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Arizona Water Treatment Operator Certification Exam
– Grade 2||VERIFIED QUESTIONS AND VERIFIED
ANSWERS WITH RATIONALES!!!
A continuous positive pressure in a distribution system is
essential for preventing what? - Answer-A backflow event
Most common causes of public water supply
contamination - Answer-Backflow or cross connection
What does a backsiphonage condition usually cause? -
Answer-Reduced pressure on the service or supply side.
What does a double check valve backflow assembly
provide effective protection from? - Answer-Backpressure
and backsiphonage of pollution
What is the maximum time period between having a
backflow device tested by a certified backflow tester? -
Answer-1 year
What is the regulatory definition of a cross connection in a
water supply? - Answer-A physical connection between a
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public water system and any source of water or other
substance that may lead to contamination of the water
provided to the public water system through backflow.
What is backsiphonage? - Answer-A reversal of normal
flow in a system caused by a negative pressure in the
supply piping.
What is backflow? - Answer-Unwanted flow of water in the
reverse direction.
What is head? - Answer-The vertical distance, height, or
energy of water above a reference point. A head of water
may be measured in either height or pressure.
What type of valve reduces the differential pressure across
a closed disk, making the main valve easier to open and
close? - Answer-Bypass valve
Cl2 gas entering the throat triggers stricture in the throat.
At this point, the victim must attempt to do what 2 things? -
Answer-1. Get out of the area of the leak, proceeding
upwind
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2. Take only very short breaths through the mouth. Normal
breathing causes coughing, which must be prevented if
possible.
What symptoms can chlorine gas cause? - Answer-
Suffocation, constriction of the chest, tightness in the
throat, and edema of the lungs.
Free available chlorine is good at killing what? - Answer-
Bacteria
How should an operator store an empty chlorine cylinder?
- Answer-Upright, tagged as empty.
Chronic exposure to low concentrations of chlorine gas
corrodes what body part? - Answer-Teeth
What is the process that changes water vapor to droplets
or ice crystals? - Answer-Condensation.
Unit of measurement for sound - Answer-Decibels
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What happens if grease comes in contact with the winding
of a motor? - Answer-The winding insulation my
deteriorate.
What is turbidity? - Answer-cloudiness of water
What is the most common type of valve used for isolating
a small or medium sized section of a distribution system? -
Answer-Gate valve
What is a possible result of over-greasing a bearing? -
Answer-There is extreme friction in the bearing chamber,
causing heat and scoring of the shaft.
How many pounds is 1 gal of water? - Answer-8.34 lbs
How many gallons is one cubic foot of water? - Answer-
7.48 gallons?
How many feet of water has 1 psi of head pressure? -
Answer-2.31 ft
Arizona Water Treatment Operator Certification Exam
– Grade 2||VERIFIED QUESTIONS AND VERIFIED
ANSWERS WITH RATIONALES!!!
A continuous positive pressure in a distribution system is
essential for preventing what? - Answer-A backflow event
Most common causes of public water supply
contamination - Answer-Backflow or cross connection
What does a backsiphonage condition usually cause? -
Answer-Reduced pressure on the service or supply side.
What does a double check valve backflow assembly
provide effective protection from? - Answer-Backpressure
and backsiphonage of pollution
What is the maximum time period between having a
backflow device tested by a certified backflow tester? -
Answer-1 year
What is the regulatory definition of a cross connection in a
water supply? - Answer-A physical connection between a
,2|Page
public water system and any source of water or other
substance that may lead to contamination of the water
provided to the public water system through backflow.
What is backsiphonage? - Answer-A reversal of normal
flow in a system caused by a negative pressure in the
supply piping.
What is backflow? - Answer-Unwanted flow of water in the
reverse direction.
What is head? - Answer-The vertical distance, height, or
energy of water above a reference point. A head of water
may be measured in either height or pressure.
What type of valve reduces the differential pressure across
a closed disk, making the main valve easier to open and
close? - Answer-Bypass valve
Cl2 gas entering the throat triggers stricture in the throat.
At this point, the victim must attempt to do what 2 things? -
Answer-1. Get out of the area of the leak, proceeding
upwind
,3|Page
2. Take only very short breaths through the mouth. Normal
breathing causes coughing, which must be prevented if
possible.
What symptoms can chlorine gas cause? - Answer-
Suffocation, constriction of the chest, tightness in the
throat, and edema of the lungs.
Free available chlorine is good at killing what? - Answer-
Bacteria
How should an operator store an empty chlorine cylinder?
- Answer-Upright, tagged as empty.
Chronic exposure to low concentrations of chlorine gas
corrodes what body part? - Answer-Teeth
What is the process that changes water vapor to droplets
or ice crystals? - Answer-Condensation.
Unit of measurement for sound - Answer-Decibels
, 4|Page
What happens if grease comes in contact with the winding
of a motor? - Answer-The winding insulation my
deteriorate.
What is turbidity? - Answer-cloudiness of water
What is the most common type of valve used for isolating
a small or medium sized section of a distribution system? -
Answer-Gate valve
What is a possible result of over-greasing a bearing? -
Answer-There is extreme friction in the bearing chamber,
causing heat and scoring of the shaft.
How many pounds is 1 gal of water? - Answer-8.34 lbs
How many gallons is one cubic foot of water? - Answer-
7.48 gallons?
How many feet of water has 1 psi of head pressure? -
Answer-2.31 ft
