Welcome to the 50 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
Public water systems using surface water must continuously monitor the disinfection residual entering the distribution system if serving more than?
2.
What type of pipe has the lowest normal maximum working pressure?
3.
What device serves the same function of the packing?
4.
What reduces the water pressure down stream?
5.
The total dynamic head at which a pump must operate at is the sum of the static head and the head due to friction loss.
6.
What type of water service line pipe material is no longer acceptable for drinking water?
7.
What type of pipe is plastic?
8.
Where should air vac/air release valves be located?
9.
1 cubic foot of water =
10.
Intestinal parasites that may be transmitted in water are?
11.
What is an example of Tier III violation.
12.
What should be installed at a dead end water main?
13.
Equipment that needs to be lubed in a water system setting should be lubed
14.
What does MCLG stand for?
15.
When entering a permitted confined space entry structure, always complete a permit and?
16.
The difference between the amount of chlorine added to water and the chlorine residual remaining in the water after a given contact time is?
17.
What valve is the best for regulating flow?
18.
What is the MCL for THM's?
19.
What is the appropriate angle for average soils when using the sloping method for the prevention of cave-ins? (Horizontal to Vertical Distance)
20.
What type of sample should always be collected for determining the presence of coliform bacteria?
21.
Records on bacterial analysis should be kept for a minimum of?
22.
With permit entry confined spaces, who is responsible for terminating entries?
23.
What does hydrogen sulfide smell like?
24.
What tier violation has the most critical impact on human health and notification is immediate?
25.
Who may sign the confined space permit?
26.
How does OSHA define a competent person?
27.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
28.
Aerobic bacteria live?
29.
If a bac-T sample comes back positive, the water supplier needs to?
30.
The slope method to prevent trench cave ins require what slope ratio?
31.
What is this and what is it used for?
32.
If a pump loses its prime because the suction line has an air pocket, the operator should?
33.
If an operator notices the bearings on a centrifugal pump are excessively hot, what is the most likely cause?
34.
What level of threshold odor number (TON) will result in a customer complaint?
35.
When a bac-T sample is positive, repeat samples must be taken
36.
What type of fire hydrant has no main valve, but has a separate valve for each nozzle?
37.
Where are water meters usually installed?
38.
Mechanical seals on a centrifugal pump?
39.
If a coupon loses weight what tendencies does the water have?
40.
The Surface Water Treatment Rule requires that disinfectant residuals be collected at the same location in the distribution system as?
41.
Define the term drawdown?
42.
Yellow hydrant body with an orange cap signals?
43.
Soil that is cohesive contains a lot of?
44.
When digging a trench to install or repair a water main, where does the soil go?
45.
What method(s) should be used to prevent cave-ins while digging or trenching?
46.
How many feet must a ladder extend above the trench?
47.
Per Capita Water Use is?
48.
Venturi meters work on a?
49.
Friction in a pipe can cause?
50.
What is the term for water samples collected at regular intervals and combined in equal volume with each other?
