TCEQ Class B Surface Water
B test Material Exam |
Exam Questions with
Correct Detailed Answers |
Latest Update 2024-2025
QUESTION; What is a standard solution? - ANSWER-A standard solution is a
solution of known strength or concentration.
QUESTION; What is concentration? - ANSWER-Concentration is the relationship
between the amount of solute in a solution.
QUESTION; At what frequency should you test your water system for radiation? -
ANSWER-Every 4 years
QUESTION;What is the most important factor affecting the useful life of service
lines? - ANSWER-It is the ability of the material to resist internal and external
corrosion
QUESTION; When does Suction Head exist? - ANSWER-Suction head exists when
the source of supply is above the centerline of the pump.
,QUESTION; What is Net positive Suction Head (NPSH) - 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
QUESTION; Explain and expand on Chlorine Dioxide (what it reacts with, oxidizes,
etc) - 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 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.
QUESTION; What is texas drinking water pH requirements? - 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.
QUESTION; How does pH affect Chlorine activity? - 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.
QUESTION; What is meant by water stability? - 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.
QUESTION; What/how are above ground tanks and piping protected from
corrosion? - 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
QUESTION; How do you tests fir alkalinity? - 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.
QUESTION; What is Turbidity? - 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.
QUESTION; What causes Turbidity? - 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)
QUESTION; What is chlorine Demand? - ANSWER-The amount of chlorine used up
to completely react with the water and its suspended or dissolve material
, QUESTION; What is chlorine residual? - ANSWER-When all the demand of the
water is met any additional chlorine produces a chlorine residual
QUESTION; What is chlorine dosage? - ANSWER-Demand plus residual is the
chlorine dosage. Chlorine Dosage = Demand + Residual
QUESTION; What determines rate of disinfection? - 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.
QUESTION; How does temperature effect chlorine effectiveness? - 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.
QUESTION; Is removing turbidity important for disinfection? - ANSWER-Turbidity
must be removed to low levels by sedimentation and filtration to allow chlorine to
contact pathogens.
QUESTION; What happens to dissolved solids on contact with chlorine? -
ANSWER-Dissolved solids are oxidized on contact further reinforcing the
importance of contact time.
QUESTION; No residual is formed until reducing agents are destroyed. What are
examples of reducing agents? - ANSWER-Manganese, iron, turbidity, organic
matter, ammonia, or nitrates
B test Material Exam |
Exam Questions with
Correct Detailed Answers |
Latest Update 2024-2025
QUESTION; What is a standard solution? - ANSWER-A standard solution is a
solution of known strength or concentration.
QUESTION; What is concentration? - ANSWER-Concentration is the relationship
between the amount of solute in a solution.
QUESTION; At what frequency should you test your water system for radiation? -
ANSWER-Every 4 years
QUESTION;What is the most important factor affecting the useful life of service
lines? - ANSWER-It is the ability of the material to resist internal and external
corrosion
QUESTION; When does Suction Head exist? - ANSWER-Suction head exists when
the source of supply is above the centerline of the pump.
,QUESTION; What is Net positive Suction Head (NPSH) - 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
QUESTION; Explain and expand on Chlorine Dioxide (what it reacts with, oxidizes,
etc) - 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 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.
QUESTION; What is texas drinking water pH requirements? - 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.
QUESTION; How does pH affect Chlorine activity? - 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.
QUESTION; What is meant by water stability? - 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.
QUESTION; What/how are above ground tanks and piping protected from
corrosion? - 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
QUESTION; How do you tests fir alkalinity? - 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.
QUESTION; What is Turbidity? - 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.
QUESTION; What causes Turbidity? - 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)
QUESTION; What is chlorine Demand? - ANSWER-The amount of chlorine used up
to completely react with the water and its suspended or dissolve material
, QUESTION; What is chlorine residual? - ANSWER-When all the demand of the
water is met any additional chlorine produces a chlorine residual
QUESTION; What is chlorine dosage? - ANSWER-Demand plus residual is the
chlorine dosage. Chlorine Dosage = Demand + Residual
QUESTION; What determines rate of disinfection? - 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.
QUESTION; How does temperature effect chlorine effectiveness? - 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.
QUESTION; Is removing turbidity important for disinfection? - ANSWER-Turbidity
must be removed to low levels by sedimentation and filtration to allow chlorine to
contact pathogens.
QUESTION; What happens to dissolved solids on contact with chlorine? -
ANSWER-Dissolved solids are oxidized on contact further reinforcing the
importance of contact time.
QUESTION; No residual is formed until reducing agents are destroyed. What are
examples of reducing agents? - ANSWER-Manganese, iron, turbidity, organic
matter, ammonia, or nitrates
