2.2 - QUIZ 2

1. The average domestic sewage will have a BOD5 of about:
A. 150 to 250 milligrams per liter
B. 20 milligrams per liter
C. 0.17 milligrams per liter
D. No answer applies

2. Municipal wastewater usually consists of:
A. Domestic wastewater
B. Ground water and stormwater
C. Industrial wastes
D. All answers apply

3. A bacterial group that is easily identifiable and has warm-blooded animals as its sourceis:
A. Fecal coliform
B. Fecal pathogenic
C. Anaerobic
D. Fecal aerobic

4. An advantage of an aerated lagoon over a facultative lagoon is:
A. It does not require as much land area
B. It is not as dependent upon climate and weather
C. It is mixed by the aerators
D. All answers apply

5. Bacteria that require oxygen to live and grow are:
A. Aerobic bacteria
B. Anaerobic bacteria
C. Facultative bacteria
D. All answers apply

6. At what level should a conventional lagoon be operated in winter if there is excess I & I?
A. 4 ft. to enhance photosynthesis
B. 5 ft. to increase detention time
C. Maximum depth to provide maximum detention time
D. Minimum depth to increase storage capacity

7. Which of the following is not a recommended action to control burrowing animals in a lagoon?
A. Remove aquatic vegetation from around levees
B. Frequently raise and lower the water level
C. Check with local game officials regarding using poison bait
D. Check with local game officials about trapping animals

8. Ultraviolet disinfection has the following benefits:
A. No toxic residual compounds
B. No need for dechlorination
C. No chemicals required
D. All answers apply

9. Given the following conditions, what is the problem? Chlorine residual is dropping; feed rate is not changed; and the feed rate rotameter did not drop when the cylinder valve closed.
A. Leak in vacuum line after rotameter
B. Leak in vacuum line before rotameter
C. Cylinder is out of gas
D. Ejector nozzle is plugged

10. Dechlorination is usually accomplished using:
A. Sodium hydroxide
B. Sulfur dioxide
C. Sodium chloride
D. Potassium permanganate

11. Nitrogen exists in municipal sludges in any of four (4) forms, organic, ammonia, nitrite, and nitrate. Which form can not be readily used by plants as nutrients?
A. Ammonia
B. Organic
C. Nitrite
D. Nitrate

12. One of the problems in using a weir to measure flow rates at a lagoon effluent is:
A. Solids in the overflowing liquid will cause the measurement to be too high
B. Solids build up at the downstream base of the weir plate causing inaccurate readings
C. Solids deposit upstream of the weir plate
D. All answers apply

13. Which is not considered a primary flow measuring device?
A. Water use records
B. Palmer-Bowlus flume
C. V-notch weir
D. Rectangular weir

14. Infiltration water is:
A. Ground water that leaks into the sewer
B. Storm run-off water
C. Industrial wastewater
D. The treated water from a third cell

15. Infiltration and inflow in a collection system causes which of the following problems:
A. Higher BOD concentrations
B. Excessive pumping costs
C. Reduce levels of coliforms
D. All answers apply

16. What is not a characteristic of a positive displacement pump:
A. Good pump for moving thick liquids
B. Moves a fixed volume of fluid per stroke
C. Moves a variable volume of fluid per stroke
D. Requires a piston, diaphragm or lobe

17. Which of the following is not a factor that would require wastewater to be pumped?
A. Location of treatment facility
B. Topography of land
C. Depth of sewers
D. I & I

18. An O&M manual is which of the following types of records?
A. Operational
B. As built
C. Physical plant
D. Maintenance

19. Which of the following is not typically included as part of an equipment record?
A. Manufacturer
B. Dates of purchase
C. Date of manufacture
D. Identification numbers

20. If you need to work on a floating aerator, which of these statements would be permissible actions?
A. Climb out of the boat onto the floats as it is easier to work from that position
B. Keep the electrical power turned on in case you want someone to turn the machine on
C. Tag and lock the circuit breaker before starting any work
D. Work alone

21. When you need to enter a lift station dry well compartment, you should always:
A. Secure the cover in the open position
B. Let the fan ventilate the compartment
C. Observe confined space safety rules
D. All answers apply

22. In order to run a biochemical oxygen demand determination on a chlorinated effluent, it is necessary, after dechlorinating the sample, to:
A. Add an excess of potassium permanganate to the sewage and them remove the excess permanganate with potassium oxlate
B. Add a solution of mineral salts to the sewage
C. Seed the sample with influent containing sewage organisms
D. Pass air through the effluent for a time

23. When sampling dissolved oxygen content it is proper procedure to:
A. Shake the sample to be sure it is in equilibrium
B. Place the sample in the refrigerator overnight before testing
C. Test the sample immediately
D. Add sodium sulfite to preserve the sample then keep in refrigeration until ready

24. The operator is required to:
A. Do the daily operation and maintenance
B. Do the required sampling and testing
C. Prepare reports and keep records.
D. All answers apply

25. Primacy means that:
A. The federal government agents have the right to inspect treatment facilities
B. The state government has responsibility for enforcement of the federal laws
C. The federal laws do not apply in the state
D. State laws have primacy over federal laws