to their customers.

A

True

2
Q

True/False
Critical areas of the distribution system should be patrolled routinely so that the water utility will have an early warning of any adverse conditions that might appear.

A

True

3
Q

True/False

Operators should use Force to remove any Vandal encounter on utility property.

A

False

4
Q

A lack of chlorine residual in a distribution system could indicate the potential presence of heavy contamination.

A

True

5
Q

True/False

Operators should have access to Emergency Equipment and rental equipment with the authority to act.

A

True

6
Q

True/False

Disinfection systems with lower pressures produce more leakage.

A

False

7
Q

True/False

Meters tend to overregister as they get older

A

False (under register)

8
Q

True/False
All pipe installations should be inspected and tested for leaks by the Water Utility agency after the installation is covered with backfill.

A

False

9
Q

True/False

Flushing is commonly practiced after receiving water quality complaints.

A

True

10
Q

True/False
When performing electrical thawing of frozen water services, remove any electrical grounds that are connected to the pipe in that building.

A

True

11
Q

True/False

When thawing frozen fire hydrants, make sure the hydrant is in the off position before starting the thawing process.

A

True

12
Q

True/False

Repairing in-line (installed) gate valves is an easy task.

A

False

13
Q

True/False

When a water meter is taken out of service in the field, allow the inside of the meter to dry out.

A

False (page 229)

14
Q

True/False
When looking for water main breaks under pavement, poke in areas where underground electrical or other types of cables may be buried.

A

False

15
Q

True/False

Repair of water mains Under Pressure presents little danger of contamination and disinfection is NOT required.

A

True

16
Q

True/False
A geographic information system (GIS) can generate work orders in the form of a map with the work to be performed outlined on the map.

A

True

17
Q

True/False

All complaints should be treated as legitimate and investigated as soon as possible.

A

True

18
Q
Best Answer
Why are test pipes specimens (coupons) placed in water Distribution Systems?
1. To measure the cavitation of water 
2. To measure the corrosiveness of water
3. To measure the flow of water 
4. To measure the velocity of water
A
  1. To measure the corrosiveness of water
19
Q

Best Answer
What is the purpose of a sanitary survey?
1. To control the microbial water quality in the distribution system
2. To ensure protection of the water supply from all pollution sources.
3. To search for sanitary defects or hazards in the system.
4. To survey the sources of a water supply.

A
  1. To ensure protection of the water supply from all pollution sources.
20
Q

Best Answer
What is should samples be obtained for the best and truest evaluation of water quality?
1. Directly from the consumers Taps.
2. Directly from the main at specially-designed sampling stations.
3. Directly from the source of the water supply.
4. Directly from the treatment plants clear well.

A
  1. Directly from the main at specially-designed sampling stations.
21
Q

Best Answer
Why must a continuous positive pressure be maintained at all times in the water distribution System?
1 To have water available for fire protection
2 To minimize complaints from lack of water
3 To prevent contamination from backflow
4 To reduce unaccounted for water losses due to leaks

A

3 To prevent contamination from backflow

22
Q

Best Answer
What is the main function of a distribution system storage Reservoir?
1. To allow sediment to settle out of the water
2. To enhance the aesthetic appearance of a neighborhood
3. To provide for chlorine contact time for disinfection
4. To take care of daily demands as well as Peak demands.

A
  1. To take care of daily demands as well as Peak demands
23
Q

Best Answer
How can a leak detection program be economically Justified?
1. If a reduction in flow of leaks can reduce cost savings greater than the cost of maintaining a leak detection field crew.
2. If rate payers are willing to pay increased cost.
3. If the benefits from satisfied consumers is greater than the cost.
4. If the cost of pipe replacement is less than O&M cost.

A
  1. If a reduction in flow of leaks can reduce cost savings greater than the cost of maintaining a leak detection field crew.
24
Q

Best answer
What is the purpose of pipe Flushing?
1. To clean out distribution pipelines by removing any impurities or sediment that may be present in the pipe
2. To maintain minimum dry weather Flows In nearby Creeks.
3. To remove stale or stagnant water from the system.
4. To swap out the inside of pipes prior to disinfection.

A
  1. To clean out distribution pipelines by removing any impurities or sediment that may be present in the pipe
25
Q

Best answer
What is unidirectional Flushing?
1. Always flushing up here.
2. Ensuring the flushing crews are always working in the same direction.
3. Planning the flushing operation to avoid back pressure and backsiphonage
4. Starting at or near the source of Supply on working outword into the distribution system.

A
  1. Starting at or near the source of Supply on working outword into the distribution system.
26
Q

Best Answer
What is the primary purpose of distribution system shut off valves?
1. To adjust pressures to maintain minimum pressures
2. To control water hammer
3. To direct flow to high demand areas
4. To isolate small areas for emergency maintenance

A
  1. To isolate small areas for emergency maintenance
27
Q

Best Answer
What is underregistration by a water meter of serious concern to a water utility?
1. Because of a loss of Revenue.
2. Because of the unfairness to Consumers.
3. Because the meter could start leaking at any time.
4. Because the meter needs to be repacked.

A
  1. Because of a loss of Revenue.
28
Q

Best Answer
What could be the result of an adequate disinfection of distribution system Mains and reservoirs?
1. A need to increase the number of chlorine residual Test.
2. A reduction in consumer complaints of water testing like chlorine.
3. A reduction in the corrosiveness of the word.
4. A waterborne disease outbreak somewhere in the community.

A
  1. A waterborne disease outbreak somewhere in the community.
29
Q

Best Answer
Why must the storage conditions for calcium hypochlorite be controlled?
1. To prevent deterioration or reaction with combustible chemicals or materials.
2. To prevent Escape of chlorine odors.
3. To prevent formation of Trihalomethanes.
4. To prevent superchlorination of drinking water.

A
  1. To prevent deterioration or reaction with combustible chemicals or materials.
30
Q

Best answer
What is a geographic information system GIS a computer program that what?
1. Assists planners follow zoning patterns.
2. Combines mapping with detailed information about the physical characteristics within Geographic areas.
3. Record and analyzes trends in system flows.
4. Stores and sorts maintenance information

A
  1. Combines mapping with detailed information about the physical characteristics within Geographic areas.
31
Q

Best answer
What is a vulnerability assessment of a water distribution system?
1. A determination of the funding needed to recover from the disaster.
2. A determination of where the weaknesses are if the disaster being considered took place.
3. A determination which parts of a system need repair / replacement.
4. A determination of which staff can respond to the disaster.

A
  1. A determination of where the weaknesses are if the disaster being considered took place.