Backflow Practice Exam Questions
and Correct Answers
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: - <CORRECT ANSWER >>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: -
<CORRECT ANSWER >>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? - <CORRECT
ANSWER >>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: - <CORRECT ANSWER >>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: -
<CORRECT ANSWER >>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:
- <CORRECT ANSWER >>A. Service connection which is considered to be at or near the water
meter
7) A Washington state certified Backflow Assembly Tester is certified to: - <CORRECT ANSWER
>>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: - <CORRECT
ANSWER >>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: - <CORRECT ANSWER >>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: - <CORRECT ANSWER >>C. Purveyor
11) The gauge on a differential pressure test kit indicates: - <CORRECT ANSWER >>C. psid
12) Loading a check valve with springs or weights: - <CORRECT ANSWER >>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: -
<CORRECT ANSWER >>C. The relief valve is defective
14) Microbiological contaminates entering the portible water system are always a: - <CORRECT
ANSWER >>A. High-health standard
15) All approved backflow prevention assemblies must be tested with a: - <CORRECT ANSWER
>>D. Differential pressure test kit
16) An approved backflow prevention assembly is an: - <CORRECT ANSWER >>C. RPBA, RPDA,
DCVA, DCDA, PVBA, or SVBA of make, model, and size that is approved by the DOH
17) Permanent support blocks are required under all approved backflow assemblies that are: -
<CORRECT ANSWER >>D. A large size assembly
and Correct Answers
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: - <CORRECT ANSWER >>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: -
<CORRECT ANSWER >>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? - <CORRECT
ANSWER >>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: - <CORRECT ANSWER >>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: -
<CORRECT ANSWER >>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:
- <CORRECT ANSWER >>A. Service connection which is considered to be at or near the water
meter
7) A Washington state certified Backflow Assembly Tester is certified to: - <CORRECT ANSWER
>>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: - <CORRECT
ANSWER >>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: - <CORRECT ANSWER >>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: - <CORRECT ANSWER >>C. Purveyor
11) The gauge on a differential pressure test kit indicates: - <CORRECT ANSWER >>C. psid
12) Loading a check valve with springs or weights: - <CORRECT ANSWER >>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: -
<CORRECT ANSWER >>C. The relief valve is defective
14) Microbiological contaminates entering the portible water system are always a: - <CORRECT
ANSWER >>A. High-health standard
15) All approved backflow prevention assemblies must be tested with a: - <CORRECT ANSWER
>>D. Differential pressure test kit
16) An approved backflow prevention assembly is an: - <CORRECT ANSWER >>C. RPBA, RPDA,
DCVA, DCDA, PVBA, or SVBA of make, model, and size that is approved by the DOH
17) Permanent support blocks are required under all approved backflow assemblies that are: -
<CORRECT ANSWER >>D. A large size assembly
