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Class E Practice Exam Questions And

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

  • What is the primary purpose of a wastewater treatment plant?
  • Generate electricity
  • Produce drinking water
  • Remove pollutants from wastewater before discharge
  • Increase water temperature

Rationale: The main goal of a wastewater treatment plant is to

remove pollutants and protect public health and the environment.

  • Which of the following is considered a physical method of wastewater
  • treatment?

  • Chlorination 1 / 4
  • Biological digestion
  • Sedimentation
  • Filtration with chemicals

Rationale: Sedimentation is a physical process where solids settle out

of wastewater due to gravity.

  • Which type of bacteria is primarily responsible for breaking down
  • organic matter in wastewater?

  • Sulfur bacteria
  • Acidophilic bacteria
  • Heterotrophic bacteria
  • Nitrifying bacteria

Rationale: Heterotrophic bacteria consume organic carbon and are

essential in the decomposition of organic matter.

  • What does BOD stand for in wastewater treatment?
  • Biological Oxidation Demand
  • Biochemical Oxygen Demand
  • Bacterial Oxidation Density
  • Base Oxygen Diffusion

Rationale: BOD measures the amount of oxygen required by

microorganisms to decompose organic matter in water.

  • Which unit process primarily removes suspended solids from
  • wastewater?

  • Chlorination 2 / 4
  • Aeration
  • Sedimentation
  • Filtration

Rationale: Sedimentation allows solids to settle out of the water,

reducing suspended solids.

6. pH is a measure of:

  • Temperature
  • Turbidity
  • Acidity or alkalinity
  • Total dissolved solids

Rationale: pH measures the hydrogen ion concentration and

indicates whether water is acidic, neutral, or basic.

  • What is the typical pH range for wastewater entering a treatment
  • plant?

A. 1–3

B. 11–14

C. 6–9

D. 4–5

Rationale: Most domestic wastewater has a pH near neutral,

typically between 6 and 9.

  • What is the primary function of a grit chamber?
  • Remove oils
  • Reduce BOD 3 / 4
  • Remove sand, gravel, and heavy particles
  • Kill bacteria

Rationale: Grit chambers allow heavy inorganic materials to settle

out, preventing damage to equipment.

  • Which of the following is considered a chemical method of
  • wastewater treatment?

  • Filtration
  • Sedimentation
  • Coagulation and flocculation
  • Screening

Rationale: Coagulation and flocculation use chemicals to aggregate

fine particles for easier removal.

  • Which type of filter media is commonly used in wastewater
  • filtration?

  • Sand
  • Activated carbon
  • Anthracite
  • All of the above

Rationale: Sand, activated carbon, and anthracite are all used

depending on the type of filtration process.

  • What is the purpose of an aeration tank in activated sludge
  • processes?

  • Remove grit
  • / 4

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Added: Jan 2, 2026
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