Welcome to the 100 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
What is the steel specimen inserted into water mains to measure the corrosiveness of the water is?
2.
The first layer of backfill compaction that is required for a newly installed pipe should?
3.
When sampling for THM's, what percentage of samples must be taken at the furthest point in the distribution system?
4.
Coagulation occurs during the first
5.
Water loss between 10-15% is accepted due to leaks, hydrant water theft, failing water meters, and illegal connections.
6.
Even during a fire event water pressure in a distribution system should never be allowed to drop below?
7.
Which of the following is colorless, odorless, lighter than air, highly flammable, and sometimes called swamp gas?
8.
What is the greatest problem for most water distribution shut off valves?
9.
With permit entry confined spaces, who is responsible for terminating entries?
10.
An autoclave will sterilize at
11.
A major break in a water main can assist the distribution operator to
12.
What term describes a measure of the capacity of water to neutralize a strong acid?
13.
When PVC is stacked loose it should be stacked no higher than?
14.
What is a prescriptive water right?
15.
Why is it important to monitor the speed of a variable speed pump?
17.
What type of joint is available in both bolted and boltless flexible pipe joint desings?
19.
The fusible metal plugs on chlorine containers are designed to melt at what temperatures?
20.
What type of water main pipe has the highest maximum working pressure?
21.
What should be determined first when designing a water pump station?
22.
Push joints can be used if the pipe must be pushed at an angle?
23.
What is the odor detection limit for chlorine gas?
24.
Uncombined chlorine that remains in the water after chlorine has been applied and allowed to react is?
25.
What is the process used to test for leakage in pipes?
26.
What color will the DPD indicator powder turn water?
27.
If an employee is caught in a room where there is a chlorine gas leak and the employee does not have of on a mask, what should the employee do?
28.
What method(s) should be used to prevent cave-ins while digging or trenching?
29.
What is the recommended free chlorine residual for the furthest point in the water distribution system?
30.
An onsite sodium hypochlorite generation system creates liquid chlorine by combining?
31.
What is used on the outside joint space of a steel cylinder concrete in order to protect the joint rings from external corrosion?
32.
What type of valve is used to control the level in a water tank?
33.
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?
34.
When using Chlorine tablets to disinfect a pipeline during installation, the tablets should be placed where?
35.
All consumer water meters must test within what range of accuracy?
36.
What contributes to the creation of algae blooms?
38.
A portable ladder must extend how many feet above the upper surface of an excavated trench?
39.
Photosynthesis is a biochemical process in which
40.
Why are fire hydrants commonly color coded?
41.
Soil that is cohesive contains a lot of?
42.
Where are water meters usually installed?
43.
What is the most common problem with a hypochlorinator?
44.
Yellow hydrant body with an orange cap signals?
45.
If a water pump has sealed bearings, how often should they be lubricated?
46.
The fluoride concentration in drinking water is set in relation to?
47.
The more hydrogen ions
48.
What determines the minimum number of bacteriological samples that must be collected in a water distribution system?
49.
What tier violation has the most critical impact on human health and notification is immediate?
50.
How does OSHA define a competent person?
51.
What can be used to control scaling, but can never be used to control corrosion?
52.
Although velocity head can usually be ignored, it be considered when it is what percent of pressure head?
53.
What water quality report must the water supplier provide to its consumers every year?
54.
The ability of water to hold or contain dissolved oxygen (DO) is?
55.
The disinfection power of chlorine goes down as the pH decreases?
56.
What is a riparian water right?
57.
What is used as an indicator to determine possible contamination in the drinking water?
58.
What agency establishes drinking water standards in the United States of America?
59.
If a pump does not hold its prime, what could be wrong?
60.
Why would a zinc coating be applied to steel water pipes and water tanks?
61.
A dry barrel fire hydrant is used to?
62.
What is the National Primary Drinking Water Regulations MCL for total Hexavalent Chromium (Chromium 6)
64.
Algae in a water reservoir can cause?
65.
When employees are working in a trench that is 5' deep or more, that must have an adequate means of exit within 25' like?
66.
What chemical decreases corrosion rates?
67.
What type of pipe is plastic?
68.
What type of pipe will gas and oil permeate?
69.
When responding to a chlorine gas leak, the responder should have a SCBA and a?
70.
The chlorine demand to maintain a residual jumps from 0.9mg/L to 3.0mg/L. What does this indicate?
71.
What device changes the alternating current to direct current by allowing the electric current to flow in one direction but blocks flow in the opposite direction?
72.
Mechanical seals are most appropriate for pumps operating under what condition?
73.
What type of pipe joint permits flexible pipe alignment, is inexpensive to manufacture, and is easy to assemble?
74.
A competent person must inspect excavations continuously while workers are in the excavation.
75.
The AWWA recommends that 5/8" water meters be tested every?
76.
What carcinogenic disinfection by product may be formed with chlorine is used to disinfect drinking water when organics are present?
77.
Compressive fittings used with copper or plastic tubing seal by using?
78.
Water main cleaning methods include.
79.
Hard water scale is usually caused by?
80.
What valve can go from fully open to fully closed with 1/4 turn?
81.
What is the term for water samples collected at regular intervals and combined in equal volume with each other?
82.
What type of joint has moderate deflection and the gaskets absorb vibration and pipe movement?
83.
What is the rule that sets MCL's for harmful chemicals?
84.
When taking a water distribution sample for bacteriological testing, the water operator taking the water sample should?
85.
Spontaneous combustion can occur when chlorine is mixed with?
86.
The most widely used type of prime mover in a pump station is?
87.
What can be devolved by measuring the pressure along a pipeline?
88.
A fire hydrant that has a yellow body and a red cap represents
89.
The outlet of a forced ventilation system for a chlorinator room she be located?
90.
What gas can cause lung and skin irritation?
91.
What type of joint is for steel piping?
92.
What does a, "Hot Bacti" refer to?
93.
What is the minimum contact time when disinfecting water mains using the chlorine slug method?
94.
The Safe Drinking Water Act defines a public water system that supplies piped water for human consumption as one that has...
95.
If air is used to generate ozone, which percentage of the air is usually converted to ozone?
96.
Inspection of a pump shaft and coupling should be performed?
97.
What is the unit of measurement used to express velocity in a water pipe?
98.
How do you respond to a consumer who contacts you while you are repairing a water main?
99.
What are two ways to prevent freezing in a water storage tank?
100.
A connection between a potable water system and a non potable water system is?
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