DISTRIBUTION PRACTICE EXAM GRADE 1 & 2 CERTIFICATION ARIZONA EXAM GUIDE: 70+
QUESTIONS AND 100% VERIFIED ANSWERS|GRADED A+ |GUARANTEED PASS!!
1. What event does a continuous positive pressure in a distribution system
prevent?
- answer- a backflow condition
2. Define the term "Backsiphonage"?
- answer- a form of backflow due to a reduction in system pressure which causes
a subsatmospheric 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
- answer- backsiphonage
4. Why must the relief port of a reduced pressure principle backflow prevention
device never be plugged or extended?
- answer- so the device will function as designed
5. 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
- answer- installing a physical separation (air gap) between the two systems
6. A connection between a safe and an unsafe water supply is called a
- answer- cross connection
7. Why is it important to thoroughly flush out a newly installed backflow-
prevention device before testing?
,8.
- answer- to rid the unit of foreign objects and particles
8. How must a pressure vacuum breaker backflow device be installed?
- answer- it must be at least 12 inches above the highest downstream outlet
9. Name the condition in which the pressure in a distribution system is less than
the atmospheric pressure
- answer- backsiphonage
10. What does a backsiphonage condition usually cause?
- answer- reduced pressure or negative pressure on the service or supply side
11. On what item might you find a vacuum breaker?
- answer- an irrigation system
12. What does a double check valve backflow assembly provide effective
protection from?
- answer- both backpressure and backsiphonage of pollution
13. What is the maximum time period between having a backflow device tested
by a certified tester?
- answer- 1 year
14. Which of the following has the greatest potential to cause contamination if a
cross connection occurs?
- answer- a pesticide mixing tank
15. Which statement best describes the operation of a reduced pressure
principal backflow assembly?
, - answer- the relief valve pressure principal backflow assembly
16. Which statement is true about a double check valve backflow assembly?
- answer- a double check valve is not designed to stop backsiphonage of a health
hazard
16. Who is responsible for insuring that water contamination due to a cross
connection does not occur?
- answer- the public water system that is affected by cross connection
18 In general, which of the following groups of materials could best be described
as 'organic compounds'?
- answer- TCE, PCE, and TCA
19. The hydrolysis of chlorine results in the formation of which two main chemical
species?
- answer- hypochlorus acid and hydrochloric acid
20. What are the two main chemical species formed by chlorine in water and
what name are they known for collectively?
- answer- HOCl and OCl-; free available chlorine
21. What is an aqueous solution of hydrogen chloride called?
- answer- hydrochloric acid
22. When chlorine comes in contact with an organic material what carcinogenic
compound may be created?
- answer- trihalomethanes
23. The outlet of a forced ventilation system for a chlorinator room should be
located
- answer- near the floor
24. The 'free chlorine residual' in water is the amount of
- answer- uncombined chlorine that remains in the water after chlorine has
been applied and allowed to react
QUESTIONS AND 100% VERIFIED ANSWERS|GRADED A+ |GUARANTEED PASS!!
1. What event does a continuous positive pressure in a distribution system
prevent?
- answer- a backflow condition
2. Define the term "Backsiphonage"?
- answer- a form of backflow due to a reduction in system pressure which causes
a subsatmospheric 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
- answer- backsiphonage
4. Why must the relief port of a reduced pressure principle backflow prevention
device never be plugged or extended?
- answer- so the device will function as designed
5. 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
- answer- installing a physical separation (air gap) between the two systems
6. A connection between a safe and an unsafe water supply is called a
- answer- cross connection
7. Why is it important to thoroughly flush out a newly installed backflow-
prevention device before testing?
,8.
- answer- to rid the unit of foreign objects and particles
8. How must a pressure vacuum breaker backflow device be installed?
- answer- it must be at least 12 inches above the highest downstream outlet
9. Name the condition in which the pressure in a distribution system is less than
the atmospheric pressure
- answer- backsiphonage
10. What does a backsiphonage condition usually cause?
- answer- reduced pressure or negative pressure on the service or supply side
11. On what item might you find a vacuum breaker?
- answer- an irrigation system
12. What does a double check valve backflow assembly provide effective
protection from?
- answer- both backpressure and backsiphonage of pollution
13. What is the maximum time period between having a backflow device tested
by a certified tester?
- answer- 1 year
14. Which of the following has the greatest potential to cause contamination if a
cross connection occurs?
- answer- a pesticide mixing tank
15. Which statement best describes the operation of a reduced pressure
principal backflow assembly?
, - answer- the relief valve pressure principal backflow assembly
16. Which statement is true about a double check valve backflow assembly?
- answer- a double check valve is not designed to stop backsiphonage of a health
hazard
16. Who is responsible for insuring that water contamination due to a cross
connection does not occur?
- answer- the public water system that is affected by cross connection
18 In general, which of the following groups of materials could best be described
as 'organic compounds'?
- answer- TCE, PCE, and TCA
19. The hydrolysis of chlorine results in the formation of which two main chemical
species?
- answer- hypochlorus acid and hydrochloric acid
20. What are the two main chemical species formed by chlorine in water and
what name are they known for collectively?
- answer- HOCl and OCl-; free available chlorine
21. What is an aqueous solution of hydrogen chloride called?
- answer- hydrochloric acid
22. When chlorine comes in contact with an organic material what carcinogenic
compound may be created?
- answer- trihalomethanes
23. The outlet of a forced ventilation system for a chlorinator room should be
located
- answer- near the floor
24. The 'free chlorine residual' in water is the amount of
- answer- uncombined chlorine that remains in the water after chlorine has
been applied and allowed to react
