DISTRIBUTION PRACTICE EXAM
GRADE 1 & 2 CERTIFICATION ARIZONA
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT!!!
1. What event does a continuous positive pressure in a distribution system
prevent?
A) A backflow condition
B) A vacuum condition
C) A cross-connection
Answer: A) A backflow condition
2. Define the term "Backsiphonage"?
A) A form of backflow caused by a reduction in system pressure, leading to
subatmospheric pressure in the water system
B) A condition that occurs due to backpressure in the system
C) The prevention of water flow reversal due to pressure regulation
Answer: A) A form of backflow due to a reduction in system pressure which
causes a subatmospheric pressure to exist at the site in the water system
3. Reverse water flow in a distribution system caused by a vacuum in a water
supply main is called?
A) Backpressure
B) Backflow
C) Backsiphonage
Answer: C) Backsiphonage
4. Why must the relief port of a reduced pressure principle backflow
prevention device never be plugged or extended?
A) To ensure the device functions as designed
B) To prevent contamination of the water supply
,C) To maintain proper water flow
Answer: A) So the device will function as designed
In instances where non-potable water or toxic wastes are connected directly with
potable water systems, the preferred method of correction for such a cross
connection is by
installing a physical separation (air gap) between the two systems
3 multiple choice options
A connection between a safe and an unsafe water supply is called a
cross connection
3 multiple choice options
Why is it important to thoroughly flush out a newly installed backflow-prevention
device before testing?
to rid the unit of foreign objects and particles
3 multiple choice options
How must a pressure vacuum breaker backflow device be installed?
it must be at least 12 inches above the highest downstream outlet
3 multiple choice options
,Name the condition in which the pressure in a distribution system is less than the
atmospheric pressure
backsiphonage
3 multiple choice options
What does a backsiphonage condition usually cause?
reduced pressure or negative pressure on the service or supply side
3 multiple choice options
On what item might you find a vacuum breaker?
an irrigation system
3 multiple choice options
What does a double check valve backflow assembly provide effective protection
from?
both backpressure and backsiphonage of pollution
What is the maximum time period between having a backflow device tested by a
certified tester?
1 year
3 multiple choice options
, Which of the following has the greatest potential to cause contamination if a cross
connection occurs?
a pesticide mixing tank
3 multiple choice options
Which statement best describes the operation of a reduced pressure principal
backflow assembly?
the relief valve pressure principal backflow assembly
3 multiple choice options
Which statement is true about a double check valve backflow assembly?
a double check valve is not designed to stop backsiphonage of a health hazard
3 multiple choice options
Who is responsible for insuring that water contamination due to a cross connection
does not occur?
the public water system that is affected by cross connection
3 multiple choice options
In general, which of the following groups of materials could best be described as
'organic compounds'?
TCE, PCE, and TCA
GRADE 1 & 2 CERTIFICATION ARIZONA
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT!!!
1. What event does a continuous positive pressure in a distribution system
prevent?
A) A backflow condition
B) A vacuum condition
C) A cross-connection
Answer: A) A backflow condition
2. Define the term "Backsiphonage"?
A) A form of backflow caused by a reduction in system pressure, leading to
subatmospheric pressure in the water system
B) A condition that occurs due to backpressure in the system
C) The prevention of water flow reversal due to pressure regulation
Answer: A) A form of backflow due to a reduction in system pressure which
causes a subatmospheric pressure to exist at the site in the water system
3. Reverse water flow in a distribution system caused by a vacuum in a water
supply main is called?
A) Backpressure
B) Backflow
C) Backsiphonage
Answer: C) Backsiphonage
4. Why must the relief port of a reduced pressure principle backflow
prevention device never be plugged or extended?
A) To ensure the device functions as designed
B) To prevent contamination of the water supply
,C) To maintain proper water flow
Answer: A) So the device will function as designed
In instances where non-potable water or toxic wastes are connected directly with
potable water systems, the preferred method of correction for such a cross
connection is by
installing a physical separation (air gap) between the two systems
3 multiple choice options
A connection between a safe and an unsafe water supply is called a
cross connection
3 multiple choice options
Why is it important to thoroughly flush out a newly installed backflow-prevention
device before testing?
to rid the unit of foreign objects and particles
3 multiple choice options
How must a pressure vacuum breaker backflow device be installed?
it must be at least 12 inches above the highest downstream outlet
3 multiple choice options
,Name the condition in which the pressure in a distribution system is less than the
atmospheric pressure
backsiphonage
3 multiple choice options
What does a backsiphonage condition usually cause?
reduced pressure or negative pressure on the service or supply side
3 multiple choice options
On what item might you find a vacuum breaker?
an irrigation system
3 multiple choice options
What does a double check valve backflow assembly provide effective protection
from?
both backpressure and backsiphonage of pollution
What is the maximum time period between having a backflow device tested by a
certified tester?
1 year
3 multiple choice options
, Which of the following has the greatest potential to cause contamination if a cross
connection occurs?
a pesticide mixing tank
3 multiple choice options
Which statement best describes the operation of a reduced pressure principal
backflow assembly?
the relief valve pressure principal backflow assembly
3 multiple choice options
Which statement is true about a double check valve backflow assembly?
a double check valve is not designed to stop backsiphonage of a health hazard
3 multiple choice options
Who is responsible for insuring that water contamination due to a cross connection
does not occur?
the public water system that is affected by cross connection
3 multiple choice options
In general, which of the following groups of materials could best be described as
'organic compounds'?
TCE, PCE, and TCA
