Practice Examination Questions And

Utah Wastewater Operator Class II Practice Examination Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

1.What is the primary purpose of wastewater treatment?

• Produce drinking water
• Protect public health and the environment
• Generate biosolids
• Improve plant aesthetics

Rationale: The treatment process aims to remove contaminants to protect

water bodies and public health.

2.Which process is mainly responsible for removing settleable solids?

• Aeration 1 / 4

• Filtration
• Sedimentation
• Disinfection

Rationale: Sedimentation tanks allow heavier solids to settle out of

wastewater.

3.Which laboratory test measures organic strength in wastewater?

A. TSS

B. BOD

• pH
• Temperature

Rationale: BOD quantifies biodegradable organic material by measuring

oxygen demand.

4.Primary treatment typically removes what percentage of suspended solids?

A. 10–20%

B. 20–40%

C. 50–60%

D. 70–90%

Rationale: Primary clarifiers remove roughly half of suspended solids.

5. 2 / 4

Activated sludge systems rely on which biological group?

• Viruses
• Protozoa only
• Bacteria
• Algae

Rationale: Bacteria are the primary decomposers of organic matter in

activated sludge.

6.Which process converts ammonia to nitrate?

• Denitrification
• Nitrification
• Anaerobic digestion
• Chlorination

Rationale: Nitrifying bacteria oxidize ammonia to nitrite and nitrate.

7.Which gas is commonly produced in anaerobic digestion?

• Oxygen
• Ozone
• Nitrogen
• Methane

Rationale: Methane is the primary biogas produced during anaerobic

decomposition. 3 / 4

8.What is the typical pH range for biological treatment processes?

A. 3–5

B. 5–6

C. 6.5–8.5

D. 9–11

Rationale: Microorganisms thrive in near-neutral pH levels."

9.

TSS stands for:

• Total Soluble Solids
• Total Suspended Solids
• Total Sewer Solids
• Total Standard Solids

Rationale: Suspended solids are particles that can be trapped on a filter.

10.Which device measures flow in an open channel?

• Pitot tube
• Flow meter probe
• Parshall flume
• Pressure gauge

Rationale: Parshall flumes are standard open-channel flow measurement

structures.

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