Welcome to the 50 Question Water Distribution Practice Test.
Choose the best possible answer to the question.
1.
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?
2.
Mechanical seals are most appropriate for pumps operating under what condition?
3.
What type of rigid coupling is easy to install and remove?
4.
What type of pipe joint is used in an area with hills or earthquakes to make sure joints do not sperate?
5.
The minimum required free chlorine residual anywhere in the water distribution system is?
6.
The limnetic zone of a lake is?
7.
A dry barrel fire hydrant is used to?
8.
What is the best mechanical compacting equipment for deep narrow trenches?
9.
Water that requires a large amount of soap to get a lather is?
10.
The lowest layer in a reservoir is?
11.
Why should a centrifugal pump never be run empty?
12.
An underground layer of water bearing permeable rock is?
13.
Milky water that clears in time from the bottom up is a possible indication of?
14.
What type of polar bonds are between the hydrogen atoms and the oxygen atom in water?
15.
Uncombined chlorine that remains in the water after chlorine has been applied and allowed to react is?
16.
What device found in labs sterilizes by using pressurized steam?
17.
What is the equation for Ohm's law?
18.
What type of water meter is based on the Doppler effect?
19.
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?
20.
Where are the sampling points for required sampling of organic (except for THM's) in a community water system?
21.
The AWWA recommends that 5/8" water meters be tested every?
22.
What type of joint is for steel piping?
23.
What is the main reason for the poor accident record of operators?
24.
If a bac-T sample is positive, repeat samples must be taken
25.
The backfill material for a pipe installation should contain enough moisture for a thorough compaction?
26.
The number of monthly distribution system chlorines residual tests that are required to be taken are based on?
27.
A water system should monitor the water source for?
28.
What are the action levels for lead and copper?
29.
Some phase imbalance will occur in any system, but it should not exceed?
30.
The frequent starting of distribution pumps is a possible indication of?
31.
All water system sampling site plans must be approved by?
32.
A 1 ton cylinder filled with chlorine weighs approximately?
33.
How is the capacity of a centrifugal pump related to the total head?
34.
The disinfection power of chlorine goes down as the pH decreases?
35.
What is the most common problem with a hypochlorinator?
36.
What are the areas within a traffic zone?
38.
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?
39.
Meters that work over a wide range of flows are known as?
40.
What type of joint is available in both bolted and boltless flexible pipe joint desings?
41.
A pro of chloramines is?
42.
How often should you change the fusible plug on a 150lb chlorine cylinder?
43.
How do you respond to a consumer who contacts you while you are repairing a water main?
44.
How much time does a water utility have to notify of a Tier I violation?
45.
Intestinal parasites that may be transmitted in water are?
46.
The first layer of backfill compaction that is required for a newly installed pipe should?
47.
What is the typical strength of calcium hypochlorite?
48.
How many times heavier than air is chlorine gas?
49.
A red hydrant cap or red fire hydrant means?
50.
One of the reasons to choose chloramines as a disinfectant is in order to
