Welcome to the 50 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
In an excavation a ladder must be placed within how many feet of every person in the trench?
2.
How many Milliliters (ml) are in 1 gallon of water?
3.
Water filters in the water treatment processes are primarily used for removing or reducing?
4.
What color will the DPD indicator powder turn water?
5.
What is the sample size for lead and copper analysis?
6.
Per Capita Water Use is?
7.
What is the maximum residual disinfectant level for chlorine?
8.
Water meters that can register small flows as well as large flows are?
9.
Mechanical seals on a centrifugal pump?
10.
Compressive fittings used with copper or plastic tubing seal by using?
11.
The difference between the amount of chlorine added to water and the chlorine residual remaining in the water after a given contact time is?
12.
The Total Coliform Rule is based on?
13.
Total dynamic head against which a pump must operate is?
14.
The disinfection power of chlorine goes down as the pH decreases?
15.
The middle layer is a reservoir is?
16.
What type of pipe joint is used in an area with hills or earthquakes to make sure joints do not sperate?
17.
A pro of chloramines is?
18.
The rated flow of a water meter, as stated by the manufacture, is based on
19.
An underground geological water bearing formation is?
20.
What valve is the best for regulating flow?
21.
Permit required confined space entry requires a chest or full body harness and a retrieval line.
22.
What type of self-contained breathing apparatus should be used at water plants?
23.
What type of meter determines the total flow by multiplying the flow through the meter by a factor?
24.
You have a new gasoline powered diaphragm pump and are using heavy-duty spiral wire reinforced suction hose. What is the practical maximum height at which to set the pump above the water level?
25.
A red hydrant cap or red fire hydrant means?
26.
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?
27.
What does hydrogen sulfide smell like?
28.
What is the recommended free chlorine residual for the furthest point in the water distribution system?
29.
What carcinogenic disinfection by product may be formed with chlorine is used to disinfect drinking water when organics are present?
30.
Why would a zinc coating be applied to steel water pipes and water tanks?
31.
Where do good public relations start for any water district?
32.
What type of fires involve energized electrical equipment such as starters, breakers, and motors?
33.
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?
34.
What should be installed between a water main and a fire hydrant?
35.
The minimum desired water pressure is?
36.
What kind of gas can cause lung and skin irritation?
37.
Hard water scale is usually caused by?
38.
A split case pump has three impellers. What type of multi stage pump is that?
39.
Water contaminated with Haloacetic Acids (haa5) may cause?
40.
What is used as an indicator to determine possible contamination in the drinking water?
41.
Chlorine gas is what color?
42.
Taste and odor complaints in the water system can be caused by?
43.
When the discharge of a velocity pump is blocked, head builds up. Typically the head is greater than the pressure generated during pumping. When this occurs, water recirculates inside the pump impeller and casing. This condition is called?
44.
If a bac-T sample comes back positive, the water supplier needs to?
45.
Lead contamination in drinking water may cause children to have altered physical and mental developments.
46.
1 cubic yard = cubic feet?
47.
When installing the regulator to a chlorine cylinder, the lead or fiber washer used to prevent leaked should be changed?
48.
The fluoride concentration in drinking water is set in relation to?
49.
What is the highest degree of backlfow protection?
50.
If a bac-T sample is positive, repeat samples must be taken
