Welcome to the 100 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
The operating valve for a dry barrel fire hydrant is located?
2.
The type of water main pipe most appropriate for river crossings and rugged terrain is?
3.
Who may sign the confined space permit?
4.
Head loss in a water distribution system depends on
5.
If a water main can not be installed at an adequate depth to prevent freezing, Styrofoam insolation board can be used to protect the water in the pipe from freezing. How far above the pipe does the Styrofoam insulation need to be installed?
6.
What does hydrogen sulfide smell like?
7.
Taste and odor complaints in the water system can be caused by?
8.
Friction in a pipe can cause?
9.
Fire insurance underwriters recommend that no water main should have a diameter less than?
10.
Trihalomethanes (THM's) are primarily a concern in?
11.
If a pump does not hold its prime, what could be wrong?
12.
What can be devolved by measuring the pressure along a pipeline?
13.
What conditions can cause a shoring system to fail?
14.
Centrifugal force is generated?
15.
Mechanical seals on a centrifugal pump?
16.
What is the maximum theoretical suction lift of a centrifugal pump at sea level?
17.
What does DBP stand for?
18.
Most water systems used hydrants with two nozzles. What are the diameters of the two nozzles?
19.
1 cubic yard = cubic feet?
20.
What type of rigid coupling is easy to install and remove?
21.
Uncombined chlorine that remains in the water after chlorine has been applied and allowed to react is?
22.
Some phase imbalance will occur in any system, but it should not exceed?
23.
If a water system fails to collect their water distribution system samples, under which public notification tier would the water system fall under?
24.
What is the rule that sets MCL's for harmful chemicals?
25.
What type of oil should not be used to lubricate bearings because it forms acids as it begins to break down?
26.
The slope method to prevent trench cave ins require what slope ratio?
27.
What type of algae would be most likely found in nutrient rich waters?
28.
The minimum required free chlorine residual anywhere in the water distribution system is?
29.
A water source that flows continuously at all times of the year is called?
30.
A possible cause of a complaint of cloudy water is?
31.
What effects does manganese in the water have?
32.
When a bac-T sample is positive, repeat samples must be taken
33.
The number of monthly distribution system chlorines residual tests that are required to be taken are based on?
34.
On a brand new pump, when should the first oil change be done?
35.
Fire fighting will never cause low pressure and backsiphonage in the water distribution system.
36.
Sodium Hypochlorite comes in what form?
37.
When installing the regulator to a chlorine cylinder, the lead or fiber washer used to prevent leaked should be changed?
38.
If algae in the water source is clogging the filters of the water plant the most probable solution is to?
39.
How are chloramines formed?
41.
What two chemicals cause water hardness?
42.
If a bac-T sample is positive, repeat samples must be taken
43.
A portable ladder must extend how many feet above the upper surface of an excavated trench?
44.
The IDLH (immediately dangerous to life and health) value for chlorine is?
45.
The minimum cover over a water service in a warm climate is?
46.
A water system should monitor the water source for?
47.
If a lane on a road needs to be closed due to an excavation and the speed limit is 25mph, how many cones are required to divert traffic?
48.
What is the measure of a materials opposition to the flow of electrical current?
49.
What is a measure of a materials opposition to the flow of electric current?
50.
What element is found in all acids?
51.
How often should you change the fusible plug on a 150lb chlorine cylinder?
52.
The backfill material for a pipe installation should contain enough moisture for a thorough compaction?
53.
How often should a ladder be placed in a trench?
54.
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?
55.
A dry barrel fire hydrant is used to?
56.
On a venturi meter the up or down stream pressure is compared to the pressure?
57.
What is the appropriate angle for average soils when using the sloping method for the prevention of cave-ins? (Horizontal to Vertical Distance)
58.
A connection between a potable water system and a non potable water system is?
59.
You have a new gasoline powered diaphragm pump and are using heavy-duty spiral wire reinforced suction hose. What is the practical maximum height at which to set the pump above the water level?
60.
Notification to the public of a Tier III violation is done
61.
What provides a profile of hazardous mixtures and substances?
62.
Where are the sampling points for required sampling of organic (except for THM's) in a community water system?
63.
Records on turbidity analysis should be kept for a minimum of?
64.
If a water pump has sealed bearings, how often should they be lubricated?
65.
When disinfecting water mains with tablets what should the concentration be and for how long?
66.
Tier II violations do not pose an immediate threat to public health.
67.
What should be determined first when designing a water pump station?
68.
What valve can go from fully open to fully closed with 1/4 turn?
69.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
70.
What effect will algae in a reservoir have on dissolved oxygen?
71.
Hydraulics is the study of?
72.
What is the term used for the remaining free chlorine in a water system after the chlorine demand has been met?
73.
When employees are working in a trench that is 5' deep or more, that must have an adequate means of exit within 25' like?
74.
What are the action levels for lead and copper?
75.
What type of pipe joint is available in both bolted and boltless flexible pipe joint designs?
76.
The depression around the wall of the water surface caused by pumping water from the well is?
77.
A gallon jug filled with water weighs?
78.
The outlet of a forced ventilation system for a chlorinator room she be located?
79.
How is the capacity of a centrifugal pump related to the total head?
80.
Yellow hydrant body with an orange cap signals?
81.
The C factor, or carrying capacity of a pipe, is often reduced by?
82.
What can be done to prevent cavitation form occurring?
83.
Ball and socket joints can provide deflections up to?
84.
What is the minimum separation for an Air Gap?
85.
What is the ideal indicator for pathogens in the drinking water supply?
86.
A public water system that uses surface water or ground water under the influence of surface water and provides filtration treatment is required to report an active violation of the filtered water turbidity standard if any turbidity measurements collected during the month exceeded?
87.
Pipe or Tank corrosion may be caused by?
88.
When a negative reading on the Langelier index is recorded the water is?
89.
What valve is used to dampen water hammer?
90.
Water loss between 10-15% is accepted due to leaks, hydrant water theft, failing water meters, and illegal connections.
91.
What contributes to the creation of algae blooms?
92.
Testing for individual pathogens would be very expensive. Instead, test for an indicator organism. What organism should be tested for?
93.
Bar screens are used to?
94.
What is a riparian water right?
95.
What type of sample should always be collected for determining the presence of coliform bacteria?
96.
Which of these is a displacement meter, which measure flow by registering the number of times that the meter chamber is filled and empty?
97.
What is the only MCL that varies with the temperature?
98.
Pump rings can be classified as?
99.
What device serves the same function of the packing?
100.
What is the minimum velocity that a water main should be flushed?
If there are any question or answer irregularities please email Contact@waternuggets.com Please remember questions are randomized, so specifics would be very helpful.
