TEXAS
WASTEWATER
CLASS A
CERTIFICATION
EXAM 200 +
COMPLETE
QUESTIONS AND
VERIFIED
SOLUTIONS LATEST
GUIDE
1. What is the primary purpose of wastewater treatment?
A. To increase water pressure
B. To remove contaminants before discharge
C. To add chemicals to rivers
D. To create drinking water directly
,Answer: B. To remove contaminants before discharge
2. Which process removes large debris at the headworks?
A. Aeration
B. Chlorination
C. Screening
D. Digestion
Answer: C. Screening
3. What does BOD stand for?
A. Biological Oxygen Demand
B. Basic Oxygen Distribution
C. Biological Oxidation Degree
D. Biochemical Organic Deposit
Answer: A. Biological Oxygen Demand
4. A high BOD in wastewater indicates:
A. Low organic strength
B. High organic pollution
C. Excellent water quality
D. High chlorine residual
Answer: B. High organic pollution
5. What is the typical purpose of grit removal?
A. Remove dissolved solids
,B. Remove grease
C. Remove sand and heavy inorganic particles
D. Remove bacteria
Answer: C. Remove sand and heavy inorganic particles
6. Primary clarifiers are mainly used to:
A. Remove dissolved oxygen
B. Settle suspended solids
C. Add chlorine
D. Increase pH
Answer: B. Settle suspended solids
7. Activated sludge is considered what type of treatment?
A. Preliminary
B. Primary
C. Secondary
D. Tertiary
Answer: C. Secondary
8. Which microorganism is most responsible for biological treatment?
A. Viruses
B. Algae
C. Bacteria
D. Protozoa
Answer: C. Bacteria
, 9. Dissolved oxygen in an aeration basin should generally be maintained:
A. At zero
B. Around 1–3 mg/L
C. Above 15 mg/L
D. Below 0.5 mg/L
Answer: B. Around 1–3 mg/L
10. What is the purpose of return activated sludge (RAS)?
A. Dispose of solids
B. Return microorganisms to aeration tank
C. Increase chlorine demand
D. Remove grit
Answer: B. Return microorganisms to aeration tank
11. Waste activated sludge (WAS) is removed to:
A. Maintain proper microorganism concentration
B. Raise pH
C. Lower flow rate
D. Increase oxygen demand
Answer: A. Maintain proper microorganism concentration
12. What is the typical pH range for effective biological treatment?
A. 2.0–4.0
B. 4.0–5.0
WASTEWATER
CLASS A
CERTIFICATION
EXAM 200 +
COMPLETE
QUESTIONS AND
VERIFIED
SOLUTIONS LATEST
GUIDE
1. What is the primary purpose of wastewater treatment?
A. To increase water pressure
B. To remove contaminants before discharge
C. To add chemicals to rivers
D. To create drinking water directly
,Answer: B. To remove contaminants before discharge
2. Which process removes large debris at the headworks?
A. Aeration
B. Chlorination
C. Screening
D. Digestion
Answer: C. Screening
3. What does BOD stand for?
A. Biological Oxygen Demand
B. Basic Oxygen Distribution
C. Biological Oxidation Degree
D. Biochemical Organic Deposit
Answer: A. Biological Oxygen Demand
4. A high BOD in wastewater indicates:
A. Low organic strength
B. High organic pollution
C. Excellent water quality
D. High chlorine residual
Answer: B. High organic pollution
5. What is the typical purpose of grit removal?
A. Remove dissolved solids
,B. Remove grease
C. Remove sand and heavy inorganic particles
D. Remove bacteria
Answer: C. Remove sand and heavy inorganic particles
6. Primary clarifiers are mainly used to:
A. Remove dissolved oxygen
B. Settle suspended solids
C. Add chlorine
D. Increase pH
Answer: B. Settle suspended solids
7. Activated sludge is considered what type of treatment?
A. Preliminary
B. Primary
C. Secondary
D. Tertiary
Answer: C. Secondary
8. Which microorganism is most responsible for biological treatment?
A. Viruses
B. Algae
C. Bacteria
D. Protozoa
Answer: C. Bacteria
, 9. Dissolved oxygen in an aeration basin should generally be maintained:
A. At zero
B. Around 1–3 mg/L
C. Above 15 mg/L
D. Below 0.5 mg/L
Answer: B. Around 1–3 mg/L
10. What is the purpose of return activated sludge (RAS)?
A. Dispose of solids
B. Return microorganisms to aeration tank
C. Increase chlorine demand
D. Remove grit
Answer: B. Return microorganisms to aeration tank
11. Waste activated sludge (WAS) is removed to:
A. Maintain proper microorganism concentration
B. Raise pH
C. Lower flow rate
D. Increase oxygen demand
Answer: A. Maintain proper microorganism concentration
12. What is the typical pH range for effective biological treatment?
A. 2.0–4.0
B. 4.0–5.0
