Welcome to the Water Distribution Operator Practice Test.
Choose the best possible answer to the question.
1.
The two types of pump seals are?
2.
The frequent starting of distribution pumps is a possible indication of?
3.
When installing the regulator to a chlorine cylinder, the lead or fiber washer used to prevent leaked should be changed?
4.
When a bac-T sample is positive, repeat samples must be taken
5.
What organisms have the greatest resistance to chlorine?
6.
At what time of the day is the age of the water stored in the distribution system tanks the lowest?
7.
Most water systems used hydrants with two nozzles. What are the diameters of the two nozzles?
8.
Records on turbidity analysis should be kept for a minimum of?
9.
Even during a fire event water pressure in a distribution system should never be allowed to drop below?
10.
Chlorine applied minus chlorine remaining is?
11.
Newly installed water mains should be flushed
12.
The EPA recommends water systems using surface water to collect samples for hexavalent chromium (chromium-6) on what basis?
13.
The outlet of a forced ventilation system for a chlorinator room she be located?
14.
What thrust control is easy to use, especially in locations where existing utilities or structures are numerous?
15.
How many times heavier than air is chlorine gas?
16.
Tier II violations do not pose an immediate threat to public health.
17.
The AWWA recommends that 5/8" water meters be tested every?
18.
In an excavation a ladder must be placed within how many feet of every person in the trench?
19.
What is the minimum contact time when disinfecting water mains using the chlorine slug method?
20.
Where are the sampling points located for required sampling of natural radionuclides in a community water system?
21.
Calcium hypochlorite comes in what form?
22.
If a water pump has sealed bearings, how often should they be lubricated?
23.
The profundal zone of a lake is?
24.
A heavy growth of algae in a reservoir will have what affect on the water during the day time?
25.
What is the most common water complaint?
