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Operator Class II Practice Exam

Study Material Jan 2, 2026 ★★★★☆ (4.0/5)
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North Dakota Wastewater Treatment Operator Class II Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

  • Which of the following is the primary purpose of preliminary
  • treatment in a wastewater treatment plant?

  • Remove dissolved organic matter
  • Remove large solids and debris
  • Remove nutrients
  • Disinfect the wastewater

Rationale: Preliminary treatment removes large solids, grit, and debris to

protect downstream equipment and processes.

  • / 4
  • What is the main function of a grit chamber?
  • Remove grease
  • Remove sand, gravel, and other heavy inorganic solids
  • Promote biological treatment
  • Remove pathogens

Rationale: Grit chambers allow heavy inorganic solids to settle while

preventing them from damaging pumps and other equipment.

  • Which microorganism is primarily responsible for breaking down
  • organic matter in an activated sludge system?

  • Viruses
  • Bacteria
  • Protozoa
  • Algae

Rationale: Bacteria metabolize organic matter, converting it into simpler

compounds and biomass.

  • What is the purpose of aeration in secondary treatment?
  • To remove heavy metals
  • To clarify effluent
  • To provide oxygen for microorganisms
  • To disinfect wastewater 2 / 4

Rationale: Aeration supplies oxygen that bacteria need for the aerobic

digestion of organic matter.

  • The process of removing nitrogen from wastewater using nitrification

and denitrification is called:

  • Phosphorus removal
  • Biological nutrient removal (BNR)
  • Chlorination
  • Sedimentation

Rationale: BNR processes remove nitrogen and sometimes phosphorus

through microbial conversions.

  • Which chemical is commonly used for disinfection in wastewater
  • treatment?

  • Ammonia
  • Chlorine
  • Lime
  • Sulfate

Rationale: Chlorine is widely used to kill pathogenic microorganisms in

treated effluent.

  • / 4
  • What is the main goal of tertiary treatment?
  • Remove grit
  • Polish effluent by removing nutrients and residual solids
  • Remove coarse debris
  • Aerate wastewater

Rationale: Tertiary treatment improves effluent quality by targeting residual

solids, nutrients, and sometimes pathogens.

  • What does BOD stand for?
  • Biological Oxidation Demand
  • Base Oxygen Dilution
  • Biochemical Oxygen Demand
  • Bacterial Oxidation Detection

Rationale: BOD measures the oxygen required by microorganisms to break

down organic matter in water.

9. A high BOD in influent indicates:

  • Low organic content
  • High organic content
  • Low nutrient concentration
  • High pH
  • / 4

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Category: Study Material
Added: Jan 2, 2026
Description:

North Dakota Wastewater Treatment Operator Class II Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf 1. Which of the following is the p...

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