Illinois Wastewater Operator Class 4 Practice Exam Questions and Correct Answers

Illinois Wastewater Operator Class 4 Practice Exam
Questions and Correct Answers
Question 1
An NPDES permitt requires that a permitte keeps records for
Correct Answer
3 years



Question 2
A loss of D.O. could cause a lagoon to go ------
Correct Answer
Septic



Question 3
Water can be dechlorinated for fecal coliform testing by the use of
Correct Answer
Sodium thiosulfate



Question 4
The sewer that transports the highest volume of water is
Correct Answer
Combined sewer



Question 5
The primary side of an electrical transformer is called
Correct Answer
The line in side




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,Question 6
Renewal of an NPDES permit can not be applied for any later than
Correct Answer
180 days before the expiration of current permit



Question 7
What could be used to increase D.O. in a lagoon
Correct Answer
Sodium Nitrate



Question 8
Chlorine gas is ---- than air.
Correct Answer
Heavier



Question 9
Septic is a condition produced by
Correct Answer
Anaerobic bacteria



Question 10
An NPDES permit is good for
Correct Answer
5 years



Question 11
A new lagoon should be started with
Correct Answer
1 to 2 feet of water to allow for sunlight penetration




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,Question 12
D.O. in a lagoon would be highedt in the------ and loqrst in the -------
Correct Answer
Morning, evening



Question 13
The line that brings the water to the wastewater treatment plant is the
Correct Answer
Trunk sewer



Question 14
A vacuum filter would
Correct Answer
Not follow a lagoon



Question 15
Anaerobic is a condition of
Correct Answer
No dissolved oxygen



Question 16
Inttermitant discharge from a lagoons effluent should be done in what seasons
Correct Answer
Spring and Fall




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, Question 17
Effluent from a lagoon should be drawn from ------ the waters surface or the spillway
should be surrounded by a ------- to prevent flatables from going out qith the
effluent.
Correct Answer
Below, scum baffle



Question 18
Cooper Sulfate would not be used to remove

Correct Answer
Blue Green Algae



Question 19
The BOD5 in a lagoon is removed by
Correct Answer
Bacteria



Question 20
Facultative bacteria can function in both
Correct Answer
Aerobic and anaerobic conditions



Question 21
The purpose of disinfection is to
Correct Answer
Reduce the number of pathogens




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