Welcome to the Water Distribution Operator Practice Test.
Choose the best possible answer to the question.
1.
If an operator has a problem achieving adequate disinfection, a possible cause is?
2.
Water high in nitrates can cause?
3.
What effects does manganese in the water have?
4.
What is the term for water samples collected at regular intervals and combined in equal volume with each other?
5.
Meters that work over a wide range of flows are known as?
6.
Water meters that can register small flows as well as large flows are?
7.
If a fire hydrant or cap is painted black this means?
8.
What is the MCLG for coliform bacteria?
9.
What is the maximum residual disinfectant level for chlorine?
10.
What present in water will increase corrosion rates?
11.
If air is used to generate ozone, which percentage of the air is usually converted to ozone?
12.
Velocity of flow in water mains is usually expressed in?
13.
The disinfection power of chlorine goes down as the pH decreases?
14.
Head loss in a water distribution system depends on
15.
Minimum required water pressure is?
16.
The arrangement of water pumps in parallel is typically used to?
17.
If a foot valve on a pump suction line fails, what will occur?
18.
What is a primary indicator of bearing failure on a water pump?
19.
What is the only acceptable breathing device to wear when handling chlorine leaks?
20.
Chlorine applied minus chlorine remaining is?
21.
What is the steel specimen inserted into water mains to measure the corrosiveness of the water is?
22.
What type of meter determines the total flow by multiplying the flow through the meter by a factor?
23.
What effect will caustic soda have on water?
24.
Most water systems used hydrants with two nozzles. What are the diameters of the two nozzles?
25.
How often should the temperature of the motor bearings of a centrifugal pump be checked with a thermometer?
