ADEQ WASTEWATER TREATMENT 100 QUESTIONS
& CORRECT ANSWERS LATEST 2026/2027
Reason to use prechlorination at a wastewater treatment facility?
a. Decrease TSS load
b. Begin sterilization process
c. Inhibit growth of odor-producing bacteria
d. Promote settling of inorganic materials - ANSWER-Inhibit growth of odor-
producing bacteria
The electrical current draw rate is measured in?
a. Volts
b. Amps
c. Ohms
d. Watts - ANSWER-Amps
All piping connections in a chlorine gas system should be checked for leaks by:
a. Pressure gauge
b. Ammonia vapors near connections
c. Misting water
d. Looking for signs of corrosion - ANSWER-Ammonia vapors near connections
Improper use or lack of backflow preventers may create:
,a. Increased water pressure
b. Low water pressure
c. Contamination
d. Fluctuating water pressure - ANSWER-Contamination
Tool to check bearings on an electrical motor?
a. Tachometer
b. Stethoscope
c. Vibration meter
d. Oscilloscope - ANSWER-Vibration meter
Longest life seal under normal conditions?
a. Mechanical seal
b. Water seal
c. Packing seal
d. Gland seal - ANSWER-Mechanical seal
pH test with an electrode?
a. Raise temperature to 40°C
b. Lower temperature to 2°C
c. Dechlorinate
d. Maintain constant stirring rate - ANSWER-Maintain constant stirring rate
Dry chemical feeder: 2.65 lbs in 5 minutes. What is the rate?
a. 13 lbs/day
, b. 763 lbs/day
c. 3883 lbs/day
d. 48,203 lbs/day - ANSWER-763 lbs/day
Changing oil every 1000 hours is what type of maintenance?
a. Preventative
b. Reactive
c. Run-to-failure
d. Conditional - ANSWER-Preventative
Sludge sample test for MLSS?
a. Remix
b. Filter
c. Allow to stand
d. Acidity - ANSWER-Filter
Minimum DO level test time on a facultative lagoon?
a. 5 am
b. 11 am
c. 5 pm
d. 11 pm - ANSWER-5 am
Which form of solids is MOST difficult to remove in a gravity treatment process?
a. Coagulant
b. Precipitated
& CORRECT ANSWERS LATEST 2026/2027
Reason to use prechlorination at a wastewater treatment facility?
a. Decrease TSS load
b. Begin sterilization process
c. Inhibit growth of odor-producing bacteria
d. Promote settling of inorganic materials - ANSWER-Inhibit growth of odor-
producing bacteria
The electrical current draw rate is measured in?
a. Volts
b. Amps
c. Ohms
d. Watts - ANSWER-Amps
All piping connections in a chlorine gas system should be checked for leaks by:
a. Pressure gauge
b. Ammonia vapors near connections
c. Misting water
d. Looking for signs of corrosion - ANSWER-Ammonia vapors near connections
Improper use or lack of backflow preventers may create:
,a. Increased water pressure
b. Low water pressure
c. Contamination
d. Fluctuating water pressure - ANSWER-Contamination
Tool to check bearings on an electrical motor?
a. Tachometer
b. Stethoscope
c. Vibration meter
d. Oscilloscope - ANSWER-Vibration meter
Longest life seal under normal conditions?
a. Mechanical seal
b. Water seal
c. Packing seal
d. Gland seal - ANSWER-Mechanical seal
pH test with an electrode?
a. Raise temperature to 40°C
b. Lower temperature to 2°C
c. Dechlorinate
d. Maintain constant stirring rate - ANSWER-Maintain constant stirring rate
Dry chemical feeder: 2.65 lbs in 5 minutes. What is the rate?
a. 13 lbs/day
, b. 763 lbs/day
c. 3883 lbs/day
d. 48,203 lbs/day - ANSWER-763 lbs/day
Changing oil every 1000 hours is what type of maintenance?
a. Preventative
b. Reactive
c. Run-to-failure
d. Conditional - ANSWER-Preventative
Sludge sample test for MLSS?
a. Remix
b. Filter
c. Allow to stand
d. Acidity - ANSWER-Filter
Minimum DO level test time on a facultative lagoon?
a. 5 am
b. 11 am
c. 5 pm
d. 11 pm - ANSWER-5 am
Which form of solids is MOST difficult to remove in a gravity treatment process?
a. Coagulant
b. Precipitated
