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

WT safety: practice questions

Our Water/Wastewater Operator bank has 8 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

Where does an operator find a chemical's hazards and first aid steps?

  1. Its Safety Data Sheet (SDS)
  2. The equipment nameplate
  3. The pump manual and the chemical supplier's price list
  4. The SCADA screen
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A. Its Safety Data Sheet (SDS) — Hazard Communication standard.

Question 2 · Water Treatment Class I

What breathing protection is needed to respond to a major chlorine leak?

  1. A dust mask
  2. Self-contained breathing apparatus (SCBA)
  3. No protection
  4. An air-purifying cartridge respirator for any concentration
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B. Self-contained breathing apparatus (SCBA) — High concentrations are immediately dangerous to life.

Question 3 · Water Treatment Class I

What is a permit-required confined space?

  1. Any room with a single door, such as an office or a storage closet
  2. A walk-in cooler with an open door
  3. A confined space with a serious hazard, such as a dangerous atmosphere
  4. Any room with a door
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C. A confined space with a serious hazard, such as a dangerous atmosphere — 29 CFR 1910.146.

Question 4 · Water Treatment Class I

What is the role of the attendant during a confined space entry?

  1. Enter the space to help the entrant whenever they seem to be having trouble
  2. Stay outside, monitor entrants and summon rescue
  3. Leave once the entrants are inside
  4. Sign the permit and then go back to other work
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B. Stay outside, monitor entrants and summon rescue — 1910.146(i).

Question 5 · Water Treatment Class I

When mixing acid with water, what is the safe practice?

  1. Mix them at the same time
  2. Add acid slowly to water, never water to acid
  3. Add water to acid quickly, so the mixture heats evenly
  4. Add both to a dry container
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B. Add acid slowly to water, never water to acid — Adding water to acid can cause violent boiling and splashing.

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