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Operator Level 2 Exam Practice Questions

Class notes Jan 2, 2026 ★★★★☆ (4.0/5)
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Prince Edward Island Wastewater Operator Level 2 Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

  • What is the primary purpose of a grit chamber in wastewater
  • treatment?

a) To remove dissolved organic matter

b) To remove suspended solids

c) To remove heavy inorganic particles

d) To disinfect the wastewater

Rationale: Grit chambers are designed to remove sand, gravel, and other

heavy inorganic solids to prevent damage and abrasion to downstream equipment. 1 / 4

  • The most common method for measuring flow in a wastewater

treatment plant is:

a) Weir

b) Pitot tube

c) Parshall flume

d) Orifice plate

Rationale: Parshall flumes are widely used because they provide accurate

flow measurements with minimal maintenance.

  • What is the primary function of a primary clarifier?

a) Remove dissolved nutrients

b) Settle suspended solids

c) Disinfect the water

d) Oxidize organic matter

Rationale: Primary clarifiers allow suspended solids to settle out by gravity

before the wastewater moves to secondary treatment.

  • Which process is used to biologically remove nitrogen in wastewater?

a) Filtration

b) Nitrification and denitrification

c) Chlorination

d) Coagulation

Rationale: Nitrification converts ammonia to nitrate, and denitrification

converts nitrate to nitrogen gas, effectively removing nitrogen. 2 / 4

  • What is the typical detention time for a primary clarifier?
  • 10–15 minutes
  • 1–2 hours
  • 6–8 hours
  • 24 hours

Rationale: Primary clarifiers typically have a detention time of 1–2 hours to

allow solids to settle effectively.

  • Which microorganism is most important for biological treatment of
  • wastewater?

a) Viruses

b) Protozoa

c) Bacteria

d) Algae

Rationale: Bacteria are the main organisms responsible for decomposing

organic matter in biological treatment processes.

7. Activated sludge is classified as:

a) Chemical treatment

b) Biological treatment

c) Physical treatment

d) Disinfection

Rationale: Activated sludge is a biological process that uses

microorganisms to remove organic matter from wastewater. 3 / 4

8. The main goal of secondary treatment is to:

a) Remove grit

b) Remove fats, oils, and grease

c) Remove dissolved and suspended organic matter

d) Remove heavy metals

Rationale: Secondary treatment focuses on reducing BOD, suspended

solids, and other biodegradable organics.

  • Which parameter indicates the amount of oxygen required by
  • microorganisms to decompose organic matter?

a) COD

b) TSS

c) BOD

  • pH

Rationale: BOD (Biochemical Oxygen Demand) measures the oxygen

needed by microorganisms to break down organic matter.

10. A sudden drop in pH of influent wastewater can cause:

a) Increased BOD removal

b) Enhanced nitrification

c) Shock to biological processes

d) Faster sedimentation

Rationale: Sudden pH changes can inhibit microbial activity and disturb

biological treatment processes.

  • / 4

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Added: Jan 2, 2026
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Prince Edward Island Wastewater Operator Level 2 Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf 1. What is the primary purpose of a g...

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