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

WD components: hydrants: 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 · Water Distribution Class I

Why should flushing hydrants not be connected directly to sewers?

  1. It saves water
  2. It increases flow
  3. A direct connection increases flushing flow and saves water
  4. A direct connection could let sewage enter the water system
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D. A direct connection could let sewage enter the water system — Ten States Standards 8.4.1.

Question 2 · Water Distribution Class I

What is a dry-barrel hydrant designed to do in cold climates?

  1. Stay full of water at all times so firefighters get flow faster
  2. Drain after use so water doesn't freeze in the barrel
  3. Measure fire flow
  4. Run continuously
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B. Drain after use so water doesn't freeze in the barrel — The main valve is below the frost line.

Question 3 · Water Distribution Class I

Why should a hydrant be opened fully rather than partly during flushing?

  1. It isn't important
  2. Partly opening a hydrant saves water and gives the same scouring velocity
  3. Partly opening a dry-barrel hydrant saves water and still gives the same scouring velocity in the main
  4. Partly open dry-barrel hydrants can drain through the weep hole and erode the base
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D. Partly open dry-barrel hydrants can drain through the weep hole and erode the base — Open fully, then close slowly.

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