Welcome to the 50 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
2.
What carcinogenic disinfection by product may be formed with chlorine is used to disinfect drinking water when organics are present?
3.
Taste and odor complaints in the water system can be caused by?
4.
Almost all methods used to aerate a reservoir include?
5.
Acid should always be diluted into water.
6.
Algae in a water reservoir can cause?
7.
What thrust control is easy to use, especially in locations where existing utilities or structures are numerous?
8.
How many feet must a ladder extend above the trench?
9.
According to the Surface Water Treatment Rule, water systems serving a population of more than 500 persons must sample the filtered water for turbidity every?
10.
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?
11.
Fire insurance underwriters recommend that no water main should have a diameter less than?
12.
What is a part of the well construction that is used to protect the aquifer, that is space between the drill hole and the well's protective casing?
13.
Mechanical seals on a centrifugal pump?
14.
The water level below the normal level that persists after a well pump has been off for a period of time is?
15.
Why do insulators usually fail?
16.
In an excavation a ladder must be placed within how many feet of every person in the trench?
17.
Shielding or a trench box must
18.
Aerobic bacteria live?
19.
What valve is the best for regulating flow?
20.
Although velocity head can usually be ignored, it be considered when it is what percent of pressure head?
21.
Fire fighting will never cause low pressure and backsiphonage in the water distribution system.
22.
Bar screens are used to?
23.
How many pounds of chlorine is capable of being withdrawn from a 150lb cylinder in a day?
24.
What is the best mechanical compacting equipment for deep narrow trenches?
25.
Which of these is a displacement meter, which measure flow by registering the number of times that the meter chamber is filled and empty?
26.
The minimum desired water pressure is?
27.
A trench should generally be no more than how many feet wider than the diameter of the water main?
28.
A gallon jug filled with water weighs?
29.
What is the minimum contact time when disinfecting water mains using the chlorine slug method?
30.
What type of joint is for steel piping?
31.
On a venturi meter the up or down stream pressure is compared to the pressure?
32.
What are the areas within a traffic zone?
33.
According to OSHA, an atmosphere is oxygen deficient if it contains less than what percent of oxygen by volume?
34.
A major break in a water main can assist the distribution operator to
35.
What type of pipe joint lacks flexibility and is not normally burried?
36.
What two chemicals cause water hardness?
37.
What is the most common water complaint?
38.
Yellow hydrant body with an orange cap signals?
39.
What is an appropriative water right?
40.
A water system should monitor the water source for?
41.
What level of threshold odor number (TON) will result in a customer complaint?
42.
To re-pack a burred gate valve, the valve must be
43.
How often should a ladder be placed in a trench?
44.
What gas can cause lung and skin irritation?
45.
A pump shafts main function is to?
46.
What is the National Primary Drinking Water Regulations MCL for total Hexavalent Chromium (Chromium 6)
47.
The amount of power in watts required during a certain time period is?
48.
Shoring is required in any excavation that is?
49.
What is a riparian water right?
50.
Water main cleaning methods include.
