Welcome to the 100 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
How often should chlorine supply lines be replaced?
2.
Class B fire involves?
4.
What is the minimum velocity that a water main should be flushed?
5.
What contributes to the creation of algae blooms?
6.
A measurement of the interior roughness of a pipe is?
7.
If special bedding is required due to poor local soil conditions, the material should not contain granular material greater than?
8.
The operating valve for a dry barrel fire hydrant is located?
9.
In order for a sample to be considered a, "First Draw Sample" for Lead & Copper testing, the water must?
10.
The lowest pressure point in a pump is?
11.
What type of pipe joint consists of two machined surfaces?
12.
What is the equation for Ohm's law?
13.
Friction head loss can be calculated using tables based on?
15.
The lowest layer in a reservoir is?
16.
The type of water main pipe most appropriate for river crossings and rugged terrain is?
17.
When digging a trench to install or repair a water main, where does the soil go?
18.
A 1 ton cylinder filled with chlorine weighs approximately?
19.
How many feet must a ladder extend above the trench?
20.
Push on Joints are unpopular and can not be assembled in the field.
22.
What type of joint is for steel piping?
23.
What determines the minimum number of bacteriological samples that must be collected in a water distribution system?
24.
How does OSHA define a competent person?
25.
The Surface Water Treatment Rule requires that disinfectant residuals be collected at the same location in the distribution system as?
26.
What is the only acceptable breathing device to wear when handling chlorine leaks?
27.
If a lane on a road needs to be closed due to an excavation and the speed limit is 45mph, how many cones are required to divert traffic?
28.
The disinfection power of chlorine goes down as the pH decreases?
29.
What gauge is used to perform hydrant flow testing?
30.
An approved backflow assembly that can be used to prevent backflow and backsiphonage is?
31.
An illness in infants known as methemoglobinemia, or blue baby syndrome, is attributed to?
32.
One of the best ways to prevent freezing in a storage tank is to?
33.
The cl2 residual in water may be determined by using the reagent?
34.
What color will the DPD indicator powder turn water?
35.
The two types of pump seals are?
36.
Valve opening and closing is the main cause of hydraulic transient in a water distribution system.
37.
Where do good public relations start for any water district?
38.
Hydrogen Sulfide is a dangerous gas that has a rotten egg odor and can be deadly to a water operator. What should you do if you encounter the smell?
39.
What is lake stratification?
40.
To ease installation of impeller wear rings, they can be?
41.
What is a measure of a materials opposition to the flow of electric current?
42.
Venturi meters are used for?
43.
Newly installed water mains should be flushed
44.
What is the sample size for lead and copper analysis?
45.
If a water system fails to collect their water distribution system samples, under which public notification tier would the water system fall under?
46.
Class C fire involves?
47.
Who should be contacted to ensure proper disposal of water coming from the ground during trenching?
48.
What type of meter has no moving parts?
49.
A revised drawing created and submitted by a contractor after a construction project is finished is?
50.
What type of joint for connecting water pipes has the disadvantage of having a groove that weakens the pipe wall?
51.
At what time of the day is the age of the water stored in the distribution system tanks the lowest?
52.
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.
53.
When working in a confined space the oxygen level should never drop below?
54.
Public water systems using surface water must continuously monitor the disinfection residual entering the distribution system if serving more than?
55.
What is applied to electrodes placed in the water of a water storage tank?
56.
What type of pipe has the lowest normal maximum working pressure?
57.
What is the term for electrochemical corrosion caused by the joining of two different metals?
58.
If only two rings of packing are used in the stuffing box, the joints should be?
59.
The slope method to prevent trench cave ins require what slope ratio?
60.
The ISO recommends that non-looped water mains connected to fire hydrants have a diameter of at least?
61.
What type of valve is used to control the level in a water tank?
62.
What device found in labs sterilizes by using pressurized steam?
63.
A grout seal should be?
64.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
65.
What is the steel specimen inserted into water mains to measure the corrosiveness of the water is?
66.
Thrust blocks are installed to?
67.
What is used as an indicator to determine possible contamination in the drinking water?
68.
Which is a pathogen found in water?
69.
If a pump does not hold its prime, what could be wrong?
70.
An autoclave will sterilize at
71.
When responding to a chlorine gas leak, the responder should have a SCBA and a?
72.
The frequent starting of distribution pumps is a possible indication of?
73.
When a water main needs to be depressurized is must be what?
74.
What is the MCLG for lead in the drinking water?
75.
Why do insulators usually fail?
76.
The limnetic zone of a lake is?
77.
Pump rings can be classified as?
78.
What is the measure of a materials opposition to the flow of electrical current?
79.
What health effect category refers to an organic chemical that is a known carcinogen?
80.
Where ground frost is expected, how far away from any wall should the riser pipes be installed in a meter pit?
81.
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen.
82.
How many pounds of chlorine is capable of being withdrawn from a 150lb cylinder in a day?
83.
What is the term for water samples collected at regular intervals and combined in equal volume with each other?
84.
Who is the most responsible for your safety while on the job?
85.
What is an example of Tier III violation.
86.
What type of water distribution system configuration generally has smaller mains and terminates as dead ends?
87.
What is a closed fireline?
88.
What level of threshold odor number (TON) will result in a customer complaint?
89.
Records on bacterial analysis should be kept for a minimum of?
90.
Even during a fire event water pressure in a distribution system should never be allowed to drop below?
91.
What is the most common water complaint?
92.
What type of water meter is based on the Doppler effect?
93.
Where are the sampling points for required sampling of organic (except for THM's) in a community water system?
94.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
95.
Head loss in a water distribution system depends on
96.
What chemical decreases corrosion rates?
97.
What does hydrogen sulfide smell like?
98.
A dry barrel fire hydrant is used to?
99.
The sensors that respond to liquid pressure will perform poorly if what enters the sensor?
100.
Per Capita Water Use is?
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