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Backflow Prevention Assembly Tester — Practice Exam

Installation: practice questions

Our Backflow Tester bank has 16 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

Why does an RP need an air gap at its relief valve drain?

  1. To measure flow
  2. To cool the relief valve when it discharges hot water
  3. To keep the drain line warm
  4. So the drain line can't back up into the relief valve
Show the answer

D. So the drain line can't back up into the relief valve — An air gap drain funnel is common.

Question 2

What should be considered when installing an assembly on a fire line?

  1. Only the meter
  2. Pressure loss, approvals for fire service and impact on sprinkler performance
  3. Only color
  4. Only the color of the assembly's paint
Show the answer

B. Pressure loss, approvals for fire service and impact on sprinkler performance — Fire systems are critical services.

Question 3

Where should a PVB or AVB not be installed?

  1. Where backpressure can occur, or where they would be below downstream outlets
  2. On irrigation systems
  3. On potable water
  4. Outdoors, or on lawn irrigation systems
Show the answer

A. Where backpressure can occur, or where they would be below downstream outlets — They are for backsiphonage only.

Question 4

Why should vacuum breakers not be installed where fumes or chemicals could be drawn into the air inlet?

  1. They don't take in air at any time
  2. They don't take in any air at any time during normal operation
  3. Contaminated air or splashes could enter the water when the inlet opens
  4. It improves flow
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C. Contaminated air or splashes could enter the water when the inlet opens — Location is a listed special condition.

Question 5

Why should the relief port of an RP not be plugged?

  1. It improves flow
  2. It stops leaks safely and keeps the floor dry
  3. It stops relief leaks safely and keeps the floor around the assembly dry
  4. Plugging it defeats the assembly's main safety feature
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D. Plugging it defeats the assembly's main safety feature — The zone must vent to atmosphere.

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