Page 1 of 35
NEVADA WASTEWATER TREATMENT PLANT OPERATOR
GRADE II EXAM NEWEST 2026 ACTUAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) ALL ANSWERED {100 Q & A} ALREADY
GRADED A+ | BRAND NEW! | 100% GUARANTEED PASS
1.Which factor primarily influences microbial growth in
an aeration tank?
A. Chlorine dosage
B. Food to microorganism ratio (F/M)
C. Sludge removal only
D. pH of chlorine
Rationale: The F/M ratio determines the availability of substrate
for microbial metabolism.
2. Which of the following is NOT a factor in determining
sludge settling characteristics?
A. Sludge age
B. Filamentous bacteria
C. Chlorine residual
D. Mixed liquor concentration
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Rationale: Chlorine affects disinfection, not directly the settling
behavior of sludge.
3. The term “SVI” refers to:
A. Soluble volume index
B. Suspended volatile index
C. Sludge volume index
D. Standard velocity index
Rationale: SVI measures sludge settleability in mL/g, indicating
bulking or settling issues.
4. Which type of filter is commonly used for polishing
tertiary effluent?
A. Trickling filter
B. Rapid sand filter
C. Grit chamber
D. Bar screen
Rationale: Rapid sand filters remove residual suspended solids to
improve effluent quality.
5. What is a common cause of odor in wastewater plants?
A. High pH
B. Anaerobic conditions
C. High DO
D. Coagulation
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Rationale: Anaerobic conditions produce hydrogen sulfide and
other odorous compounds.
6. Which compound is often added to wastewater to raise pH
for chemical precipitation?
A. Alum
B. Lime (Ca(OH)2)
C. Chlorine
D. Sodium bisulfite
Rationale: Lime raises pH, which facilitates precipitation of
phosphates and metals.
7. What is the purpose of a chlorine contact tank?
A. Remove suspended solids
B. Provide sufficient contact time for disinfection
C. Aerate wastewater
D. Remove ammonia
Rationale: Contact time ensures chlorine effectively inactivates
pathogens before discharge.
8. Which factor does NOT affect oxygen transfer
efficiency in aeration tanks?
A. Surface area of bubbles
B. Tank depth
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C. Water temperature
D. pH of the chlorine residual
Rationale: Chlorine residual does not impact oxygen transfer;
temperature, depth, and bubble size do.
9. What is the primary purpose of a grit chamber?
A. Remove heavy inorganic solids
B. Settle biological solids
C. Disinfect effluent
D. Reduce BOD
Rationale: Grit chambers protect equipment from abrasion by
removing sand, gravel, and other heavy particles.
10. Which type of pump is ideal for handling thick,
high-solids sludge?
A. Centrifugal
B. Gear pump
C. Progressive cavity pump
D. Piston pump
Rationale: Progressive cavity pumps can handle viscous, solids-
laden sludge without clogging.
11. Which is a major consideration when storing chlorine
cylinders?
A. Store in sunlight
B. Store in a cool, dry, well-ventilated area
NEVADA WASTEWATER TREATMENT PLANT OPERATOR
GRADE II EXAM NEWEST 2026 ACTUAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) ALL ANSWERED {100 Q & A} ALREADY
GRADED A+ | BRAND NEW! | 100% GUARANTEED PASS
1.Which factor primarily influences microbial growth in
an aeration tank?
A. Chlorine dosage
B. Food to microorganism ratio (F/M)
C. Sludge removal only
D. pH of chlorine
Rationale: The F/M ratio determines the availability of substrate
for microbial metabolism.
2. Which of the following is NOT a factor in determining
sludge settling characteristics?
A. Sludge age
B. Filamentous bacteria
C. Chlorine residual
D. Mixed liquor concentration
,Page 2 of 35
Rationale: Chlorine affects disinfection, not directly the settling
behavior of sludge.
3. The term “SVI” refers to:
A. Soluble volume index
B. Suspended volatile index
C. Sludge volume index
D. Standard velocity index
Rationale: SVI measures sludge settleability in mL/g, indicating
bulking or settling issues.
4. Which type of filter is commonly used for polishing
tertiary effluent?
A. Trickling filter
B. Rapid sand filter
C. Grit chamber
D. Bar screen
Rationale: Rapid sand filters remove residual suspended solids to
improve effluent quality.
5. What is a common cause of odor in wastewater plants?
A. High pH
B. Anaerobic conditions
C. High DO
D. Coagulation
,Page 3 of 35
Rationale: Anaerobic conditions produce hydrogen sulfide and
other odorous compounds.
6. Which compound is often added to wastewater to raise pH
for chemical precipitation?
A. Alum
B. Lime (Ca(OH)2)
C. Chlorine
D. Sodium bisulfite
Rationale: Lime raises pH, which facilitates precipitation of
phosphates and metals.
7. What is the purpose of a chlorine contact tank?
A. Remove suspended solids
B. Provide sufficient contact time for disinfection
C. Aerate wastewater
D. Remove ammonia
Rationale: Contact time ensures chlorine effectively inactivates
pathogens before discharge.
8. Which factor does NOT affect oxygen transfer
efficiency in aeration tanks?
A. Surface area of bubbles
B. Tank depth
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C. Water temperature
D. pH of the chlorine residual
Rationale: Chlorine residual does not impact oxygen transfer;
temperature, depth, and bubble size do.
9. What is the primary purpose of a grit chamber?
A. Remove heavy inorganic solids
B. Settle biological solids
C. Disinfect effluent
D. Reduce BOD
Rationale: Grit chambers protect equipment from abrasion by
removing sand, gravel, and other heavy particles.
10. Which type of pump is ideal for handling thick,
high-solids sludge?
A. Centrifugal
B. Gear pump
C. Progressive cavity pump
D. Piston pump
Rationale: Progressive cavity pumps can handle viscous, solids-
laden sludge without clogging.
11. Which is a major consideration when storing chlorine
cylinders?
A. Store in sunlight
B. Store in a cool, dry, well-ventilated area
