Welcome to the 50 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
Even during a fire event water pressure in a distribution system should never be allowed to drop below?
2.
The concentration of residual chlorine which is combined with ammonia and/or organic nitrogen in water as a chloramine and is still able to oxidize organic matter is called?
3.
What type of relay is mostly used to detect a power loss and initiate a switchover to another power source?
4.
Per Capita Water Use is?
5.
How much time does a water utility have to notify of a Tier I violation?
6.
What is the purpose of a vacuum regulator?
7.
Water meters that can register small flows as well as large flows are?
8.
When the discharge of a velocity pump is blocked, head builds up. Typically the head is greater than the pressure generated during pumping. When this occurs, water recirculates inside the pump impeller and casing. This condition is called?
9.
When working in a confined space the oxygen level should never drop below?
10.
The most widely used type of prime mover in a pump station is?
11.
What valve is used to dampen water hammer?
12.
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?
13.
What device serves the same function of the packing?
14.
1 cubic yard = cubic feet?
15.
Which is a pathogen found in water?
16.
Hard water scale is usually caused by?
17.
The minimum cover over a water service in a warm climate is?
18.
What device changes the alternating current to direct current by allowing the electric current to flow in one direction but blocks flow in the opposite direction?
19.
Trihalomethanes (THM's) are primarily a concern in?
20.
A water system should monitor the water source for?
21.
Where are the sampling points located for required sampling of natural radionuclides in a community water system?
22.
What tier violation has the most critical impact on human health and notification is immediate?
23.
Class D fire involves?
24.
Calcium hypochlorite comes in what form?
25.
Haloacetic Acids (haa5) are formed through?
27.
The proper emergency kit for a 150lb chlorine cylinder is?
28.
Chlorine gas is what color?
29.
What does MCLG stand for?
30.
What describes the discharge rate of a piston style pump?
31.
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen.
32.
The disinfection action of chlorine as the water temperature increases will what?
33.
The outlet of a forced ventilation system for a chlorinator room she be located?
34.
Records of turbidity analysis must be kept for at least?
35.
The sensors that respond to liquid pressure will perform poorly if what enters the sensor?
36.
What type of pipe joint is available in both bolted and boltless flexible pipe joint designs?
37.
A portable ladder must extend how many feet above the upper surface of an excavated trench?
38.
Shoring is required in any excavation that is?
39.
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?
40.
Water main cleaning methods include.
41.
The slope method to prevent trench cave ins require what slope ratio?
42.
The amount of energy in feet required to overcome resistance to flow in a pipe is called?
43.
A sample taken that represents the water at particular time and place is?
44.
What is the greatest problem for most water distribution shut off valves?
45.
What is the only acceptable breathing device to wear when handling chlorine leaks?
46.
What method(s) should be used to prevent cave-ins while digging or trenching?
47.
What type of algae would be most likely found in nutrient rich waters?
48.
Water high in nitrates can cause?
49.
In an excavation a ladder must be placed within how many feet of every person in the trench?
50.
To re-pack a burred gate valve, the valve must be
