Welcome to the 100 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
The sensors that respond to liquid pressure will perform poorly if what enters the sensor?
2.
The IDLH (immediately dangerous to life and health) value for chlorine is?
3.
Why are fire hydrants commonly color coded?
4.
How long can samples being tested for coliforms be refrigerated before analysis?
5.
Water mains that are 12" or less in diameter should have isolation valves that are located not more than how many feet between each other?
6.
What method(s) should be used to prevent cave-ins while digging or trenching?
7.
In an excavation a ladder must be placed within how many feet of every person in the trench?
8.
Most regulated contaminants in drinking water?
9.
Yellow hydrant body with a green cap signals?
10.
The chlorine room should be constructed so it can only be entered from?
11.
Centrifugal force is generated?
12.
What type of meter has no moving parts?
13.
When PVC is stacked loose it should be stacked no higher than?
14.
What valve is used to dampen water hammer?
15.
Velocity of flow in water mains is usually expressed in?
16.
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?
17.
The breaking of a buried pipe when it is unevenly supported is called?
18.
What type of pipe requires special external protection in high-chloride soil?
19.
A grout seal should be?
20.
What is the odor detection limit for chlorine gas?
21.
Push joints can be used if the pipe must be pushed at an angle?
22.
Records on bacterial analysis should be kept for a minimum of?
23.
What color will the DPD indicator powder turn water?
24.
What chlorine concentration should be used to spray or paint disinfect the inside of a water storage tank?
25.
When did Congress enact the Safe Drinking Water Act?
26.
What is the measure of a materials opposition to the flow of electrical current?
27.
What type of polar bonds are between the hydrogen atoms and the oxygen atom in water?
28.
What valve should be used when it is needed to supply water to different pressure zones?
29.
The water level below the normal level that persists after a well pump has been off for a period of time is?
30.
A water system should monitor the water source for?
31.
How much deeper below the grade line of a pipe bottom should a trench be excavated if it is being dug in a rock formation?
32.
At what time of the day is the age of the water stored in the distribution system tanks the lowest?
33.
Why do insulators usually fail?
34.
What kind of gas can cause lung and skin irritation?
35.
If a water pump has sealed bearings, how often should they be lubricated?
36.
On a venturi meter the up or down stream pressure is compared to the pressure?
37.
What are the action levels for lead and copper?
38.
What is a closed fireline?
39.
Aerobic bacteria live?
40.
The lowest pressure point in a pump is?
41.
The Total Coliform Rule is based on?
42.
When water is being pumped from a well and the water table drops, this is known as?
43.
What is the typical strength of calcium hypochlorite?
44.
The two types of pump seals are?
45.
If ammonia vapor is passed over a chlorine leak from a cylinder valve, the leak is indicate by
46.
A water sample should be analyzed for a chlorine residual immediately, but if not the operator can analyze the sample for a chlorine residual within?
47.
The Surface Water Treatment Rule requires that disinfectant residuals be collected at the same location in the distribution system as?
48.
Intestinal parasites that may be transmitted in water are?
49.
If an operator gets sodium hypochlorite on their skin or in their eyes, immediately flush with water for how long?
50.
If an operator notices the bearings on a centrifugal pump are excessively hot, what is the most likely cause?
51.
What is the most common problem with a hypochlorinator?
52.
What thrust control is easy to use, especially in locations where existing utilities or structures are numerous?
53.
Milky water that clears in time from the bottom up is a possible indication of?
54.
What agency mandates the language and methods for public notification?
55.
The outlet of a forced ventilation system for a chlorinator room she be located?
56.
Soil that is cohesive contains a lot of?
57.
Ideally, water mains should be flushed at what rate?
58.
What type of fire hydrant has no main valve, but has a separate valve for each nozzle?
59.
Pipe strength is expressed in?
60.
Water filters in the water treatment processes are primarily used for removing or reducing?
61.
What organisms have the greatest resistance to chlorine?
62.
Some phase imbalance will occur in any system, but it should not exceed?
63.
The upper layer in a reservoir is the?
64.
Fire fighting will never cause low pressure and backsiphonage in the water distribution system.
65.
Coagulation occurs during the first
66.
Why is it important to monitor the speed of a variable speed pump?
67.
What is the MCL for THM's?
68.
What is the minimum separation for an Air Gap?
69.
What valve can go from fully open to fully closed with 1/4 turn?
70.
What is the pneumatic standard range?
71.
A detailed map of the entire distribution system is?
72.
Chlorine is chosen over chloramines because chlorine?
73.
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen.
74.
A pump shafts main function is to?
75.
The depression around the wall of the water surface caused by pumping water from the well is?
76.
What is the purpose of sodium thiosulfate in a water sample bottle?
77.
Venturi meters work on a?
78.
Who should be contacted to ensure proper disposal of water coming from the ground during trenching?
79.
The disinfection power of chlorine goes down as the pH decreases?
80.
What is the C-Value of a newly installed PVC pipe?
81.
What device serves the same function of the packing?
82.
Haloacetic Acids (haa5) are formed through?
83.
Pipe or Tank corrosion may be caused by?
84.
Anaerobic bacteria live?
85.
What is an example of Tier III violation.
86.
Dead end water mains should be flushed?
87.
The amount of power in watts required during a certain time period is?
88.
An illness in infants known as methemoglobinemia, or blue baby syndrome, is attributed to?
89.
Per Capita Water Use is?
91.
If an operator has a problem achieving adequate disinfection, a possible cause is?
92.
What is the MCLG for coliform bacteria?
93.
The cl2 residual in water may be determined by using the reagent?
94.
What is the minimum contact time when disinfecting water mains using the chlorine slug method?
95.
Sodium Hypochlorite comes in what form?
96.
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?
98.
What health effect category refers to an organic chemical that is a known carcinogen?
99.
What chemical decreases corrosion rates?
100.
How often should chlorine supply lines be replaced?
If there are any question or answer irregularities please email Contact@waternuggets.com Please remember questions are randomized, so specifics would be very helpful.
