Welcome to the 100 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
Who should be contacted to ensure proper disposal of water coming from the ground during trenching?
2.
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?
3.
A connection between a potable water system and a non potable water system is?
4.
What conditions can cause a shoring system to fail?
5.
How often should you change the fusible plug on a 150lb chlorine cylinder?
6.
The operating valve for a wet barrel hydrant is located
7.
Notification to the public of a Tier III violation is done
8.
If a fire hydrant or cap is painted black this means?
9.
Chlorine gas is how many times denser than air?
10.
Thrust blocks are installed to?
11.
Chlorine gas is what color?
12.
The maximum chlorine withdraw rate from a 1 ton cylinder is?
13.
What type of valve dampens water hammer?
14.
What type of valve is used to control the level in a water tank?
15.
In an excavation a ladder must be placed within how many feet of every person in the trench?
16.
Black and Red stains on a consumer's plumbing could indicate that the source water has high levels of?
17.
A trench should generally be no more than how many feet wider than the diameter of the water main?
18.
The Safe Drinking Water Act defines a public water system that supplies piped water for human consumption as one that has...
19.
What are two ways to prevent freezing in a water storage tank?
20.
Milky water that clears in time from the bottom up is a possible indication of?
21.
What type of water meter is based on the Doppler effect?
22.
What is the only MCL that varies with the temperature?
23.
What is the odor detection limit for chlorine gas?
24.
What is the ideal indicator for pathogens in the drinking water supply?
25.
Chloramines are used?
26.
Thrust blocks are not required when?
27.
What chlorine concentration should be used to spray or paint disinfect the inside of a water storage tank?
28.
The lowest pressure point in a pump is?
29.
What type of joint is for steel piping?
30.
A fire hydrant that has a yellow body and a red cap represents
31.
A competent person must inspect excavations continuously while workers are in the excavation.
32.
How do you respond to a consumer who contacts you while you are repairing a water main?
33.
Surge tanks in the water system are used for?
34.
The minimum cover over a water service in a warm climate is?
35.
The most widely used type of prime mover in a pump station is?
36.
What percentage of the earth's surface is covered in water?
37.
Trihalomethanes (THM's) are primarily a concern in?
38.
Centrifugal force is generated?
39.
How are chloramines formed?
40.
What type of pressure sensor uses a wire attached to a diaphram?
41.
What reduces the water pressure down stream?
42.
What valve is the best for regulating flow?
43.
What is atmospheric pressure at sea level?
44.
What is the rule that sets MCL's for harmful chemicals?
46.
What water quality report must the water supplier provide to its consumers every year?
47.
If a bac-T sample comes back positive, the water supplier needs to?
48.
The disinfection action of chlorine as the water temperature increases will what?
49.
Class C fire involves?
50.
Push joints can be used if the pipe must be pushed at an angle?
51.
What can be used to control scaling, but can never be used to control corrosion?
52.
What is the minimum contact time when disinfecting water mains using the chlorine slug method?
53.
The type of water main pipe most appropriate for river crossings and rugged terrain is?
54.
What is one of the most important daily functions for a manager of a water distribution system?
55.
What type of joint has moderate deflection and the gaskets absorb vibration and pipe movement?
56.
What is the electronic standard range?
57.
When sampling for THM's, what percentage of samples must be taken at the furthest point in the distribution system?
58.
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?
59.
Pipe or Tank corrosion may be caused by?
60.
Chlorine gas expands?
61.
What is used on the outside joint space of a steel cylinder concrete in order to protect the joint rings from external corrosion?
62.
When did Congress enact the Safe Drinking Water Act?
63.
If a water main can not be installed at an adequate depth to prevent freezing, Styrofoam insolation board can be used to protect the water in the pipe from freezing. How far above the pipe does the Styrofoam insulation need to be installed?
64.
An autoclave will sterilize at
65.
What contributes to the creation of algae blooms?
66.
Hydropneumatic water systems
67.
Taste and odor complaints in the water system can be caused by?
68.
When flushing a water main in response to a water quality complaint, always flush at what velocity?
69.
Packing glands on a pump should always?
70.
Material Safety Data Sheets (MSDS) are required for?
71.
What type of pipe is plastic?
72.
What is the best mechanical compacting equipment for deep narrow trenches?
73.
To ease installation of impeller wear rings, they can be?
74.
When disinfecting water mains with tablets what should the concentration be and for how long?
75.
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?
76.
What is the difference between a Primary and a Secondary standard in drinking water?
77.
What term describes a measure of the capacity of water to neutralize a strong acid?
78.
According to OSHA, an atmosphere is oxygen deficient if it contains less than what percent of oxygen by volume?
79.
1 cubic foot of water =
80.
If a bac-T sample is positive, repeat samples must be taken
81.
An underground layer of water bearing permeable rock is?
82.
Most water systems used hydrants with two nozzles. What are the diameters of the two nozzles?
83.
On a venturi meter the up or down stream pressure is compared to the pressure?
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 is the MCLG for coliform bacteria?
86.
Friction in a pipe can cause?
87.
A possible cause of a complaint of cloudy water is?
88.
Opening the discharge valve one full turn on a chlorine cylinder will?
89.
What is the MCLG for lead in the drinking water?
90.
Why is it important to monitor the speed of a variable speed pump?
91.
Inspection of a pump shaft and coupling should be performed?
92.
What carcinogenic disinfection by product may be formed with chlorine is used to disinfect drinking water when organics are present?
93.
How many pounds of chlorine is capable of being withdrawn from a 150lb cylinder in a day?
94.
How many Milliliters (ml) are in 1 gallon of water?
95.
What should be determined first when designing a water pump station?
96.
What can be devolved by measuring the pressure along a pipeline?
97.
What is the unit of measurement used to express velocity in a water pipe?
98.
Pipe strength is expressed in?
99.
Records on turbidity analysis should be kept for a minimum of?
100.
What effect will algae in a reservoir have on dissolved oxygen?
If there are any question or answer irregularities please email Contact@waternuggets.com Please remember questions are randomized, so specifics would be very helpful.
