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Water & Wastewater Operator (WPI/ABC Class I) — Practice Exam

WW equipment: instruments: practice questions

Our Water/Wastewater Operator bank has 4 questions on this topic. Here are 3 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · Wastewater Treatment Class I

Which device measures open-channel flow using a constriction?

  1. Turbidimeter
  2. Pressure gauge
  3. Parshall flume
  4. Magnetic flowmeter
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C. Parshall flume — Level upstream of the throat gives the flow.

Question 2 · Wastewater Treatment Class I

Why is telemetry used at remote lift stations?

  1. To clean pumps
  2. To send alarms and status to operators so problems are caught quickly
  3. To bill customers and measure BOD
  4. To measure BOD
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B. To send alarms and status to operators so problems are caught quickly — SCADA and telemetry are listed.

Question 3 · Wastewater Treatment Class I

What does an ORP (oxidation-reduction potential) probe help monitor?

  1. Turbidity
  2. Grit level
  3. Whether conditions are aerobic, anoxic or anaerobic, and chlorine/dechlorination
  4. Flow rate and sludge depth
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C. Whether conditions are aerobic, anoxic or anaerobic, and chlorine/dechlorination — Measured in millivolts.

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