Welcome to the 50 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
Hydrogen Sulfide is a dangerous gas that has a rotten egg odor and can be deadly to a water operator. What should you do if you encounter the smell?
4.
What is the maximum theoretical suction lift of a centrifugal pump at sea level?
6.
The IDLH (immediately dangerous to life and health) value for chlorine is?
7.
According to OSHA, an atmosphere is oxygen deficient if it contains less than what percent of oxygen by volume?
8.
What two chemicals cause water hardness?
9.
When PVC is stacked loose it should be stacked no higher than?
10.
An onsite sodium hypochlorite generation system creates liquid chlorine by combining?
11.
When taking a water distribution sample for bacteriological testing, the water operator taking the water sample should?
12.
When did Congress enact the Safe Drinking Water Act?
13.
Black and Red stains on a consumer's plumbing could indicate that the source water has high levels of?
14.
What type of valve is used to control the level in a water tank?
15.
What valve should be used when it is needed to supply water to different pressure zones?
16.
What is the best mechanical compacting equipment for deep narrow trenches?
17.
On a venturi meter the up or down stream pressure is compared to the pressure?
18.
Shielding or a trench box must
19.
Records of chemical analyses should be kept for?
20.
If special bedding is required due to poor local soil conditions, the material should not contain granular material greater than?
21.
What element is found in all acids?
22.
The concentration of residual chlorine which is combined with ammonia and/or organic nitrogen in water as a chloramine and is still able to oxidize organic matter is called?
23.
Although velocity head can usually be ignored, it be considered when it is what percent of pressure head?
24.
What type of joint is available in both bolted and boltless flexible pipe joint desings?
25.
The operating valve for a wet barrel hydrant is located
26.
Where are the sampling points located for required sampling of natural radionuclides in a community water system?
27.
What is the only MCL that varies with the temperature?
28.
The chlorine room should be constructed so it can only be entered from?
29.
Where are the sampling points for required sampling of organic (except for THM's) in a community water system?
30.
In an excavation a ladder must be placed within how many feet of every person in the trench?
31.
The rated flow of a water meter, as stated by the manufacture, is based on
32.
When employees are working in a trench that is 5' deep or more, that must have an adequate means of exit within 25' like?
33.
What level of threshold odor number (TON) will result in a customer complaint?
34.
Total dynamic head against which a pump must operate is?
35.
Venturi meters are used for?
36.
Velocity of flow in water mains is usually expressed in?
37.
At what time of the day is the age of the water stored in the distribution system tanks the lowest?
38.
Yellow hydrant body with an orange cap signals?
39.
What type of polar bonds are between the hydrogen atoms and the oxygen atom in water?
40.
The cl2 residual in water may be determined by using the reagent?
41.
A reaction of certain organic compounds and free chlorine can form?
42.
Mechanical seals are most appropriate for pumps operating under what condition?
43.
What is the MCLG for lead in the drinking water?
44.
What is the volume of a bac-T sample (coliform sample)
45.
The depression around the wall of the water surface caused by pumping water from the well is?
46.
What contributes to the creation of algae blooms?
47.
Why should a centrifugal pump never be run empty?
48.
How much time does a water utility have to notify of a Tier I violation?
49.
Hydropneumatic water systems
50.
What type of relay is mostly used to detect a power loss and initiate a switchover to another power source?
