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WASTEWATER OPERATOR CLASS 1 & 2 PRACTICE TEST QUESTIONS AND ANSWERS
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WASTEWATER OPERATOR CLASS 1 & 2 PRACTICE TEST QUESTIONS AND ANSWERS
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Name: Score:178 Multiple choice questions
Term 1 of 178
What percentage of cell tissue is broken down into carbon dioxide, ammonia, and water?
75-80%
65-70%
50-60%
50%
Term 2 of 178
What type of sample indicates the character of the wastewater over a period of time,
eliminates short duration effects, evens out high and low flows, and is a representative sample?
Representative sample
Laboratory sample
Random sample
Composite sample
Term 3 of 178
When visitors are touring your plant your greatest concern should be:
Their safety
Amperometric titration
Their efficacy
Temperature
,Term 4 of 178
In an active oxidation ditch, what flow can the operator control?
Chemical dosing flow and air flow
Axial flow pump
Influent flow and effluent flow
Return sludge flow and waste sludge flow
Term 5 of 178
What percentage of BOD is soluble?
85%
95%
50%
25%
Term 6 of 178
Synthesis:
the conversion of energy from sunlight into chemical energy.
decomposition of organic matter into simpler compounds.
production of new cells ***can not work without respiration
the process of breaking down waste materials into reusable resources.
Term 7 of 178
Respiration:
The process of converting inorganic materials into organic compounds.
The absorption of nutrients from the environment for growth.
Process of deriving energy from carbonaceous organic matter, BOD5, aka food. *** can
not work without synthesis
The breakdown of complex molecules into simpler ones for energy.
,Term 8 of 178
A sudden increase in organic loading on the biological treatment system, with an acidically
low pH, is known as a what?
Tension load
Shock load
Hook strain
Air lift
Term 9 of 178
What is the purpose of sleeves in a pump?
To allow for easier access to the internal components of the pump
To increase the diameter of the impeller for better performance
To serve as a decorative element on the exterior of the pump
To cover the shaft that supports the impeller to protect the shaft from the corrosive and
abrasive effects of the liquid going through the pump
Term 10 of 178
What should the operator do with plants/weeds growing along the water's edge with respect
to ponds?
Allow them to grow to provide shade for the pond
Remove them as they appear to avoid the establishment of a deep root system
Use chemicals to promote their growth
Plant more vegetation to stabilize the soil
, Term 11 of 178
What is the process for running the total suspended solids test?
Mix the sample with a chemical reagent, heat to boiling, and measure the volume
Weigh dry filter, filter sample, dry at 103° C for hour, place in desiccator 15 minutes,
weigh
Filter the sample through a wet filter, dry at 50° c for 30 minutes, and weigh
Soak the filter in water, dry at room temperature, and weigh after 24 hours
Term 12 of 178
Microorganisms/bacteria make up about ______ of the activated sludge biomass.
95%
75%
50%
30%
Term 13 of 178
It takes ___________ ppm of alkalinity to convvert 1 ppm nitrate (NO3).
10.5
3.8
7.2
5.0
Term 14 of 178
How should lantern rings be installed on the stuffing box as part of a pump unit?
Left empty to allow for better water flow
Filled with water to prevent overheating
Partially filled with oil to lubricate the pump
Completely filled with grease before all the rings of packing are in place.
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