Welcome to the 100 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
What type of sample should always be collected for determining the presence of coliform bacteria?
2.
According to OSHA, an atmosphere is oxygen deficient if it contains less than what percent of oxygen by volume?
3.
What type of joint is available in both bolted and boltless flexible pipe joint desings?
4.
Even during a fire event water pressure in a distribution system should never be allowed to drop below?
5.
When taking a water distribution sample for bacteriological testing, the water operator taking the water sample should?
6.
What type of pipe joint consists of two machined surfaces?
7.
Soil that is cohesive contains a lot of?
8.
What is lake stratification?
9.
The sensors that respond to liquid pressure will perform poorly if what enters the sensor?
10.
Records on turbidity analysis should be kept for a minimum of?
11.
What type of valve is used to control the level in a water tank?
12.
Push joints can be used if the pipe must be pushed at an angle?
13.
A pro of chloramines is?
14.
Newly installed water mains should be flushed
15.
What effects does manganese in the water have?
16.
A red hydrant cap or red fire hydrant means?
17.
A possible cause of a complaint of cloudy water is?
18.
What type of pipe joint is used in an area with hills or earthquakes to make sure joints do not sperate?
19.
What element is found in all acids?
20.
What type of water main is now banned from being installed in the drinking water industry?
21.
The more hydroxide ions
22.
What present in water will increase corrosion rates?
23.
How often should a ladder be placed in a trench?
24.
The fluoride concentration in drinking water is set in relation to?
25.
What is a prescriptive water right?
26.
If a water pump has sealed bearings, how often should they be lubricated?
27.
Acid should always be diluted into water.
28.
Head loss in a water distribution system depends on
29.
What is the purpose of sodium thiosulfate in a water sample bottle?
30.
In an excavation a ladder must be placed within how many feet of every person in the trench?
31.
A pump shafts main function is to?
32.
The minimum desired water pressure is?
33.
Bar screens are used to?
34.
What is the MCLG for lead in the drinking water?
35.
Chlorine gas is how many times denser than air?
36.
An autoclave will sterilize at
37.
Testing for individual pathogens would be very expensive. Instead, test for an indicator organism. What organism should be tested for?
38.
The amount of oxygen that can remain dissolved in water is related to?
39.
With permit entry confined spaces, who is responsible for terminating entries?
40.
The ability of water to hold or contain dissolved oxygen (DO) is?
41.
What is a closed fireline?
42.
Public water systems using surface water must continuously monitor the disinfection residual entering the distribution system if serving more than?
43.
The minimum cover over a water main below a road in a warm climate is?
44.
How often should pump bearings be re-greased?
45.
What type of water main pipe has the highest maximum working pressure?
46.
How high can a perfect vacuum lift water at sea level?
47.
What is the difference between a Primary and a Secondary standard in drinking water?
48.
What is the odor detection limit for chlorine gas?
49.
Identify which is a Cross-Connection hazard in a drinking water system.
50.
What kind of gas can cause lung and skin irritation?
51.
How much larger should the outside diameter be of casing pipe protecting large water mains?
52.
What does a, "Hot Bacti" refer to?
53.
If an operator gets sodium hypochlorite on their skin or in their eyes, immediately flush with water for how long?
54.
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?
55.
The amount of power in watts required during a certain time period is?
56.
What is the equation for Ohm's law?
57.
What is the MCLG for coliform bacteria?
58.
Which of the following is colorless, odorless, lighter than air, highly flammable, and sometimes called swamp gas?
59.
The minimum required free chlorine residual anywhere in the water distribution system is?
60.
Trihalomethanes (THM's) are primarily a concern in?
61.
When PVC is stacked loose it should be stacked no higher than?
62.
A ladder is required in all excavations that are greater than?
63.
Turbidity in the drinking water system can not exceed?
64.
What is the only MCL that varies with the temperature?
65.
Anaerobic bacteria live?
66.
The first layer of backfill compaction that is required for a newly installed pipe should?
67.
Interior copper tubing is usually joined by?
68.
Hydraulics is the study of?
69.
When a water main needs to be depressurized is must be what?
70.
What is the detention time for disinfecting a water storage tank with water mixed with hypochlorites and has a free chlorine of 10 mg/L?
71.
What valve can go from fully open to fully closed with 1/4 turn?
72.
Ball and socket joints can provide deflections up to?
73.
What is atmospheric pressure at sea level?
74.
Class B fire involves?
75.
Opening the discharge valve one full turn on a chlorine cylinder will?
76.
Shoring is required in any excavation that is?
77.
Why should a centrifugal pump never be run empty?
78.
If air is used to generate ozone, which percentage of the air is usually converted to ozone?
79.
All water system sampling site plans must be approved by?
80.
When did Congress enact the Safe Drinking Water Act?
82.
A water source that flows continuously at all times of the year is called?
83.
What type of water meter is based on the Doppler effect?
84.
Velocity of flow in water mains is usually expressed in?
85.
A pro of chloramines is?
86.
If a pump loses its prime because the suction line has an air pocket, the operator should?
87.
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?
88.
On a brand new pump, when should the first oil change be done?
89.
Sodium Hypochlorite comes in what form?
90.
What rule that sets MCL's for harmful chemicals?
91.
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?
92.
When using Chlorine tablets to disinfect a pipeline during installation, the tablets should be placed where?
93.
How often should you change the fusible plug on a 150lb chlorine cylinder?
94.
How long can samples being tested for coliforms be refrigerated before analysis?
96.
The IDLH (immediately dangerous to life and health) value for chlorine is?
97.
What is the appropriate angle for average soils when using the sloping method for the prevention of cave-ins? (Horizontal to Vertical Distance)
98.
When a bac-T sample is positive, repeat samples must be taken
99.
When a negative reading on the Langelier index is recorded the water is?
100.
Valve opening and closing is the main cause of hydraulic transient in a water distribution system.
If there are any question or answer irregularities please email Contact@waternuggets.com Please remember questions are randomized, so specifics would be very helpful.
