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

WT source water: practice questions

Our Water/Wastewater Operator bank has 13 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · Water Treatment Class I

What does high raw-water turbidity after heavy rain usually mean for treatment?

  1. Less coagulant is needed because rain dilutes the raw water
  2. Less coagulant needed
  3. Higher coagulant demand and more filter loading
  4. Treatment can be skipped
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C. Higher coagulant demand and more filter loading — Source water changes drive process changes.

Question 2 · Water Treatment Class I

During summer stratification, what is often found in the bottom layer (hypolimnion)?

  1. High pH and low hardness
  2. Low oxygen, with dissolved iron, manganese and hydrogen sulfide
  3. High oxygen and warm water
  4. High oxygen, warm water and fewer nutrients than the surface layer
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B. Low oxygen, with dissolved iron, manganese and hydrogen sulfide — Choosing intake depth can avoid it.

Question 3 · Water Treatment Class I

What is an aquifer?

  1. A surface reservoir behind a dam that stores river water for the treatment plant
  2. An underground layer of rock or soil that holds and transmits water
  3. An elevated storage tank
  4. A water tower
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B. An underground layer of rock or soil that holds and transmits water — Confined aquifers are capped by low-permeability layers.

Question 4 · Water Treatment Class I

What is the purpose of a wellhead protection program?

  1. Limiting contaminating activities near wells
  2. Measuring well depth and installing new pumps and screens in old wells
  3. Adding chlorine to wells
  4. Measuring well depth and installing pumps
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A. Limiting contaminating activities near wells — Source water protection is in the outline.

Question 5 · Water Treatment Class I

What is groundwater under the direct influence of surface water (GWUDI)?

  1. Any well water drawn from a shallow aquifer less than 100 feet below the surface
  2. Water from a deep confined aquifer
  3. A groundwater source that surface water affects enough to need surface water treatment
  4. Rainwater collected in cisterns
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C. A groundwater source that surface water affects enough to need surface water treatment — Signs include changes with rain and microscopic organisms.

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