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

WD components: storage: practice questions

Our Water/Wastewater Operator bank has 7 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 Distribution Class I

What turnover time (water age) should storage structures be able to maintain, per the Ten States Standards?

  1. 1 year
  2. 1 hour
  3. 5 days or less
  4. 30 days or more
Show the answer

C. 5 days or less — Excess storage causes water quality problems.

Question 2 · Water Distribution Class I

Why should storage tank access hatches be locked?

  1. To keep the water warm in winter and increase pressure
  2. To prevent tampering and contamination
  3. To keep birds from nesting
  4. To increase pressure
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B. To prevent tampering and contamination — Security is part of the outline.

Question 3 · Water Distribution Class I

Why must storage tank vents and overflows be screened?

  1. To slow filling
  2. To increase pressure
  3. To filter the water as it enters and leaves the tank
  4. To keep out birds, insects and animals
Show the answer

D. To keep out birds, insects and animals — Contamination often enters through vents and hatches.

Question 4 · Water Distribution Class I

What does thermal stratification in a storage tank cause?

  1. Better mixing throughout the tank, with fresher water and higher residual everywhere
  2. Better water quality
  3. Poor mixing, with older water and lost residual in parts of the tank
  4. Better mixing, with fresher water and higher residual throughout
Show the answer

C. Poor mixing, with older water and lost residual in parts of the tank — Mixing systems help.

Question 5 · Water Distribution Class I

What should be checked during a routine storage tank inspection?

  1. Only the outside paint color and the water level gauge
  2. Only the water level
  3. Only the outside paint color, the logo on the tank and the reading on the level gauge
  4. Hatches, vents, screens, overflow, coatings, corrosion and signs of intrusion
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D. Hatches, vents, screens, overflow, coatings, corrosion and signs of intrusion — Inspect finished water storage facilities.

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