BACKFLOW QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED A+
||UPDATED 2025/2026
A double check assembly test and maintenance report shall include all of the
following except?
Answer: Differential pressure relief valve discharge reading
The by-pass line of an approved BFP assembly must contain an approved
assembly of equal?
Answer: Protection
An atmospheric type vacuum breaker shall not be subjected to water pressure
for periods longer than _______ hours?
Answer: 12
It is possible for a perfect vacuum at sea level to raise water in a pipe
approximately?
Answer: 33.9 or 34 feet
What is the most desirable place to install a backflow prevention assembly?
Answer: In an accessible location above ground
Which of the following conditions could result in water contamination
through a cross-connection?
Answer: Turning off service to a multi-story building and allowing the water
supply to drain.
, What is another term that describes water quality as a health hazard resulting
from backflow?
Answer: Contamination
The venturi effect states that when the water velocity within the pipe increases, the
pressure? -ANSWER✔✔Decreases
The degree of hazard is? -ANSWER✔✔Based upon the quality of non potable
water source
backflow may be described as? -ANSWER✔✔Backpressure or back siphonage
The federal law placing responsibility for the protection of the public water supply
on the purveyor of the water is? -ANSWER✔✔Safe drinking water act
How many inches must a pressure type vacuum breaker be installed above all
downstream piping? -ANSWER✔✔12 inches
A double check BFP assembly will protect the potable water supply from? -
ANSWER✔✔NON-Health hazard- Backpressure and Back siphonage
How many inches must an Atmospheric vacuum breaker be installed above all
downstream piping and the highest opening? -ANSWER✔✔6 inches
An atmospheric vacuum breaker is installed to protect against? -
ANSWER✔✔BACKSIPHONAGE- Health hazard OR Non health hazard
conditions
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED A+
||UPDATED 2025/2026
A double check assembly test and maintenance report shall include all of the
following except?
Answer: Differential pressure relief valve discharge reading
The by-pass line of an approved BFP assembly must contain an approved
assembly of equal?
Answer: Protection
An atmospheric type vacuum breaker shall not be subjected to water pressure
for periods longer than _______ hours?
Answer: 12
It is possible for a perfect vacuum at sea level to raise water in a pipe
approximately?
Answer: 33.9 or 34 feet
What is the most desirable place to install a backflow prevention assembly?
Answer: In an accessible location above ground
Which of the following conditions could result in water contamination
through a cross-connection?
Answer: Turning off service to a multi-story building and allowing the water
supply to drain.
, What is another term that describes water quality as a health hazard resulting
from backflow?
Answer: Contamination
The venturi effect states that when the water velocity within the pipe increases, the
pressure? -ANSWER✔✔Decreases
The degree of hazard is? -ANSWER✔✔Based upon the quality of non potable
water source
backflow may be described as? -ANSWER✔✔Backpressure or back siphonage
The federal law placing responsibility for the protection of the public water supply
on the purveyor of the water is? -ANSWER✔✔Safe drinking water act
How many inches must a pressure type vacuum breaker be installed above all
downstream piping? -ANSWER✔✔12 inches
A double check BFP assembly will protect the potable water supply from? -
ANSWER✔✔NON-Health hazard- Backpressure and Back siphonage
How many inches must an Atmospheric vacuum breaker be installed above all
downstream piping and the highest opening? -ANSWER✔✔6 inches
An atmospheric vacuum breaker is installed to protect against? -
ANSWER✔✔BACKSIPHONAGE- Health hazard OR Non health hazard
conditions
