Quiz On CA Water Treatment Plant Operator

26 Questions | Total Attempts: 3451

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Quiz On CA Water Treatment Plant Operator - Quiz

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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

  • 2. 
    Excessive turbidity will greatly increase the efficiency of the disinfecting chemical or process.
    • A. 

      True

    • B. 

      False

  • 3. 
    Organics found in the water can consume great amounts of disinfectants while forming unwanted compounds.
    • A. 

      True

    • B. 

      False

  • 4. 
    The demand for chlorine by reducing agents must be satisfied before chlorine becomes available to accomplish disinfection.
    • A. 

      True

    • B. 

      False

  • 5. 
    Chlorine by itself is nonflammable and nonexplosive, but it will support combustion.
    • A. 

      True

    • B. 

      False

  • 6. 
    The chlorine ion has no disinfecting power and produces no chlorine residual.
    • A. 

      True

    • B. 

      False

  • 7. 
    The use of hypochlorite to treat potable water achieves the same result as chlorine gas.
    • A. 

      True

    • B. 

      False

  • 8. 
    Public water supplies are normally chlorinated up to the breakpoint.
    • A. 

      True

    • B. 

      False

  • 9. 
    Ammonia must be present to produce the breakpoint chlorination curve from the addition of chlorine.
    • A. 

      True

    • B. 

      False

  • 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

  • 11. 
    Plastic containers are commonly used for storage of chlorine gas.
    • A. 

      True

    • B. 

      False

  • 12. 
    When chlorine gas condenses to liquid (reliquifies), the liquid chlorine may plug the chlorine supply lines.
    • A. 

      True

    • B. 

      False

  • 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

  • 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

  • 15. 
    Very often when consumers complain about chlorine tastes in their drinking water, the chlorine dose has been inadequate.
    • A. 

      True

    • B. 

      False

  • 16. 
    Sodium chlorite is very combustible around organic compounds.
    • A. 

      True

    • B. 

      False

  • 17. 
    Chlorine is a gas that is 2.5 times lighter than air.
    • A. 

      True

    • B. 

      False

  • 18. 
    Hypochlorite is much more hazardous than gaseous chlorine.
    • A. 

      True

    • B. 

      False

  • 19. 
    All lamps within an ultraviolet (UV) system are identical (type, length, diameter, power, and output).
    • A. 

      True

    • B. 

      False

  • 20. 
    Maintenance on ultraviolet (UV) systems requires cleaning the quartz sleeves and changing the lamps.
    • A. 

      True

    • B. 

      False

  • 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

  • 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.

  • 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.

  • 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.

  • 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.

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