Quiz On CA Water Treatment Plant Operator
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Questions and Answers
- 1.
Chlorine disinfects water much slower at a pH around 7.0 than at a pH over 8.0.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Chlorine actually disinfects water more efficiently at a pH around 7.0 than at a pH over 8.0. This is because the effectiveness of chlorine as a disinfectant decreases as the pH increases. At a higher pH, chlorine molecules tend to combine with other compounds in the water, forming less effective disinfectants. Therefore, the statement that chlorine disinfects water slower at a pH around 7.0 is false.Rate this question:
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- 2.
Excessive turbidity will greatly increase the efficiency of the disinfecting chemical or process.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Excessive turbidity will not increase the efficiency of the disinfecting chemical or process. In fact, high levels of turbidity can interfere with the disinfection process by shielding microorganisms from the disinfectant and reducing its effectiveness. Therefore, the statement is false.Rate this question:
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- 3.
Organics found in the water can consume great amounts of disinfectants while forming unwanted compounds.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Organics, such as organic matter or organic compounds, present in water can react with disinfectants, such as chlorine, and consume them. This reaction can lead to the formation of unwanted compounds, such as disinfection byproducts, which can be harmful to human health. Therefore, it is true that organics found in water can consume significant amounts of disinfectants while forming unwanted compounds.Rate this question:
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- 4.
The demand for chlorine by reducing agents must be satisfied before chlorine becomes available to accomplish disinfection.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Chlorine is commonly used as a disinfectant in water treatment. However, before it can be used for disinfection, it first needs to react with any reducing agents present in the water. This is because reducing agents have a higher demand for chlorine and will consume it before it can effectively disinfect the water. Therefore, the statement that the demand for chlorine by reducing agents must be satisfied before chlorine becomes available for disinfection is true.Rate this question:
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- 5.
Chlorine by itself is nonflammable and nonexplosive, but it will support combustion.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Chlorine, in its pure form, is not flammable or explosive. However, it can support combustion, meaning that it can enhance the burning process of other substances. When combined with flammable materials, chlorine can increase the intensity and rate of combustion, making it a potential fire hazard. Therefore, the statement that chlorine supports combustion is true.Rate this question:
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- 6.
The chlorine ion has no disinfecting power and produces no chlorine residual.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because the chlorine ion itself does not have disinfecting power. Disinfection is typically achieved through the use of chlorine compounds, such as chlorine gas or hypochlorite, which release chlorine ions when dissolved in water. These chlorine ions then react with microorganisms and other contaminants to disinfect the water. However, the chlorine ion alone does not have the ability to disinfect or produce a chlorine residual.Rate this question:
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- 7.
The use of hypochlorite to treat potable water achieves the same result as chlorine gas.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Hypochlorite is a chemical compound that releases chlorine when dissolved in water. Chlorine gas is also used to treat potable water. Both hypochlorite and chlorine gas release chlorine, which is a powerful disinfectant that kills bacteria and other harmful microorganisms in water. Therefore, using hypochlorite to treat potable water achieves the same result as using chlorine gas.Rate this question:
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- 8.
Public water supplies are normally chlorinated up to the breakpoint.
- A.
True
- B.
False
Correct Answer
B. False -
- 9.
Ammonia must be present to produce the breakpoint chlorination curve from the addition of chlorine.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because ammonia is required to produce the breakpoint chlorination curve when chlorine is added. The breakpoint chlorination process is used to remove ammonia and organic nitrogen compounds from water. When chlorine is added to water containing ammonia, it reacts with the ammonia to form chloramines. As more chlorine is added, the chloramines continue to react and break down, resulting in the breakpoint chlorination curve. Without ammonia, this curve cannot be produced.Rate this question:
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- 10.
For extremely clean source waters, there may be virtually no Giardia or viruses and achieving 3-log or 4-log inactivation levels will be impossible and not necessary.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement suggests that in extremely clean source waters, there may be very few or no Giardia or viruses present. Therefore, achieving 3-log or 4-log inactivation levels (which refers to reducing the number of microorganisms by a certain factor) would be impossible and unnecessary. This implies that the water is already safe and does not require further treatment to remove pathogens. Hence, the answer is true.Rate this question:
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- 11.
Plastic containers are commonly used for storage of chlorine gas.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Plastic containers are not commonly used for the storage of chlorine gas because chlorine gas is highly corrosive and can react with certain types of plastics, leading to leaks or even explosions. Instead, chlorine gas is typically stored in steel containers or cylinders that are specifically designed to withstand its corrosive properties.Rate this question:
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- 12.
When chlorine gas condenses to liquid (reliquifies), the liquid chlorine may plug the chlorine supply lines.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When chlorine gas condenses to liquid, it undergoes a significant decrease in volume. This change in state from gas to liquid can cause the liquid chlorine to occupy less space than the gas did. As a result, if the liquid chlorine is not properly managed, it may accumulate and block the chlorine supply lines. Therefore, the statement that liquid chlorine may plug the chlorine supply lines is true.Rate this question:
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- 13.
When operating a hypochlorinator; you should compare the actual chlorine dose applied to the water being treated with the desired chlorine dose in milligrams per liter.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When operating a hypochlorinator, it is important to compare the actual chlorine dose applied to the water being treated with the desired chlorine dose in milligrams per liter. This is necessary to ensure that the correct amount of chlorine is being added to the water to effectively disinfect it. By comparing the actual and desired chlorine doses, any discrepancies can be identified and adjustments can be made to maintain the desired chlorine concentration in the treated water.Rate this question:
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- 14.
When looking for a chlorine leak, never apply ammonia solutions directly to any valve because an acid will form that will eat away the valve fittings.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Applying ammonia solutions directly to valves can lead to the formation of an acid. This acid can cause damage to the valve fittings. Therefore, it is advised to never apply ammonia solutions directly to any valve when searching for a chlorine leak. Hence, the statement is true.Rate this question:
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- 15.
Very often when consumers complain about chlorine tastes in their drinking water, the chlorine dose has been inadequate.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When consumers complain about chlorine tastes in their drinking water, it is likely that the chlorine dose has been inadequate. This means that the amount of chlorine added to the water is not enough to effectively disinfect it, resulting in a residual taste of chlorine. This is a common issue in water treatment systems where the chlorine dosage may not be properly regulated or monitored.Rate this question:
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- 16.
Sodium chlorite is very combustible around organic compounds.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Sodium chlorite is a highly reactive compound that can release oxygen when heated or in contact with organic materials. This oxygen can then fuel a fire, making sodium chlorite combustible around organic compounds. Therefore, the statement "Sodium chlorite is very combustible around organic compounds" is true.Rate this question:
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- 17.
Chlorine is a gas that is 2.5 times lighter than air.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Chlorine is a gas that is actually 2.5 times denser than air. It is heavier than air, not lighter.Rate this question:
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- 18.
Hypochlorite is much more hazardous than gaseous chlorine.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because gaseous chlorine is more hazardous than hypochlorite. Gaseous chlorine is a highly toxic and reactive gas that can cause severe respiratory and eye irritation, as well as lung damage. It can also be lethal in high concentrations. On the other hand, hypochlorite, which is commonly found in household bleach, is less hazardous. While it can still cause skin and eye irritation, it is generally less toxic and poses a lower risk compared to gaseous chlorine.Rate this question:
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- 19.
All lamps within an ultraviolet (UV) system are identical (type, length, diameter, power, and output).
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because for an ultraviolet (UV) system to function effectively, all lamps need to be identical in terms of their type, length, diameter, power, and output. This uniformity ensures that the system operates consistently and efficiently, as any variation in the lamps' specifications could lead to uneven distribution of UV light or inadequate disinfection. Therefore, maintaining identical lamps within the UV system is crucial for its proper functioning.Rate this question:
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- 20.
Maintenance on ultraviolet (UV) systems requires cleaning the quartz sleeves and changing the lamps.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Maintenance on ultraviolet (UV) systems requires cleaning the quartz sleeves and changing the lamps. This statement is true because quartz sleeves, which protect the UV lamps, can become dirty or fouled over time, reducing the effectiveness of the UV system. Therefore, regular cleaning of the quartz sleeves is necessary to maintain optimal performance. Additionally, UV lamps have a limited lifespan and need to be replaced periodically to ensure that the UV system continues to function properly.Rate this question:
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- 21.
Ozone is normally generated on site because it is very unstable and decomposes to elemental oxygen in a short time after generation.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Ozone is a highly reactive gas composed of three oxygen atoms. It is unstable and tends to decompose back into elemental oxygen relatively quickly. Therefore, it is more practical to generate ozone on-site when needed rather than storing it for long periods of time. This ensures that the ozone is fresh and at its highest concentration when used for various applications such as air purification or water treatment.Rate this question:
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- 22.
Why are there very few natural waters that are safe to drink without treatment of some kind?
- A.
Because of advances in the field of pollution detection technology.
- B.
Because of population growth and related pollution of waters.
- C.
Because of the excessive demands on operators' time, which have prevented adequate O & M.
- D.
Because of the lack of maintenance and deterioration of treatment equipment.
Correct Answer
B. Because of population growth and related pollution of waters.Explanation
The correct answer is "Because of population growth and related pollution of waters." This answer suggests that the increase in population has led to an increase in pollution of water sources, making it unsafe to drink without treatment. As more people inhabit an area, there is a greater demand for resources, leading to the release of pollutants into the environment. These pollutants can contaminate natural water sources, making them unsafe for consumption without some form of treatment to remove or neutralize the contaminants.Rate this question:
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- 23.
What is the chlorine demand?
- A.
The amount of chlorine needed to satisfy the chlorine demand and the amount of chlorine residual needed for disinfection.
- B.
The amount of chlorine sufficient to kill the microorganisms present in the water supply
- C.
The amount of chlorine that reacts with the organic and inorganic materials in water.
- D.
The total amount of all compounds with disinfecting properties plus any remaining free (uncombined) chlorine.
Correct Answer
B. The amount of chlorine sufficient to kill the microorganisms present in the water supplyExplanation
The chlorine demand refers to the amount of chlorine that is required to effectively kill the microorganisms present in the water supply. It is a measure of the quantity of chlorine needed to achieve disinfection.Rate this question:
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- 24.
How can the formation of suspected carcinogenic compounds (trihalomethanes) be prevented as a result of the chemical reactions that take place between organic materials and chlorine?
- A.
By limiting the amount of prechlorination and by removing the organic materials prior to chlorination.
- B.
By neutralizing the formation of carcinogenic compounds.
- C.
By removing any doubt or suspicion about the chemical reactions.
- D.
By revealing the direction of the chemical reactions.
Correct Answer
A. By limiting the amount of prechlorination and by removing the organic materials prior to chlorination.Explanation
The formation of suspected carcinogenic compounds (trihalomethanes) can be prevented by limiting the amount of prechlorination and by removing the organic materials prior to chlorination. Prechlorination refers to the practice of adding chlorine to water before it goes through the treatment process. By limiting the amount of prechlorination, the potential for the formation of trihalomethanes is reduced. Additionally, removing the organic materials before chlorination ensures that there are fewer organic compounds available to react with chlorine, further minimizing the formation of trihalomethanes.Rate this question:
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- 25.
What is breakpoint chlorination?
- A.
Addition of chlorine to water until the chlorine demand has been satisfied.
- B.
Compounds formed by the reaction of hypochlorous acid (or aqueous chlorine) with ammonia.
- C.
Organic compounds combined with chlorine.
- D.
Phenolic compounds (carbolic acids) combined with chlorine.
Correct Answer
A. Addition of chlorine to water until the chlorine demand has been satisfied.Explanation
Breakpoint chlorination is the process of adding chlorine to water until the chlorine demand has been met. This means adding enough chlorine to the water to effectively disinfect it and oxidize any organic or inorganic compounds present. By reaching the breakpoint, all the chlorine demand is satisfied, ensuring that the water is safe for use.Rate this question:
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- 26.
What is a major limitation of using chloramine residuals?
- A.
Ammonia creates high chlorine demands.
- B.
Chloramines are less effective as a disinfectant than free chlorine residuals.
- C.
Chloramines tend to enhance the production of tastes and odors
- D.
The process is relatively expensive.
Correct Answer
B. Chloramines are less effective as a disinfectant than free chlorine residuals.Explanation
Chloramines are less effective as a disinfectant than free chlorine residuals because they have a slower kill rate and are less able to penetrate the cell walls of microorganisms. This means that chloramines may not be as effective in killing bacteria, viruses, and other pathogens in water compared to free chlorine residuals. This limitation may require higher concentrations or longer contact times of chloramines to achieve the desired level of disinfection, making the use of chloramines less efficient and potentially less effective in certain situations.Rate this question:
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Water Treatment Plant Operation Volume 2 Chapter 17
Water Treatment Plant Operation Volume 2 Chapter 17
Water Treatment Plant Operation Volume 2 Chapter 16
Water Treatment Plant Operation Volume 2 Chapter 16
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