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Backflow prevention assembly tester practice test

160 free practice questions for this exam, each with the reason for the answer and where to look it up.

Backflow prevention tester: practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

Practice tests that prepare you for this exam

Backflow prevention tester

Backflow and backsiphonage, assemblies and devices, hazard assessment, field test procedures and troubleshooting for backflow tester certification.

160 questions for this exam

About the exam

ExamBackflow prevention assembly tester
Who runs itASSE 5110, ABPA, AWWA sections
WhereUnited States

Question count, time limit and pass mark differ by where you take it. Check the official candidate bulletin from the organisation that runs your exam.

Sample questions

What is the general minimum size of an air gap, measured vertically above the flood level rim?

  1. Equal to the diameter of the supply outlet's effective opening, and never less than 1 inch
  2. Twice the diameter of the drain outlet of the receptor, and never less than 2 inches
  3. Twice the diameter of the supply outlet's effective opening, and never less than 1 inch
  4. Three times the diameter of the supply pipe upstream, and never less than 6 inches
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C. Twice the diameter of the supply outlet's effective opening, and never less than 1 inch

The basic rule is two times the effective opening of the supply outlet with a 1 inch minimum. A gap equal to one diameter is too small to stop water from bridging during a vacuum.

Reference: ASME A112.1.2 air gap principles; EPA Cross-Connection Control Manual (EPA 816-R-03-002), ch. 4

Installing a backflow prevention assembly on the water service at the meter, to protect the public system from everything on the premises, is called:

  1. isolation
  2. containment
  3. segregation
  4. abatement
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B. containment

Containment (service protection) puts the protection at the service connection so the public main is protected from the whole premises. Isolation protects at individual points of use inside the premises.

Reference: AWWA Manual M14, Backflow Prevention and Cross-Connection Control, service protection

One psi of pressure will support a column of water about how high?

  1. 0.433 ft
  2. 14.7 ft
  3. 33.9 ft
  4. 2.31 ft
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D. 2.31 ft

One psi equals about 2.31 feet of water (1 divided by 0.433). The value 0.433 is psi per foot, the conversion going the other way.

Reference: Hydraulics constants: 2.31 ft of head per psi

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