Welcome to the 50 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
What type of map should not overlap each other?
2.
Records on bacterial analysis should be kept for a minimum of?
3.
What type of pipe requires special external protection in high-chloride soil?
4.
How do you respond to a consumer who contacts you while you are repairing a water main?
5.
When sampling for THM's, what percentage of samples must be taken at the furthest point in the distribution system?
7.
Venturi meters work on a?
8.
What device changes the alternating current to direct current by allowing the electric current to flow in one direction but blocks flow in the opposite direction?
9.
What is the recommended free chlorine residual for the furthest point in the water distribution system?
10.
On a venturi meter the up or down stream pressure is compared to the pressure?
11.
What element is found in all acids?
12.
Thrust blocks are not required when?
13.
What is the purpose of a vacuum regulator?
14.
What agency establishes drinking water standards in the United States of America?
15.
What is the term for water samples collected at regular intervals and combined in equal volume with each other?
16.
When PVC is stacked loose it should be stacked no higher than?
17.
What type of meter is usually 2" and under and sensitive to low flow rates?
18.
What is a closed fireline?
19.
When a bac-T sample is positive, repeat samples must be taken
20.
If a water system fails to collect their water distribution system samples, under which public notification tier would the water system fall under?
21.
What type of water distribution system configuration has interconnected water mains?
22.
Ideally, water mains should be flushed at what rate?
23.
A split case pump has three impellers. What type of multi stage pump is that?
24.
The normal pH range of surface and ground water is?
25.
What is the MCLG for coliform bacteria?
26.
The Surface Water Treatment Rule requires that disinfectant residuals be collected at the same location in the distribution system as?
27.
Water tanks storing treated water should be?
28.
What can be done to prevent cavitation form occurring?
29.
Where are water meters usually installed?
30.
The outlet of a forced ventilation system for a chlorinator room she be located?
31.
What is the purpose of bypass valves where larger size gate valves are located on the water main?
32.
The total dynamic head at which a pump must operate at is the sum of the static head and the head due to friction loss.
33.
What is the maximum contaminant level goal (MCLG) for a known or suspected carcinogen?
34.
What is the minimum contact time when disinfecting water mains using the chlorine slug method?
35.
What is the greatest problem for most water distribution shut off valves?
36.
An approved backflow assembly that can be used to prevent backflow and backsiphonage is?
37.
If a trench is 5' or more deep it must be?
38.
What type of pipe will gas and oil permeate?
39.
The sensors that respond to liquid pressure will perform poorly if what enters the sensor?
40.
A portable ladder must extend how many feet above the upper surface of an excavated trench?
41.
Inspection of a pump shaft and coupling should be performed?
42.
What is the minimum separation for an Air Gap?
43.
Uncombined chlorine that remains in the water after chlorine has been applied and allowed to react is?
44.
What is the term for electrochemical corrosion caused by the joining of two different metals?
45.
If air is used to generate ozone, which percentage of the air is usually converted to ozone?
46.
What is the steel specimen inserted into water mains to measure the corrosiveness of the water is?
47.
To re-pack a burred gate valve, the valve must be
48.
The ability of water to hold or contain dissolved oxygen (DO) is?
49.
What type of pipe is plastic?
50.
What is the volume of a bac-T sample (coliform sample)
