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Backflow Practice Exam Questions and
Answers 100% Pass
1) Backflow is the undesirable reversal of flow of water or other substances through a cross
connection into the public water system or consumer's: - ANS C. Public water system or
consumer's portable water system
2) An approved airgap (AG) is a physical separation between the free-flowing end of a: -
ANS D. Potable water supply pipe line in the overflow rim of an open or non-pressurized
receiving vessel
3) And indirect cross-connection is one that is subject to what type of backflow? - ANS A.
Only backsiphonage
4 )Cross-connections with between the portable water piping in any piping or containers
containing substances not approved as potable water must be either eliminated or controlled
by the installation of an: - ANS D. Approved air gap or an approved backflow prevention
assembly
5) While testing CV #2 of a DCVA if CV #2 leaks the BAT would observe that the water flow: -
ANS D. Stops from the site tube at TC#4 and no differential shows on the gauge
6) Service protection is a way to protect a public water system from contamination due to back
flow from the customer's water system by the installing an approved backflow preventer at the:
- ANS A. Service connection which is considered to be at or near the water meter
, ©THESTAR 2025 ALL RIGHTS RESERVED
7) A Washington state certified Backflow Assembly Tester is certified to: - ANS D. Inspect,
test and monitor backflow prevention assemblies
8) The RPBA is designed so that if the check valve leaks, the relief with valve may: - ANS B.
Open to discharge through the relief valve vent
9) An AG installed in lieu of an approved backflow prevention assembly must be inspected for
compliance with the definition of an improved air gap by: - ANS C. Either a CCS or a BAT
10) After testing an approved backflow prevention assembly the BAT shall complete a test
report that is acceptable to the: - ANS C. Purveyor
11) The gauge on a differential pressure test kit indicates: - ANS C. psid
12) Loading a check valve with springs or weights: - ANS C. Reduces pressure down stream of
the check valve
13) If there is flow across CV#1 and through an RPBA the relief valve will not discharge unless: -
ANS C. The relief valve is defective
14) Microbiological contaminates entering the portible water system are always a: - ANS A.
High-health standard
15) All approved backflow prevention assemblies must be tested with a: - ANS D. Differential
pressure test kit
16) An approved backflow prevention assembly is an: - ANS C. RPBA, RPDA, DCVA, DCDA,
PVBA, or SVBA of make, model, and size that is approved by the DOH
Backflow Practice Exam Questions and
Answers 100% Pass
1) Backflow is the undesirable reversal of flow of water or other substances through a cross
connection into the public water system or consumer's: - ANS C. Public water system or
consumer's portable water system
2) An approved airgap (AG) is a physical separation between the free-flowing end of a: -
ANS D. Potable water supply pipe line in the overflow rim of an open or non-pressurized
receiving vessel
3) And indirect cross-connection is one that is subject to what type of backflow? - ANS A.
Only backsiphonage
4 )Cross-connections with between the portable water piping in any piping or containers
containing substances not approved as potable water must be either eliminated or controlled
by the installation of an: - ANS D. Approved air gap or an approved backflow prevention
assembly
5) While testing CV #2 of a DCVA if CV #2 leaks the BAT would observe that the water flow: -
ANS D. Stops from the site tube at TC#4 and no differential shows on the gauge
6) Service protection is a way to protect a public water system from contamination due to back
flow from the customer's water system by the installing an approved backflow preventer at the:
- ANS A. Service connection which is considered to be at or near the water meter
, ©THESTAR 2025 ALL RIGHTS RESERVED
7) A Washington state certified Backflow Assembly Tester is certified to: - ANS D. Inspect,
test and monitor backflow prevention assemblies
8) The RPBA is designed so that if the check valve leaks, the relief with valve may: - ANS B.
Open to discharge through the relief valve vent
9) An AG installed in lieu of an approved backflow prevention assembly must be inspected for
compliance with the definition of an improved air gap by: - ANS C. Either a CCS or a BAT
10) After testing an approved backflow prevention assembly the BAT shall complete a test
report that is acceptable to the: - ANS C. Purveyor
11) The gauge on a differential pressure test kit indicates: - ANS C. psid
12) Loading a check valve with springs or weights: - ANS C. Reduces pressure down stream of
the check valve
13) If there is flow across CV#1 and through an RPBA the relief valve will not discharge unless: -
ANS C. The relief valve is defective
14) Microbiological contaminates entering the portible water system are always a: - ANS A.
High-health standard
15) All approved backflow prevention assemblies must be tested with a: - ANS D. Differential
pressure test kit
16) An approved backflow prevention assembly is an: - ANS C. RPBA, RPDA, DCVA, DCDA,
PVBA, or SVBA of make, model, and size that is approved by the DOH
