WATER TREATMENT PRACTICE TEST
QUESTIONS AND ANSWERS ALL
CORRECT
When sodium hypochlorite is dissolved in water, which of the following is formed? -
Answer-Sodium hydroxide (lye, or caustic soda)
When chlorine gas is dissolved in water, two products are formed: - Answer-
Hydrochloric acid
The device used to regulate and control the rate of feed of chlorine gas is called a? -
Answer-Chlorinator
The chemical normally withdrawn from a bulk chlorine storage tank car or rail car is? -
Answer-Chlorine liquid
Chlorine residual is measured in the field using the? - Answer-DPD colorimetric method
The fusible plug that is in all chlorine containers? - Answer-Should never be removed or
tampered with
A chemical that is applied to drinking water mainly to provide a residual disinfection
benefit is referred to as a? - Answer-Secondary disinfectant
The term for the attached microbiological growth in a distribution system is the? -
Answer-Biofilm
Which of the following chemicals is commonly used for the formation of chloramines? -
Answer-Aqueous ammonia
Working within an atmosphere with a severe chlorine gas leak requires the use of a? -
Answer-Self-contained breathing apparatus (SCBA)
How long are you required to keep the tap closed before you grab a sample for lead and
copper? - Answer-6 hours
Which water source typically has the highest concentration of dissolved solids? -
Answer-Groundwater
What is the purpose of the lantern ring? - Answer-Cools and lubricates the packing
, What occurs in the first stage of the breakpoint chlorination curve? - Answer-Chlorine is
destroyed by reducing compounds
Which of the following is a strong acid? - Answer-pH = 1
A food supply for microorganisms can be measured in the laboratory as? - Answer-
Assimilable organic carbon
Bromate formation can be reduced by the addition of which of the following, prior to
ozonation? - Answer-Ammonia
Ozone is a major component of? - Answer-Smog
When no chlorine is added prior to the filtration processes, this process can be used to?
- Answer-Consume BDOC
Which of the following chemicals may be used to form chlorine dioxide? - Answer-
Sodium Chlorite
The most important disadvantage of using chloramines for disinfection is that they? -
Answer-Are the poorest of the four most common disinfectants
When operating with chloramine disinfection, the desired form is? - Answer-
Monochloramine
The combination of chlorine and ammonia is a disinfectant known as? - Answer-
Chloramines
Which of the following is a chemical disinfectant approved by the SWTR? - Answer-
Chlorine dioxide
The form of chloramines that has the most intense and undesirable odor is? - Answer-
Trichloramine
Which of the following is a form of combined chlorine? - Answer-Dichloramine
Which of the following is a form of free chlorine? - Answer-Hypochlorous acid
Of the four chemicals approved for water disinfection by the Surface Water Treatment
Rule, the one most associated with chlorite formation is? - Answer-Chlorine dioxide
Of the four chemicals approved for water disinfection by the SWTR, the one that
produces the highest bromate levels is normally? - Answer-Ozone
QUESTIONS AND ANSWERS ALL
CORRECT
When sodium hypochlorite is dissolved in water, which of the following is formed? -
Answer-Sodium hydroxide (lye, or caustic soda)
When chlorine gas is dissolved in water, two products are formed: - Answer-
Hydrochloric acid
The device used to regulate and control the rate of feed of chlorine gas is called a? -
Answer-Chlorinator
The chemical normally withdrawn from a bulk chlorine storage tank car or rail car is? -
Answer-Chlorine liquid
Chlorine residual is measured in the field using the? - Answer-DPD colorimetric method
The fusible plug that is in all chlorine containers? - Answer-Should never be removed or
tampered with
A chemical that is applied to drinking water mainly to provide a residual disinfection
benefit is referred to as a? - Answer-Secondary disinfectant
The term for the attached microbiological growth in a distribution system is the? -
Answer-Biofilm
Which of the following chemicals is commonly used for the formation of chloramines? -
Answer-Aqueous ammonia
Working within an atmosphere with a severe chlorine gas leak requires the use of a? -
Answer-Self-contained breathing apparatus (SCBA)
How long are you required to keep the tap closed before you grab a sample for lead and
copper? - Answer-6 hours
Which water source typically has the highest concentration of dissolved solids? -
Answer-Groundwater
What is the purpose of the lantern ring? - Answer-Cools and lubricates the packing
, What occurs in the first stage of the breakpoint chlorination curve? - Answer-Chlorine is
destroyed by reducing compounds
Which of the following is a strong acid? - Answer-pH = 1
A food supply for microorganisms can be measured in the laboratory as? - Answer-
Assimilable organic carbon
Bromate formation can be reduced by the addition of which of the following, prior to
ozonation? - Answer-Ammonia
Ozone is a major component of? - Answer-Smog
When no chlorine is added prior to the filtration processes, this process can be used to?
- Answer-Consume BDOC
Which of the following chemicals may be used to form chlorine dioxide? - Answer-
Sodium Chlorite
The most important disadvantage of using chloramines for disinfection is that they? -
Answer-Are the poorest of the four most common disinfectants
When operating with chloramine disinfection, the desired form is? - Answer-
Monochloramine
The combination of chlorine and ammonia is a disinfectant known as? - Answer-
Chloramines
Which of the following is a chemical disinfectant approved by the SWTR? - Answer-
Chlorine dioxide
The form of chloramines that has the most intense and undesirable odor is? - Answer-
Trichloramine
Which of the following is a form of combined chlorine? - Answer-Dichloramine
Which of the following is a form of free chlorine? - Answer-Hypochlorous acid
Of the four chemicals approved for water disinfection by the Surface Water Treatment
Rule, the one most associated with chlorite formation is? - Answer-Chlorine dioxide
Of the four chemicals approved for water disinfection by the SWTR, the one that
produces the highest bromate levels is normally? - Answer-Ozone
