4 Practice Problems for the Water Distribution Operator Certification Exam
If you’re getting ready to take the Water Distribution Operator Certification Exam, check out the following video that covers 4 test questions. It’s a fairly short video, but it contains helpful information that can be used as a study guide. The practice problems covered in this video are the type of questions you will see on the Water Distribution Operator Certification Exam. If you want more test questions after watching this video, check out this book that contains 300 test questions for the Water Distribution Operator Certification Exam.
Want to pass you exam? Enroll in this helpful online course: Water Distribution Operator Certification Classes
Here’s a summary of what’s covered in the video. The answers to the questions are at the bottom of this page.
TEST QUESTIONS
- At what depths is shoring required in a trench if it’s excavated in soil?
- 3 feet or deeper
- 4 feet or deeper
- 5 feet or deeper
- 6 feet or deeper
2. Which of the following is a positive displacement meter?
- Venturi meter
- Turbine meter
- Nutating disc meter
- Propeller meter
3. What does the C factor for a pipe represent?
- Strength of the pipe
- Flexibility of the pipe
- Thickness of the pipe
- Roughness of the pipe interior
4. What is used to locate a chlorine gas leak?
- Hydrogen peroxide
- Ammonia solution
- Sulfur
- Distilled water
ANSWERS:
-
C. (5 feet or deeper)
Shoring is a safety equipment that is installed in a trench to protect employees from a cave-in. It is required in a trench if it’s 5 feet or deeper, and excavated in soil.
In addition to shoring, you are allowed to use other alternatives to meet this requirement. For example, you can bench or slope the soil along the sides of the trench, or install a trench shield. On the Water Distribution Operator Certification Exam, you’ll most likely be tested on shoring than the other alternatives.
One thing to remember is that the 5-foot rule that I explained earlier only applies if the trench is excavated in soil. If it’s excavated in stable rock, then shoring or any of the alternatives is not required.
On the Water Distribution Operator Certification Exam, the test question on shoring may not clarify if trenching is in soil or stable rock. If you encounter this on the exam, you should assume that trenching is in soil because they’re testing you on the 5-foot rule.
Furthermore, the same applies with practice problems in study guides. Most of the time, the practice questions will not clarify if trenching is in soil or stable rock. Consequently, you should assume that trenching is in soil because they’re testing you on the 5-foot rule.
To learn more about trench safety, go to the textbook, Water Distribution System Operation and Maintenance, and on pages 91 to 97, it covers it in more detail.
2. C. (Nutating disc meter)
First of all, a nutating disc meter is a type of positive displacement meter that is commonly used for residential services to monitor water usage. So how does a nutating disc meter work?
When water fills the meter chamber, it causes the disc to nutate, which means to wobble. Every nutation corresponds to a fixed volume of water. So the total volume of water that passes through the meter can be determined by knowing the total number of nutations.
Now, let’s look at the nutating disc meter is more detail.
Every time water enters the chamber, it causes the disc to nutate. As a result, this causes the spindle at the top of the sphere, which is connected to the disc, to also nutate. By correlating this movement to the volume of water, the meter is able to register the total volume of water that passes through it.
To learn more about water meters, go to the textbook, Water Distribution System Operation and Maintenance, on pages 119 to 126, it covers it in more detail.
3. D. (Roughness of the pipe interior)
The C factor for a pipe represents the roughness of the pipe interior. For example, a new PVC pipe has a very smooth interior surface, which corresponds to a high C factor, such as 140 or even higher. In contrast, an older metallic pipe with tuberculation, which are small mounds of corrosion products, corresponds to a very low C factor, such as 100 or less.
In summary, the higher the C factor, the smoother the pipe. And the C factor tells you how rough or smooth the pipe interior is.
To learn more about C factors, go to the textbook, Water Distribution system Operation and Maintenance, on page 68, it covers it in more detail.
4. B. (Ammonia solution)
If you tie a rag on a stick, and dip the rag in ammonia solution and place it near a suspected leak, or spray ammonia solution vapor using a squeeze bottle near the suspected leak, the chlorine gas in the atmosphere will react with the ammonia solution vapor and create a white cloud. By tracing the white cloud, you’ll be able to locate the chlorine gas leak.
Additionally, another fact about chlorine gas that you should know is that if a chlorine gas cylinder is leaking, rotate it so that the leak is facing upwards. This will minimize the rate of the leak.
Also, remember that chlorine gas is 2.5 times heavier than air. This is one of the facts of chlorine gas that you should memorize before your Water Distribution Operator Certification Exam. It’s a fairly common test question.
To learn more about disinfectants, including chlorine gas, go to the textbook, Water Distribution System Operation and Maintenance, and on pages 282 to 331, it covers it in more detail.
CONCLUSION
In conclusion, if you want more test questions to prepare for the Water Distribution Operator Certification Exam, then check out this book, which contains 300 practice problems. It includes questions on both concepts and water math.
Moreover, if you need help studying for the exam, enroll in the following online course: Water Distribution Operator Certification Classes .
NEED ADDITIONAL HELP?
Lastly, if you need additional help, here are some more practice problems for you to study.