Welcome to the 50 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
What is the MCL for coliform bacteria?
2.
Where should air vac/air release valves be located?
3.
An autoclave will sterilize at
4.
When gas chlorinators operate at a high rate of withdrawal, what may happen?
5.
A water sample should be analyzed for a chlorine residual immediately, but if not the operator can analyze the sample for a chlorine residual within?
6.
What type of pipe has the lowest normal maximum working pressure?
7.
Total dynamic head against which a pump must operate is?
8.
What parts on a centrifugal pump restricts flow between the impeller discharge and suction areas?
9.
What type of valve is used to control the level in a water tank?
10.
Records on bacterial analysis should be kept for a minimum of?
11.
What percentage of the earth's surface is covered in water?
12.
Tier II violations do not pose an immediate threat to public health.
13.
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?
14.
1 cubic foot of water =
15.
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?
16.
A reaction of certain organic compounds and free chlorine can form?
17.
A public water system that uses surface water or ground water under the influence of surface water and provides filtration treatment is required to report an active violation of the filtered water turbidity standard if any turbidity measurements collected during the month exceeded?
18.
What type of joint is for steel piping?
19.
Class D fire involves?
20.
Yellow hydrant body with an orange cap signals?
21.
What is the maximum theoretical suction lift of a centrifugal pump at sea level?
22.
Mechanical seals on a centrifugal pump?
23.
What method(s) should be used to prevent cave-ins while digging or trenching?
24.
When a water main needs to be depressurized is must be what?
25.
The outlet of a forced ventilation system for a chlorinator room she be located?
26.
What type of water main pipe has the highest maximum working pressure?
27.
When taking a water distribution sample for bacteriological testing, the water operator taking the water sample should?
28.
Chlorine gas is how many times denser than air?
29.
What is the highest degree of backlfow protection?
30.
The first layer of backfill compaction that is required for a newly installed pipe should?
31.
Yellow hydrant body with an orange cap signals?
32.
The middle layer is a reservoir is?
33.
If air is used to generate ozone, which percentage of the air is usually converted to ozone?
34.
All water system sampling site plans must be approved by?
35.
Records of turbidity analysis must be kept for at least?
36.
To ease installation of impeller wear rings, they can be?
37.
Class B fire involves?
38.
What agency establishes drinking water standards in the United States of America?
40.
If an operator has a problem achieving adequate disinfection, a possible cause is?
41.
Yellow hydrant body with an orange cap signals?
42.
The more hydroxide ions
43.
Thrust blocks are not required when?
44.
The fluoride concentration in drinking water is set in relation to?
45.
What are the action levels for lead and copper?
46.
If a water system collects at least 40 samples per month for total coliform analysis, what the is the acceptable percentage of samples that can come back positive?
47.
How many feet must a ladder extend above the trench?
48.
Coagulation occurs during the first
49.
Water taste and odor complaints can come from
50.
What carcinogenic disinfection by product may be formed with chlorine is used to disinfect drinking water when organics are present?
