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Backflow Prevention Assembly Tester — Practice Exam

Test procedure: practice questions

Our Backflow Tester bank has 22 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

In a DC test, why is the bleed valve or high-side bleed needle opened briefly after connecting the hose?

  1. To drain the assembly before the test begins
  2. To vent air from the hose and gauge
  3. To raise the supply pressure
  4. To raise the reading
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B. To vent air from the hose and gauge — Remove air for accurate readings.

Question 2

What should be done if a leaking shutoff valve prevents a valid test?

  1. Record the test as passed, since the checks can't be tested
  2. Repair the shutoff valve, then test
  3. Skip the assembly
  4. Test it with the valve open
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B. Repair the shutoff valve, then test — LA County: leaking shutoffs that prevent a test must be repaired.

Question 3

Why is the order of test steps important in a field test?

  1. Only for paperwork
  2. Each step relies on conditions set by the previous one, such as a no-flow condition
  3. To save water
  4. It doesn't matter, as long as all readings are taken
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B. Each step relies on conditions set by the previous one, such as a no-flow condition — Follow the approved procedure exactly.

Question 4

LA County warns against checking for a leaking #1 shutoff valve by doing what?

  1. Using a sight tube
  2. Opening a test cock downstream of the second check valve and draining the assembly
  3. Lowering the pressure upstream of the check valve being tested
  4. Tapping the check valve body with a wrench
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C. Lowering the pressure upstream of the check valve being tested — It could cause backflow.

Question 5

What should a tester do if the assembly fails a test?

  1. Report the failure, then repair or have it repaired and retest
  2. Mark it as passed and note the problem for next year
  3. Mark it as passed and add a note on the report so the problem is checked next year
  4. Remove it
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A. Report the failure, then repair or have it repaired and retest — Defective parts must be repaired and retested.

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