Welcome to the 50 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
What is the appropriate angle for average soils when using the sloping method for the prevention of cave-ins? (Horizontal to Vertical Distance)
2.
Atmospheric pressure is?
3.
Water tanks storing treated water should be?
4.
Most water systems used hydrants with two nozzles. What are the diameters of the two nozzles?
5.
Algae in a water reservoir can cause?
6.
A connection between a potable water system and a non potable water system is?
7.
What is the minimum velocity that a water main should be flushed?
8.
The minimum required free chlorine residual anywhere in the water distribution system is?
9.
A trench should generally be no more than how many feet wider than the diameter of the water main?
10.
What type of pipe requires special external protection in high-chloride soil?
11.
How many minutes are in a day?
12.
What is the recommended free chlorine residual for the furthest point in the water distribution system?
13.
Uncombined chlorine that remains in the water after chlorine has been applied and allowed to react is?
14.
What is the volume of a bac-T sample (coliform sample)
15.
What effects does manganese in the water have?
16.
What type of pipe joint lacks flexibility and is not normally burried?
17.
How many feet must a ladder extend above the trench?
18.
Identify which is a Cross-Connection hazard in a drinking water system.
19.
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?
20.
What conditions can cause a shoring system to fail?
21.
What is the MCL for THM's?
22.
What corrosion inhibitor is most effective in control of lead in a distribution system?
23.
How much deeper below the grade line of a pipe bottom should a trench be excavated if it is being dug in a rock formation?
24.
What type of joint is for steel piping?
25.
Lead contamination in drinking water may cause children to have altered physical and mental developments.
26.
Free chlorine residual values are based on contact time of at least?
27.
What can be done to prevent cavitation form occurring?
28.
When a water main needs to be depressurized is must be what?
29.
Sacrificial anodes are also known as?
30.
Some water storage tanks have aviation warning lights on them. The FAA regulations require the bulbs to be replaced before they reach what percentage of their normal life expectancy?
31.
What effect will algae in a reservoir have on dissolved oxygen?
32.
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?
33.
What valve is the best for regulating flow?
34.
Water loss between 10-15% is accepted due to leaks, hydrant water theft, failing water meters, and illegal connections.
35.
The maximum chlorine withdraw rate from a 1 ton cylinder is?
36.
Class D fire involves?
37.
All consumer water meters must test within what range of accuracy?
38.
Newly installed water mains should be flushed
39.
The outlet of a forced ventilation system for a chlorinator room she be located?
40.
Steel pipe can not corrode on the inside.
41.
Interior copper tubing is usually joined by?
42.
If two different metals like copper and iron pipe are joined together, this will cause?
43.
What type of valve is used to control the level in a water tank?
44.
What parts on a centrifugal pump restricts flow between the impeller discharge and suction areas?
45.
A ladder is required in all excavations that are greater than?
46.
What effect will caustic soda have on water?
47.
What does hydrogen sulfide smell like?
48.
What type of pipe joint is available in both bolted and boltless flexible pipe joint designs?
49.
What is the purpose of a vacuum regulator?
50.
Friction in a pipe can cause?
