Class C Water Operator License Exam Flashcards
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Class C Water Operator License Exam Flashcards

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Questions and Answers

What does ammonia mixed with chlorine gas create?

white smoke

What is the most difficult part of a water distribution operator's job?

furnish a continuous supply

What is the term for a physical connection between a safe and potentially unsafe water source?

cross connection

What type of system is a distribution system?

<p>looped system</p> Signup and view all the answers

How often should dead end mains be flushed?

<p>every month</p> Signup and view all the answers

What condition is caused by excess nitrate?

<p>blue baby syndrome</p> Signup and view all the answers

What causes water hardness?

<p>calcium and magnesium</p> Signup and view all the answers

Sewer mains should be ___ ft away from water mains.

<p>9</p> Signup and view all the answers

What is the pH level of water considered acidic?

<p>less than 7</p> Signup and view all the answers

Bacti records are kept for ___ yrs and chemical records are kept for ___ yrs.

<p>5, 10</p> Signup and view all the answers

Bacti samples have to be returned to the lab within ___ hrs of the collection time.

<p>30</p> Signup and view all the answers

Color in the water supply should be less than ____ units.

<p>15</p> Signup and view all the answers

Chlorine is ______ times heavier than air.

<p>2.5</p> Signup and view all the answers

What percentage of underground pipe failures are related to improper backfill and bedding?

<p>90%</p> Signup and view all the answers

The spoil bank should be located at least ___ ft away from the ditch.

<p>2</p> Signup and view all the answers

The following minimum residuals are ______ mg/L for free chlorine and ____ mg/L for total chlorine.

<p>2, .5</p> Signup and view all the answers

Public opinion of the water utility is ______ at a standstill.

<p>never</p> Signup and view all the answers

A bacti sample should be taken every ____ ft of pipe.

<p>1000</p> Signup and view all the answers

What is the most common collection point for a bacti sample?

<p>outside the house</p> Signup and view all the answers

A standpipe is considered ground storage unless it exceeds _____ ft above the highest ______.

<p>80, service connection</p> Signup and view all the answers

________ protection is the electrochemical method for preventing ________ of metal tanks.

<p>cathodic, corrosion</p> Signup and view all the answers

The _____ is the only cross connection control method approved by _______.

<p>air gap, tceq</p> Signup and view all the answers

_______ on a pipeline depend on the _____ or coefficient of pipe roughness.

<p>friction loss, c factor</p> Signup and view all the answers

__________ occurs whenever there is a ______ in the velocity or direction of water flow.

<p>water hammer, sudden change</p> Signup and view all the answers

The ______ water pressure required by the rules and regulations is ____ psi under any and all conditions.

<p>minimum, 20</p> Signup and view all the answers

100, 150, 200 and 250 are approved classes of _____ ___.

<p>working pressure = Approved working pressure classes for pipes</p> Signup and view all the answers

What is used to anchor pipe bends?

<p>concrete</p> Signup and view all the answers

What is a general deposit of mineral particles evenly along the inside of the pipe?

<p>tuberculation</p> Signup and view all the answers

Shoring should be used if a ditch is ___ ft or deeper.

<p>5</p> Signup and view all the answers

What type of monitoring requires a written sample writing plan?

<p>coliform</p> Signup and view all the answers

Ladders should be placed every ___ ft in a ditch.

<p>25</p> Signup and view all the answers

An oxygen deficient atmosphere is defined as one which contains _____ than ______ % oxygen.

<p>less, 19.5</p> Signup and view all the answers

What happens to the discharge as the head increases in a centrifugal pump?

<p>decreases</p> Signup and view all the answers

The operator should leave a ________ of slack in flexible tubing.

<p>gooseneck</p> Signup and view all the answers

What is the most common type of water meter?

<p>positive displacement</p> Signup and view all the answers

Safe withdrawal weight from a 150 lb cylinder is ___ lbs and 400 lbs from a ____ ton cylinder.

<p>40, 1</p> Signup and view all the answers

What is the most common valve used?

<p>gate valve</p> Signup and view all the answers

What is the most commonly used fire hydrant in distribution systems?

<p>dry barrel</p> Signup and view all the answers

What feature do hydrants have in case they are struck by a vehicle?

<p>breakaway</p> Signup and view all the answers

Controlling valves regulate pressure flow ____ and flow _______.

<p>rates, direction</p> Signup and view all the answers

Study Notes

Water Operator License Exam Notes

  • Ammonia and chlorine gas react to create white smoke, a significant safety concern.
  • A primary challenge for water distribution operators is ensuring a continuous supply of water.
  • Cross connection refers to the physical link between a safe water source and one that may be unsafe, necessitating strict control measures.
  • A distribution system is typically designed as a looped system, enhancing water flow and pressure maintenance.
  • Dead end mains require flushing every month to prevent stagnation and contamination.
  • Excessive nitrate levels in water can lead to blue baby syndrome, a serious health issue.
  • Hardness in water is mainly due to the presence of calcium and magnesium ions.
  • Sewer mains must be at least 9 feet away from water mains to prevent contamination.
  • Water with a pH below 7 is classified as acidic, which can affect plumbing and water distribution systems.
  • Bacteriological (bacti) records are maintained for 5 years, while chemical records are held for 10 years.
  • Bacti samples should reach the lab within 30 hours post-collection to ensure accurate results.
  • Acceptable color in water supplies should not exceed 15 units, indicating water quality.
  • Chlorine gas is 2.5 times denser than air, making it a hazardous material in water treatment.
  • About 90% of underground pipe failures stem from improper backfill and bedding during installation.
  • Spoil banks from excavations should be placed at least 2 feet away from the ditch to avoid collapse.
  • Minimum residuals for free chlorine is 2 mg/L and total chlorine is 0.5 mg/L, crucial for disinfection.
  • Public perception of water utilities is ever-changing and cannot remain stagnant.
  • Bacti samples are required every 1000 feet of pipe to monitor water safety.
  • The common point for gathering a bacti sample is a water tap located outside a house.
  • A standpipe is deemed as ground storage unless it exceeds 80 feet above the highest service connection.
  • Cathodic protection is an electrochemical approach designed to prevent corrosion in metal tanks.
  • An air gap is the sole cross connection control method recognized by TCEQ (Texas Commission on Environmental Quality).
  • Friction loss in pipelines is determined by the coefficient of pipe roughness, known as the C factor.
  • Water hammer is a phenomenon resulting from sudden changes in water flow velocity or direction, which can damage infrastructure.
  • Regulations require a minimum water pressure of 20 psi under all conditions to ensure safe delivery.
  • Approved working pressure classes for water systems are 100, 150, 200, and 250 psi.
  • Concrete is typically used to anchor bends in piping systems.
  • Tuberculation refers to the even distribution of mineral deposits inside the pipes, which can affect water quality.
  • Shoring is required for ditches that are deeper than 5 feet to ensure worker safety during maintenance.
  • A written sampling plan is mandated for coliform monitoring, ensuring compliance with health standards.
  • Ladders should be installed every 25 feet in deep ditches for safe access.
  • An atmosphere is considered oxygen deficient if it contains less than 19.5% oxygen, which poses safety risks.
  • In centrifugal pumps, as the head increases, the discharge decreases, a fundamental principle in pump operation.
  • Operators should allow a gooseneck of slack in flexible tubing to accommodate movement and prevent breaks.
  • Positive displacement meters are the most frequently used type of water meters in residential and commercial use.
  • Safe withdrawal from a 150 lb gas cylinder is limited to 40 lbs, while up to 400 lbs can be taken from a 1-ton cylinder.
  • Gate valves remain the most common type of valve used within water distribution systems, providing efficient flow control.
  • Dry barrel hydrants are the standard type used in water distribution systems for firefighting.
  • Breakaway points on hydrants allow them to detach upon impact, minimizing damage and maintaining functionality.
  • Control valves play a critical role in regulating both pressure flow rates and the direction of water movement through the system.
  • Electricity is favored as a power source for distribution systems due to its reliability and efficiency in operation.

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Prepare for the Class C Water Operator License Exam with these essential flashcards. Each card covers key terms and definitions crucial for understanding water distribution and safety protocols. Enhance your study routine and boost your confidence before the exam.

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