Welcome to the Water Distribution Operator Practice Test.
Choose the best possible answer to the question.
1.
What corrosion inhibitor is most effective in control of lead in a distribution system?
2.
A trench should generally be no more than how many feet wider than the diameter of the water main?
3.
A possible cause of a complaint of cloudy water is?
4.
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?
5.
The chlorine room should be constructed so it can only be entered from?
6.
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?
7.
What type of pipe joint permits flexible pipe alignment, is inexpensive to manufacture, and is easy to assemble?
8.
A fire hydrant that has a yellow body and a red cap represents
9.
When did Congress enact the Safe Drinking Water Act?
10.
What should be installed at a dead end water main?
11.
The rated flow of a water meter, as stated by the manufacture, is based on
12.
What tier violation has the most critical impact on human health and notification is immediate?
13.
How often should chlorine supply lines be replaced?
14.
A sample taken that represents the water at particular time and place is?
15.
Friction head loss can be calculated using tables based on?
16.
Material Safety Data Sheets (MSDS) are required for?
17.
The backfill material for a pipe installation should contain enough moisture for a thorough compaction?
19.
The discharge rate of a piston type pump is?
20.
What is the MCLG for coliform bacteria?
21.
Packing glands on a pump should always?
22.
What is a closed fireline?
23.
What agency mandates the language and methods for public notification?
24.
Venturi meters are used for?
25.
How many feet must a ladder extend above the trench?
