CROSS CONNECTION CERTIFICATION
EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
CORRECT!!!
1. What is absolute pressure?
A. The pressure on a system measured from zero
B. The total pressure, which is the gauge pressure plus the atmospheric pressure at
a given altitude
C. The pressure exerted by the weight of the water
D. The pressure difference between two points in the system
Answer: B. The total pressure. The gauge pressure plus the atmospheric
pressure at a given altitude.
2. What is an air gap?
A. A physical barrier between two water sources
B. The vertical distance between the lowest point of a pipe and the ground
C. The unobstructed vertical distance through the free atmosphere between the
lowest opening of any pipe or outlet supplying water and the flood-level rim of the
receiving vessel or fixture
D. A filter used to separate contaminants in water
Answer: C. The unobstructed vertical distance through the free atmosphere
between the lowest opening from any pipe or outlet supplying water to a tank,
plumbing fixture, or other device, and the flood-level rim of the non-
pressurized receiving vessel or receptacle.
3. What does "approved" mean in plumbing or backflow prevention?
A. The device is tested and certified
B. The item meets only basic requirements
C. Accepted by the responsible authority, meeting applicable specifications and
standards
D. The product has a warranty
Answer: C. Accepted by the Responsible Authority. Meets applicable
specifications and standards.
,4. What is atmospheric pressure?
A. The pressure inside a vacuum
B. The pressure exerted by the weight of the atmosphere; decreases as elevation
above sea level increases
C. The pressure exerted by a closed container on the surrounding environment
D. The pressure required for backflow prevention
Answer: B. The pressure exerted by the weight of the atmosphere. As the
elevation above sea level increases, the atmospheric pressure decreases.
5. What is an Atmospheric Vacuum Breaker (AVB)?
A. A device designed to prevent backflow due to high pressure
B. A mechanical backflow prevention device that prevents backsiphonage by
allowing air to enter the downstream water line; does not provide protection
against backpressure or continuous pressure
C. A valve used to regulate water pressure
D. A filter used for cleaning water
Answer: B. A mechanical backflow prevention device consisting of a float
check valve and an air inlet port designed to prevent backsiphonage by
allowing air to enter the downstream water line. The unit does not provide
protection against backpressure or continuous pressure. A shut-off valve is
not allowed downstream from the device.
6. What is backflow?
A. The flow of water from a high-pressure system to a low-pressure system
B. The reversed flow of a non-potable source into a potable system because the
pressure on the non-potable side is greater than the pressure on the potable side
C. The normal flow of water in a pressurized system
D. The backflow of clean water into a contaminated source
Answer: B. The reversed flow of a non-potable source into a potable system
because a pressure differential exists where the pressure on the non-potable
side is greater than the pressure on the potable side.
, Backflow prevention assembly -ANSWER✔✔The entire backflow unit, icluding
not only the mechanism that actually prevents backflow, but also the shut-off
valves and test cocks. An assembly has a resilient seated, full-flow shut-off valve
before and after the backflow preventer.
Backflow prevention device -ANSWER✔✔Refers to the backflow prevention
mechanism only. It does not include the shut-off valves located on the inlet and
outlet.
Backflow prevention method -ANSWER✔✔A mechanism for preventing
backflow that includes mechanical backflow prevention assemblies, devices, and
air gaps.
Backpressure -ANSWER✔✔Occurs when the non-potable system's pressure
exceeds the supply pressure
Backsiphonage -ANSWER✔✔Occurs when the supply line pressure falls below
atmospheric pressure causing a partial vacuum in the potable water distribution
system
Barometric loop -ANSWER✔✔a 34 foot vertical loop of piping that prevents
backsiphonage only based on pressure principles
Biological contaminants (high or health hazards) -ANSWER✔✔Agents that cause
disease
Biological pollutants (low or non-health hazards) -ANSWER✔✔Agents that do no
cause disease but that do decrease aesthetic quality of the water
EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
CORRECT!!!
1. What is absolute pressure?
A. The pressure on a system measured from zero
B. The total pressure, which is the gauge pressure plus the atmospheric pressure at
a given altitude
C. The pressure exerted by the weight of the water
D. The pressure difference between two points in the system
Answer: B. The total pressure. The gauge pressure plus the atmospheric
pressure at a given altitude.
2. What is an air gap?
A. A physical barrier between two water sources
B. The vertical distance between the lowest point of a pipe and the ground
C. The unobstructed vertical distance through the free atmosphere between the
lowest opening of any pipe or outlet supplying water and the flood-level rim of the
receiving vessel or fixture
D. A filter used to separate contaminants in water
Answer: C. The unobstructed vertical distance through the free atmosphere
between the lowest opening from any pipe or outlet supplying water to a tank,
plumbing fixture, or other device, and the flood-level rim of the non-
pressurized receiving vessel or receptacle.
3. What does "approved" mean in plumbing or backflow prevention?
A. The device is tested and certified
B. The item meets only basic requirements
C. Accepted by the responsible authority, meeting applicable specifications and
standards
D. The product has a warranty
Answer: C. Accepted by the Responsible Authority. Meets applicable
specifications and standards.
,4. What is atmospheric pressure?
A. The pressure inside a vacuum
B. The pressure exerted by the weight of the atmosphere; decreases as elevation
above sea level increases
C. The pressure exerted by a closed container on the surrounding environment
D. The pressure required for backflow prevention
Answer: B. The pressure exerted by the weight of the atmosphere. As the
elevation above sea level increases, the atmospheric pressure decreases.
5. What is an Atmospheric Vacuum Breaker (AVB)?
A. A device designed to prevent backflow due to high pressure
B. A mechanical backflow prevention device that prevents backsiphonage by
allowing air to enter the downstream water line; does not provide protection
against backpressure or continuous pressure
C. A valve used to regulate water pressure
D. A filter used for cleaning water
Answer: B. A mechanical backflow prevention device consisting of a float
check valve and an air inlet port designed to prevent backsiphonage by
allowing air to enter the downstream water line. The unit does not provide
protection against backpressure or continuous pressure. A shut-off valve is
not allowed downstream from the device.
6. What is backflow?
A. The flow of water from a high-pressure system to a low-pressure system
B. The reversed flow of a non-potable source into a potable system because the
pressure on the non-potable side is greater than the pressure on the potable side
C. The normal flow of water in a pressurized system
D. The backflow of clean water into a contaminated source
Answer: B. The reversed flow of a non-potable source into a potable system
because a pressure differential exists where the pressure on the non-potable
side is greater than the pressure on the potable side.
, Backflow prevention assembly -ANSWER✔✔The entire backflow unit, icluding
not only the mechanism that actually prevents backflow, but also the shut-off
valves and test cocks. An assembly has a resilient seated, full-flow shut-off valve
before and after the backflow preventer.
Backflow prevention device -ANSWER✔✔Refers to the backflow prevention
mechanism only. It does not include the shut-off valves located on the inlet and
outlet.
Backflow prevention method -ANSWER✔✔A mechanism for preventing
backflow that includes mechanical backflow prevention assemblies, devices, and
air gaps.
Backpressure -ANSWER✔✔Occurs when the non-potable system's pressure
exceeds the supply pressure
Backsiphonage -ANSWER✔✔Occurs when the supply line pressure falls below
atmospheric pressure causing a partial vacuum in the potable water distribution
system
Barometric loop -ANSWER✔✔a 34 foot vertical loop of piping that prevents
backsiphonage only based on pressure principles
Biological contaminants (high or health hazards) -ANSWER✔✔Agents that cause
disease
Biological pollutants (low or non-health hazards) -ANSWER✔✔Agents that do no
cause disease but that do decrease aesthetic quality of the water
