Welcome to the 25 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
What can be used to control scaling, but can never be used to control corrosion?
2.
If air is used to generate ozone, which percentage of the air is usually converted to ozone?
3.
The lowest layer in a reservoir is?
4.
What two chemicals cause water hardness?
5.
If an operator has a problem achieving adequate disinfection, a possible cause is?
6.
How often should a ladder be placed in a trench?
7.
If special bedding is required due to poor local soil conditions, the material should not contain granular material greater than?
8.
If only two rings of packing are used in the stuffing box, the joints should be?
9.
What tier violation has the most critical impact on human health and notification is immediate?
10.
The EPA recommends water systems using surface water to collect samples for hexavalent chromium (chromium-6) on what basis?
11.
What element is found in all acids?
12.
What effects does manganese in the water have?
13.
What is the odor detection limit for chlorine gas?
14.
Trihalomethanes (THM's) are primarily a concern in?
15.
The Total Coliform Rule is based on?
16.
Which is a pathogen found in water?
17.
How many pounds of chlorine is capable of being withdrawn from a 150lb cylinder in a day?
18.
What is applied to electrodes placed in the water of a water storage tank?
19.
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?
20.
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?
21.
A detailed map of the entire distribution system is?
22.
Taste and odor complaints in the water system can be caused by?
23.
The ISO recommends that non-looped water mains connected to fire hydrants have a diameter of at least?
24.
Water loss between 10-15% is accepted due to leaks, hydrant water theft, failing water meters, and illegal connections.
25.
If a water storage tank is located far from the water system, what type of problem during peak demand would the water system probably have?
