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Operator Class III Practice Exam 100

Study Material Jan 2, 2026 ★★★★☆ (4.0/5)
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Manitoba Wastewater Treatment Operator Class III Practice Exam 100 Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

  • What is the primary purpose of secondary treatment in wastewater
  • plants?

  • Removal of grit
  • Removal of heavy metals
  • Removal of dissolved and colloidal organics
  • Disinfection

Rationale: Secondary treatment uses biological processes to remove

organic material not removed in primary treatment.

  • In activated sludge, the term MCRT refers to: 1 / 4
  • Mixed Cell Retention Time
  • Mean Cell Residence Time
  • Maximum Clarifier Return Time
  • Mean Clarifier Retention Time

Rationale: MCRT is the average time microorganisms remain in the

treatment system.

3. A typical range for DO in an aeration basin is:

  • 0.1–0.5 mg/L
  • 5–8 mg/L
  • 1–3 mg/L
  • 8–10 mg/L

Rationale: Most activated sludge systems are optimized at 1–3 mg/L DO.

4. Nitrification is carried out primarily by:

  • Algae
  • Autotrophic bacteria
  • Protozoa
  • Fungi

Rationale: Nitrosomonas and Nitrobacter are autotrophic nitrifiers.

  • What is the main operational indicator of clarifier sludge settling
  • quality?

  • pH
  • Alkalinity 2 / 4

C. ORP

D. SVI

Rationale: Sludge Volume Index (SVI) measures settling characteristics of

activated sludge.

  • Which parameter indicates the oxygen demand of organic matter?

A. TSS

B. BOD

C. VSS

  • Alkalinity

Rationale: BOD measures how much oxygen microorganisms require to

degrade organics.

7. A sudden drop in pH in a nitrifying system usually indicates:

  • Excess alkalinity
  • Increased nitrification
  • Decreased nitrogen load
  • Increased sludge age

Rationale: Nitrification consumes alkalinity and lowers pH.

8. In a primary clarifier, typical removal of TSS is:

A. 5–10%

B. 90–95%

C. 50–70%

D. 80–90% 3 / 4

Rationale: Primary settling removes roughly half to two-thirds of

suspended solids.

9. RAS stands for:

  • Raw Activated Sludge
  • Return Activated Sludge
  • Residual Aeration Solids
  • Recycled Aerobic Solids

Rationale: RAS is sludge pumped from clarifier underflow back to aeration.

10. The primary purpose of waste activated sludge (WAS) removal is to:

  • Improve clarifier scum removal
  • Control sludge age
  • Increase DO
  • Reduce alkalinity

Rationale: Sludge wasting regulates MCRT and microbial population.

  • Trickling filters primarily use which microbial growth type?
  • Suspended growth
  • Attached growth
  • Floating growth
  • Anaerobic growth

Rationale: Trickling filters use biofilm attached to media.

  • What is the main consequence of too low MCRT?
  • / 4

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Added: Jan 2, 2026
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