Page | 1
TCEQ CLASS B SURFACE WATER B TEST
MATERIAL –EXAM 2025 WITH 100% VERIFIED
QUESTIONS AND EXPERT SOLUTIONS
1. What Does The Texas Hazard Communication Act Require An Employer To Provide To
The Employees? - Correct Answer - The Texas Hazards Communication Act Requires
Employers To Provide Information And Training To Employees On The Hazards Of
Chemicals That They Use Or Work With.
2. An Employee Will Not Follow Safety Rules And Feels Like They Do Not Have To
Followed. What Should An Employer Do? - Correct Answer - Document Employee's
Actions And Counsel Employee. If He Does Not Respond Discharge Him.
3. What Is One Method Of Ensuring Safety In A Trench Or Excavation? - Correct Answer -
One Method Of Ensuring Safety And Health Of Workers In A Trench Or Excavation Is To
Slope The Sides Of The Cut To The "Angle Of Repose", Or The Angle Closet To The
Perpendicular At Which The Soil Will Remain At Rest Without Shoring. Angle Of Repose
Is Determined By Soil Type And Ditch Conditions.
4. What Is The Minimum Width For Any Ditch With Workers? - Correct Answer - The
Minimum Width For Any Ditch In Which Workers Must Work Is 18 Inches. A Ditch For
Water Main Construction Should Be At Least 12 Inches Wider Than The Outside Pipe
Diameter. Ditch Should Be As Narrow As Practical To Prevent Excessive Trench Load On
The Pipe. The Wider The Trench, The More Trench Load Is Placed On The Pipe.
5. What Causes Most Underground Pipe Failures? - Correct Answer - 90% Of Underground
Pipe Failures Are Related To Improper Backfill And Lack Of Proper Bedding.
6. An Operator Hears Pinging In The Pump. What Is Causing This? - Correct Answer -
, Page | 2
Cavitation, Caused By Formation And Collapse Of Bubbles In The Water Which Causes
Noise And Vibration. Pitting Of Metal May Result If Cavitation Is Not Eliminated.
7. What Does A Check Valve On The Pump Discharge Do? - Correct Answer - A Check
Valve On The Pump Discharge Of A Pump Prevents Back-Flow.
8. Customer Complains About Low Water Pressure. What Should Operator Do? - Correct
Answer - All Complaints Should Be Throughly Checked Out By A Representative Of The
Municipality Who Can Deal With The Public In A Calm And Dignified Manner. Some
Causes Of Low Water Pressure Are Clogged Screens On Faucets, A Lean Or Break In The
Area, Flushing Of Water Mains, Build Up In Pipes Or Meter, A Partially Closed Valve,
Heavy Water Use During Summer And Fire Rescue.
9. What Is The Quality Of Raw Water Affected By? - Correct Answer - The Quality Of Raw
Water In Any Geographic Locality Is Determined Primarily By Natural Factors Such As
Geology, Topography, And Climate In Each Locality.
10. What Is The Most Important Factor Affecting The Useful Life Of Service Lines? - Correct
Answer - It Is The Ability Of The Material To Resist Internal And External Corrosion
11. When Does Suction Head Exist? - Correct Answer - Suction Head Exists When The
Source Of Supply Is Above The Centerline Of The Pump.
12. What Is Net Positive Suction Head (Npsh) - Correct Answer - Npsh Is The Pressure Under
Which Water Enters The Eye Of The Impeller In A Centrifugal Pump. Insufficient Npsh Is
The Main Cause Of Pump Cavitation
13. Explain And Expand On Chlorine Dioxide (What It Reacts With, Oxidizes, Etc) - Correct
Answer - Chlorine Dioxide Is A Gas Used In Small Quantities To Disinfect Water. It Does
Not React With Organics To Form Thms And Haas. It Oxidizes Phenols, Manganese, Iron,
Sulfurous And Organic Compounds Which Aids In The Removal Of Tastes And Odors. It Is
A Very Effective Bactericide And A Superior Virocide. It Dies Not Combine With
, Page | 3
Ammonia. Chlorine Dioxide Mrdl Is .8 Mg/L And Monitoring Procedures Are The Same As
For Chlorine. The Chlorite Mcl Is .Q Mg/L And Must Be Monitored Daily.
14. What Is Texas Drinking Water Ph Requirements? - Correct Answer - The Texas Drinking
Water Requirements Require A Ph > 7.0 For The Water Treatment Plant Finished Water.
Epa Requires That Ph Analysis Be Preformed Within 15 Minutes Of The Sample Being
Caught.
15. How Does Ph Affect Chlorine Activity? - Correct Answer - When Chlorine Is Added To
Water It Forms Hypochlorous Acid (Hocl) And Hydrochloric Acid (Ocl). The
Hypochlorous Acid Is The Effective Disinfectant. At A Ph Of 4.0 There Is 100%
Hypochlorous Acid. At A Ph Of 11 There Is 100% Hypochlorite Ion. At A Ph Of 7, The
Hypochlorous Acid Is At About 80% And The Hypochlorite Ion Makes Up About 20% Of
The Chlorine Content. The Lower The Ph Is More Effective Chlorine Is Because You Have
More Hypochlorous Acid.
16. What Is Meant By Water Stability? - Correct Answer - Stable Water Is Defined As Water
That Will Neither Deposit Or Dissolve A Calcium Carbonate Film Or Scale. Since No Water
Is Stable Indefinitely, Chemical Treatment Of Water Usually Is Intended To Produce Water
That Is Slightly Scale Forming Without Being Liable To Cause Stoppages In Small Lines
And Services. Bayliss Curve Is The Simplest Determination Of Stability. The Langelier
Saturation Index Is Also Used.
17. What/How Are Above Ground Tanks And Piping Protected From Corrosion? - Correct
Answer - Corrosion Protection For Above Ground Tanks And Piping Is Prevented By:
Cathodic Protection, Use If Protective Linings/Coatings, Eliminating Different Types Of
Metals In The Distribution System, And Treating The Water With Chemicals To Make It
Less Corrosive
18. How Do You Tests Fir Alkalinity? - Correct Answer - The Two Tritiation Methods Of
Analysis Are A Standard Acid To Titrate A Sample. The End Point Of The Titration Is
Determined By The Following: An Indicator That Changes Color At A Certain Ph, Or
Potentiometric Titration To End - Point Ph. Using Either Of The Methods, A Measured
Amount Of Sample Is Titrated With A Standard Sulfuric Acid To A Predetermined Ph.
Nomograph Are A Graphical Form Of Determining Alkalinity. If The Ph, Total Alkalinity,
Temperature And Total Dissolved Solids Are Known, Any Or All Of The Alkalinity Forms
May Be Estimated.
, Page | 4
19. What Is Turbidity? - Correct Answer - Turbidity Can Be Described As A Measure Of The
Relative Clarity Of Water. Turbidity Is An Expression Of The Optical Property That Causes
Light To Be Scattered And Absorbed Rather Than Transmitted In Straight Lines Through
The Sample.
20. What Causes Turbidity? - Correct Answer - Turbidity Is Caused By Clay, Slit, Finely
Divided Organic And Inorganic Material. Other Suspended Matter And Microscopic
Organisms Can Also Cause Turbidity. There Is One Approved Method For Running
Turbidity - The Nephelometric Method (Ntu)
21. What Is Chlorine Demand? - Correct Answer - The Amount Of Chlorine Used Up To
Completely React With The Water And Its Suspended Or Dissolve Material
22. What Is Chlorine Residual? - Correct Answer - When All The Demand Of The Water Is
Met Any Additional Chlorine Produces A Chlorine Residual
23. What Is Chlorine Dosage? - Correct Answer - Demand Plus Residual Is The Chlorine
Dosage. Chlorine Dosage = Demand + Residual
24. What Determines Rate Of Disinfection? - Correct Answer - Chlorine Concentration
And Contact Time Determines The Rate And Degree Of Disinfection. If
Concentration Increases, The Time Can Be Reduced; If Concentration Is Reduced The
Time Must Be Increased.
25. How Does Temperature Effect Chlorine Effectiveness? - Correct Answer
- Chlorine Effectiveness Is Greater At Higher Temperatures, Up To The Point That Chlorine
Volatizes. At Low Temperature, Chlorine Is More Stable, But Disinfection Time Increases.
TCEQ CLASS B SURFACE WATER B TEST
MATERIAL –EXAM 2025 WITH 100% VERIFIED
QUESTIONS AND EXPERT SOLUTIONS
1. What Does The Texas Hazard Communication Act Require An Employer To Provide To
The Employees? - Correct Answer - The Texas Hazards Communication Act Requires
Employers To Provide Information And Training To Employees On The Hazards Of
Chemicals That They Use Or Work With.
2. An Employee Will Not Follow Safety Rules And Feels Like They Do Not Have To
Followed. What Should An Employer Do? - Correct Answer - Document Employee's
Actions And Counsel Employee. If He Does Not Respond Discharge Him.
3. What Is One Method Of Ensuring Safety In A Trench Or Excavation? - Correct Answer -
One Method Of Ensuring Safety And Health Of Workers In A Trench Or Excavation Is To
Slope The Sides Of The Cut To The "Angle Of Repose", Or The Angle Closet To The
Perpendicular At Which The Soil Will Remain At Rest Without Shoring. Angle Of Repose
Is Determined By Soil Type And Ditch Conditions.
4. What Is The Minimum Width For Any Ditch With Workers? - Correct Answer - The
Minimum Width For Any Ditch In Which Workers Must Work Is 18 Inches. A Ditch For
Water Main Construction Should Be At Least 12 Inches Wider Than The Outside Pipe
Diameter. Ditch Should Be As Narrow As Practical To Prevent Excessive Trench Load On
The Pipe. The Wider The Trench, The More Trench Load Is Placed On The Pipe.
5. What Causes Most Underground Pipe Failures? - Correct Answer - 90% Of Underground
Pipe Failures Are Related To Improper Backfill And Lack Of Proper Bedding.
6. An Operator Hears Pinging In The Pump. What Is Causing This? - Correct Answer -
, Page | 2
Cavitation, Caused By Formation And Collapse Of Bubbles In The Water Which Causes
Noise And Vibration. Pitting Of Metal May Result If Cavitation Is Not Eliminated.
7. What Does A Check Valve On The Pump Discharge Do? - Correct Answer - A Check
Valve On The Pump Discharge Of A Pump Prevents Back-Flow.
8. Customer Complains About Low Water Pressure. What Should Operator Do? - Correct
Answer - All Complaints Should Be Throughly Checked Out By A Representative Of The
Municipality Who Can Deal With The Public In A Calm And Dignified Manner. Some
Causes Of Low Water Pressure Are Clogged Screens On Faucets, A Lean Or Break In The
Area, Flushing Of Water Mains, Build Up In Pipes Or Meter, A Partially Closed Valve,
Heavy Water Use During Summer And Fire Rescue.
9. What Is The Quality Of Raw Water Affected By? - Correct Answer - The Quality Of Raw
Water In Any Geographic Locality Is Determined Primarily By Natural Factors Such As
Geology, Topography, And Climate In Each Locality.
10. What Is The Most Important Factor Affecting The Useful Life Of Service Lines? - Correct
Answer - It Is The Ability Of The Material To Resist Internal And External Corrosion
11. When Does Suction Head Exist? - Correct Answer - Suction Head Exists When The
Source Of Supply Is Above The Centerline Of The Pump.
12. What Is Net Positive Suction Head (Npsh) - Correct Answer - Npsh Is The Pressure Under
Which Water Enters The Eye Of The Impeller In A Centrifugal Pump. Insufficient Npsh Is
The Main Cause Of Pump Cavitation
13. Explain And Expand On Chlorine Dioxide (What It Reacts With, Oxidizes, Etc) - Correct
Answer - Chlorine Dioxide Is A Gas Used In Small Quantities To Disinfect Water. It Does
Not React With Organics To Form Thms And Haas. It Oxidizes Phenols, Manganese, Iron,
Sulfurous And Organic Compounds Which Aids In The Removal Of Tastes And Odors. It Is
A Very Effective Bactericide And A Superior Virocide. It Dies Not Combine With
, Page | 3
Ammonia. Chlorine Dioxide Mrdl Is .8 Mg/L And Monitoring Procedures Are The Same As
For Chlorine. The Chlorite Mcl Is .Q Mg/L And Must Be Monitored Daily.
14. What Is Texas Drinking Water Ph Requirements? - Correct Answer - The Texas Drinking
Water Requirements Require A Ph > 7.0 For The Water Treatment Plant Finished Water.
Epa Requires That Ph Analysis Be Preformed Within 15 Minutes Of The Sample Being
Caught.
15. How Does Ph Affect Chlorine Activity? - Correct Answer - When Chlorine Is Added To
Water It Forms Hypochlorous Acid (Hocl) And Hydrochloric Acid (Ocl). The
Hypochlorous Acid Is The Effective Disinfectant. At A Ph Of 4.0 There Is 100%
Hypochlorous Acid. At A Ph Of 11 There Is 100% Hypochlorite Ion. At A Ph Of 7, The
Hypochlorous Acid Is At About 80% And The Hypochlorite Ion Makes Up About 20% Of
The Chlorine Content. The Lower The Ph Is More Effective Chlorine Is Because You Have
More Hypochlorous Acid.
16. What Is Meant By Water Stability? - Correct Answer - Stable Water Is Defined As Water
That Will Neither Deposit Or Dissolve A Calcium Carbonate Film Or Scale. Since No Water
Is Stable Indefinitely, Chemical Treatment Of Water Usually Is Intended To Produce Water
That Is Slightly Scale Forming Without Being Liable To Cause Stoppages In Small Lines
And Services. Bayliss Curve Is The Simplest Determination Of Stability. The Langelier
Saturation Index Is Also Used.
17. What/How Are Above Ground Tanks And Piping Protected From Corrosion? - Correct
Answer - Corrosion Protection For Above Ground Tanks And Piping Is Prevented By:
Cathodic Protection, Use If Protective Linings/Coatings, Eliminating Different Types Of
Metals In The Distribution System, And Treating The Water With Chemicals To Make It
Less Corrosive
18. How Do You Tests Fir Alkalinity? - Correct Answer - The Two Tritiation Methods Of
Analysis Are A Standard Acid To Titrate A Sample. The End Point Of The Titration Is
Determined By The Following: An Indicator That Changes Color At A Certain Ph, Or
Potentiometric Titration To End - Point Ph. Using Either Of The Methods, A Measured
Amount Of Sample Is Titrated With A Standard Sulfuric Acid To A Predetermined Ph.
Nomograph Are A Graphical Form Of Determining Alkalinity. If The Ph, Total Alkalinity,
Temperature And Total Dissolved Solids Are Known, Any Or All Of The Alkalinity Forms
May Be Estimated.
, Page | 4
19. What Is Turbidity? - Correct Answer - Turbidity Can Be Described As A Measure Of The
Relative Clarity Of Water. Turbidity Is An Expression Of The Optical Property That Causes
Light To Be Scattered And Absorbed Rather Than Transmitted In Straight Lines Through
The Sample.
20. What Causes Turbidity? - Correct Answer - Turbidity Is Caused By Clay, Slit, Finely
Divided Organic And Inorganic Material. Other Suspended Matter And Microscopic
Organisms Can Also Cause Turbidity. There Is One Approved Method For Running
Turbidity - The Nephelometric Method (Ntu)
21. What Is Chlorine Demand? - Correct Answer - The Amount Of Chlorine Used Up To
Completely React With The Water And Its Suspended Or Dissolve Material
22. What Is Chlorine Residual? - Correct Answer - When All The Demand Of The Water Is
Met Any Additional Chlorine Produces A Chlorine Residual
23. What Is Chlorine Dosage? - Correct Answer - Demand Plus Residual Is The Chlorine
Dosage. Chlorine Dosage = Demand + Residual
24. What Determines Rate Of Disinfection? - Correct Answer - Chlorine Concentration
And Contact Time Determines The Rate And Degree Of Disinfection. If
Concentration Increases, The Time Can Be Reduced; If Concentration Is Reduced The
Time Must Be Increased.
25. How Does Temperature Effect Chlorine Effectiveness? - Correct Answer
- Chlorine Effectiveness Is Greater At Higher Temperatures, Up To The Point That Chlorine
Volatizes. At Low Temperature, Chlorine Is More Stable, But Disinfection Time Increases.
