Welcome to the 50 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
What valve should be used when it is needed to supply water to different pressure zones?
2.
All consumer water meters must test within what range of accuracy?
3.
Almost all methods used to aerate a reservoir include?
4.
What is the most common problem with a hypochlorinator?
5.
Friction in a pipe can cause?
7.
The outlet of a forced ventilation system for a chlorinator room she be located?
8.
In an excavation a ladder must be placed within how many feet of every person in the trench?
9.
Per Capita Water Use is?
10.
Pump rings can be classified as?
11.
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?
12.
What is the main reason for the poor accident record of operators?
13.
What provides a profile of hazardous mixtures and substances?
14.
What can be done to prevent cavitation form occurring?
15.
The chlorine room should be constructed so it can only be entered from?
16.
Chlorine gas is what color?
17.
Never apply water to a gaseous chlorine leak because the water will cause more issues.
18.
How often should pump bearings be re-greased?
19.
If an operator has a problem achieving adequate disinfection, a possible cause is?
20.
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?
21.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
22.
An approved backflow assembly that can be used to prevent backflow and backsiphonage is?
23.
Surge tanks in the water system are used for?
24.
What is the odor detection limit for chlorine gas?
25.
Public water systems using surface water must continuously monitor the disinfection residual entering the distribution system if serving more than?
26.
On a venturi meter the up or down stream pressure is compared to the pressure?
27.
The IDLH (immediately dangerous to life and health) value for chlorine is?
28.
What should be installed at a dead end water main?
29.
A connection between a potable water system and a non potable water system is?
30.
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen.
31.
The water level below the normal level that persists after a well pump has been off for a period of time is?
32.
When working in a confined space the oxygen level should never drop below?
33.
How long can samples being tested for coliforms be refrigerated before analysis?
34.
At what temperature will a fusible plug melt on a 150lb chlorine cylinder?
35.
A confined space is not designed for continuous occupancy and has limited means of entrance and exit.
36.
Opening the discharge valve one full turn on a chlorine cylinder will?
37.
What is the most common water complaint?
38.
To ease installation of impeller wear rings, they can be?
39.
The amount of oxygen that can remain dissolved in water is related to?
40.
Centrifugal force is generated?
41.
The powder substance in a Bac-T sample bottle is?
42.
To re-pack a burred gate valve, the valve must be
43.
What is the highest degree of backlfow protection?
44.
The difference between the amount of chlorine added to water and the chlorine residual remaining in the water after a given contact time is?
45.
A dry barrel fire hydrant is used to?
46.
What element is found in all acids?
47.
What corrosion inhibitor is most effective in control of lead in a distribution system?
48.
Packing glands on a pump should always?
49.
What is a closed fireline?
50.
A yellow fire hydrant body with a blue cap flows at?
