Welcome to the 100 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
Mechanical seals on a centrifugal pump?
2.
Records of turbidity analysis must be kept for at least?
3.
The disinfection power of chlorine goes down as the pH decreases?
4.
What is the purpose of bypass valves where larger size gate valves are located on the water main?
6.
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen.
7.
The minimum desired water pressure is?
8.
What gas can cause lung and skin irritation?
9.
Where should air vac/air release valves be located?
10.
What type of sample should always be collected for determining the presence of coliform bacteria?
11.
Interior copper tubing is usually joined by?
12.
A pro of chloramines is?
13.
If a pump loses its prime because the suction line has an air pocket, the operator should?
14.
How much chlorine should be used when swabbing new water lines?
15.
What is used as an indicator to determine possible contamination in the drinking water?
16.
If a lane on a road needs to be closed due to an excavation and the speed limit is 25mph, how many cones are required to divert traffic?
18.
If only two rings of packing are used in the stuffing box, the joints should be?
19.
Coagulation occurs during the first
20.
The middle layer is a reservoir is?
21.
Soil that is cohesive contains a lot of?
22.
Surge tanks in the water system are used for?
23.
Intestinal parasites that may be transmitted in water are?
24.
What is a riparian water right?
25.
What is the equation for Ohm's law?
26.
You have a new gasoline powered diaphragm pump and are using heavy-duty spiral wire reinforced suction hose. What is the practical maximum height at which to set the pump above the water level?
27.
When using screw jacks to install shoring material within a trench, the jacks should always be installed?
28.
What organisms have the greatest resistance to chlorine?
29.
What is atmospheric pressure at sea level?
30.
Which of these is a displacement meter, which measure flow by registering the number of times that the meter chamber is filled and empty?
32.
Yellow hydrant body with an orange cap signals?
33.
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?
34.
The maximum chlorine withdraw rate from a 1 ton cylinder is?
35.
What type of joint is for steel piping?
36.
Critical safeguard(s) for a water distribution system are?
37.
A measurement of the interior roughness of a pipe is?
38.
How is the capacity of a centrifugal pump related to the total head?
39.
What is the typical strength of calcium hypochlorite?
40.
Yellow hydrant body with an orange cap signals?
41.
What type of valve is used to control the level in a water tank?
42.
What type of pipe has the lowest normal maximum working pressure?
43.
Inspection of a pump shaft and coupling should be performed?
44.
If air is used to generate ozone, which percentage of the air is usually converted to ozone?
45.
What is the unit of measurement used to express velocity in a water pipe?
46.
What is the only acceptable breathing device to wear when handling chlorine leaks?
47.
What is the term that defines the inactivation of pathogenic organisms in water?
48.
If an operator notices the bearings on a centrifugal pump are excessively hot, what is the most likely cause?
49.
How many times heavier than air is chlorine gas?
50.
Permit required confined space entry requires a chest or full body harness and a retrieval line.
51.
What is used on the outside joint space of a steel cylinder concrete in order to protect the joint rings from external corrosion?
52.
How long can samples being tested for coliforms be refrigerated before analysis?
53.
Almost all methods used to aerate a reservoir include?
54.
What is the electronic standard range?
55.
The proper emergency kit for a TON chlorine cylinder is?
56.
How many Milliliters (ml) are in 1 gallon of water?
57.
Where do good public relations start for any water district?
58.
What type of personal protective equipment should an operator wear when handling hypochlorite?
59.
When a bac-T sample is positive, repeat samples must be taken
60.
The arrangement of water pumps in parallel is typically used to?
61.
The lowest pressure point in a pump is?
62.
What is the best mechanical compacting equipment for deep narrow trenches?
63.
A gallon jug filled with water weighs?
64.
Compressive fittings used with copper or plastic tubing seal by using?
65.
A dry barrel fire hydrant is used to?
66.
What agency mandates the language and methods for public notification?
67.
An autoclave will sterilize at
68.
The amount of energy in feet required to overcome resistance to flow in a pipe is called?
69.
When digging a trench to install or repair a water main, where does the soil go?
70.
How often should pump bearings be re-greased?
72.
What is the rule that sets MCL's for harmful chemicals?
73.
Class D fire involves?
74.
The pulling or stretching of a water pipe without breaking is known as its?
75.
What does a, "Hot Bacti" refer to?
76.
Some water storage tanks have aviation warning lights on them. The FAA regulations require the bulbs to be replaced before they reach what percentage of their normal life expectancy?
77.
The disinfection action of chlorine as the water temperature increases will what?
78.
At what temperature will a fusible plug melt on a 150lb chlorine cylinder?
79.
Why do insulators usually fail?
80.
What agency establishes drinking water standards in the United States of America?
81.
The slope method to prevent trench cave ins require what slope ratio?
82.
What chemical decreases corrosion rates?
83.
What is the difference between a Primary and a Secondary standard in drinking water?
84.
If a dead end water main is more than a 1,000' in length, it is recommended that the main size should be at least what diameter?
85.
What conditions can cause a shoring system to fail?
86.
Shielding or a trench box must
87.
What is the MCLG for coliform bacteria?
88.
What is the appropriate angle for average soils when using the sloping method for the prevention of cave-ins? (Horizontal to Vertical Distance)
89.
What type of rigid coupling is easy to install and remove?
90.
What corrosion inhibitor is most effective in control of lead in a distribution system?
91.
When should packing replacement occur?
92.
What type of pipe is plastic?
93.
A possible cause of a complaint of cloudy water is?
94.
What effect will algae in a reservoir have on dissolved oxygen?
95.
The limnetic zone of a lake is?
96.
What type of water meter determines the total flow by multiplying the flow through meter by a factor?
97.
What contributes to the creation of algae blooms?
98.
Water taste and odor complaints can come from
99.
When using Chlorine tablets to disinfect a pipeline during installation, the tablets should be placed where?
100.
Who may sign the confined space permit?
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