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BACKFLOW PREVENTION ASSEMBLY
TESTER CERTIFICATION FINAL AND
PRACTICE EXAM|REAL 300+Qs&As
|A+GRADE
Q1. Backflow is defined as:
a) The flow of water from the distribution system to the
customer's piping
b) The unwanted reverse flow of water or other substances from
a customer's piping into the public water system
c) The normal direction of water flow in a distribution system
d) The flow of water through a pressure reducing valve
Correct Answer: b) The unwanted reverse flow of water or
other substances from a customer's piping into the public
water system
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Rationale: Backflow is the reversal of flow, potentially allowing
contaminants to enter the potable water supply. The other options
describe normal flow or unrelated concepts.
Q2. The two types of backflow are:
a) Backpressure and backsiphonage
b) Backsiphonage and backflow
c) Backpressure and reverse pressure
d) Suction and pressure
Correct Answer: a) Backpressure and backsiphonage
Rationale: Backpressure occurs when downstream pressure exceeds
supply pressure (e.g., pump, boiler). Backsiphonage occurs when
supply pressure drops below atmospheric (e.g., water main break,
firefighting).
Q3. A water main break that causes a drop in supply pressure,
allowing contaminated water to be drawn into the system, is an
example of:
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a) Backpressure
b) Backsiphonage
c) Cross-connection
d) Backflow prevention
Correct Answer: b) Backsiphonage
Rationale: A drop in supply pressure creates a partial vacuum,
siphoning water from the customer side back into the main. This is
backsiphonage.
Q4. A cross-connection is:
a) Any actual or potential connection between a potable water
system and a non-potable source
b) A device that prevents backflow
c) A type of pipe fitting
d) A water meter connection
Correct Answer: a) Any actual or potential connection
between a potable water system and a non-potable source
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Rationale: A cross-connection is any arrangement that could allow
non-potable water to enter the potable system. Backflow prevention
devices are used to protect against cross-connections.
Q5. Which of the following is an example of a high-hazard
cross-connection?
a) Garden hose with a spray nozzle
b) Lawn irrigation system with a check valve
c) Boiler feed line with antifreeze additive
d) Residential faucet with an aerator
Correct Answer: c) Boiler feed line with antifreeze additive
Rationale: High-hazard means the contaminant could cause illness
or death. Antifreeze (ethylene glycol or propylene glycol) is a toxic
chemical. Garden hoses and irrigation may be moderate or low
hazard depending on backflow protection.
Q6. The purpose of a backflow prevention assembly is to:
a) Increase water pressure
BACKFLOW PREVENTION ASSEMBLY
TESTER CERTIFICATION FINAL AND
PRACTICE EXAM|REAL 300+Qs&As
|A+GRADE
Q1. Backflow is defined as:
a) The flow of water from the distribution system to the
customer's piping
b) The unwanted reverse flow of water or other substances from
a customer's piping into the public water system
c) The normal direction of water flow in a distribution system
d) The flow of water through a pressure reducing valve
Correct Answer: b) The unwanted reverse flow of water or
other substances from a customer's piping into the public
water system
,Page 2 of 57
Rationale: Backflow is the reversal of flow, potentially allowing
contaminants to enter the potable water supply. The other options
describe normal flow or unrelated concepts.
Q2. The two types of backflow are:
a) Backpressure and backsiphonage
b) Backsiphonage and backflow
c) Backpressure and reverse pressure
d) Suction and pressure
Correct Answer: a) Backpressure and backsiphonage
Rationale: Backpressure occurs when downstream pressure exceeds
supply pressure (e.g., pump, boiler). Backsiphonage occurs when
supply pressure drops below atmospheric (e.g., water main break,
firefighting).
Q3. A water main break that causes a drop in supply pressure,
allowing contaminated water to be drawn into the system, is an
example of:
,Page 3 of 57
a) Backpressure
b) Backsiphonage
c) Cross-connection
d) Backflow prevention
Correct Answer: b) Backsiphonage
Rationale: A drop in supply pressure creates a partial vacuum,
siphoning water from the customer side back into the main. This is
backsiphonage.
Q4. A cross-connection is:
a) Any actual or potential connection between a potable water
system and a non-potable source
b) A device that prevents backflow
c) A type of pipe fitting
d) A water meter connection
Correct Answer: a) Any actual or potential connection
between a potable water system and a non-potable source
, Page 4 of 57
Rationale: A cross-connection is any arrangement that could allow
non-potable water to enter the potable system. Backflow prevention
devices are used to protect against cross-connections.
Q5. Which of the following is an example of a high-hazard
cross-connection?
a) Garden hose with a spray nozzle
b) Lawn irrigation system with a check valve
c) Boiler feed line with antifreeze additive
d) Residential faucet with an aerator
Correct Answer: c) Boiler feed line with antifreeze additive
Rationale: High-hazard means the contaminant could cause illness
or death. Antifreeze (ethylene glycol or propylene glycol) is a toxic
chemical. Garden hoses and irrigation may be moderate or low
hazard depending on backflow protection.
Q6. The purpose of a backflow prevention assembly is to:
a) Increase water pressure
