BACKFLOW PREVENTION ASSEMBLY
Exam Solved Questions With
Revised Correct Detailed Answers
1. A PVB may be installed with
(A) A pump downstream
(B) A water heater downstream
(C) A shutoff valve downstream
(D) An eievated storage tank downstream - ANSWER
downstream
A shutoff...
1. A PVB may be installed with
(A) A pump downstream
(B) A water heater downstream
(C) A shutoff valve downstream
(D) An eievated storage tank downstream - ANSWER A shutoff valve
downstream
2. The relief valve of a Reduced Pressure Principle Assmbly remains closed during
normal operation due to
(A) Supply side pressure
(B) The relief valve spring
(C) Zone pressure
(D) All the above - ANSWER The relief valve spring
3. What would cause a continual flow of water from of water the air inlet of a PVB
prior strting the field test
(A) #2 shut off leaking by with baclpressure
(B) Fouled ckeck valve
(C) #1 shull off leaking by
,(D) Fouled air inlet - ANSWER Fouled air inlet
4. A PVB can be installed in the following conditions
(A) Backpressure
(B) Backsiphonage
(C) B and D
(D) Pollutants and Contaminants - ANSWER B Backsiphonage and D Pollutants
and Contaminants
5. When testing the check valve ob a SVB the water will not stop flowing What is
the most probabie cause
(A) #2 shut off valve leaks by
(B) #1 shut off valve leaks by
(C) check valve is fouled
(D) None of the above - ANSWER #1 shut off valve leaks by
6. Which of the following could cause a closed system if installed in the sevice
line
(A) Hose bibb
(B) Backflow Prevention Assembly
(C) venturi
(D) T & P valve - ANSWER Backflow Prevention Assembly
7. The critical level when testing the SVB is
(A) At the air inlet
,(B) At the #1 shutoff valve
(C) At the vent screw
(D) there is on critical level - ANSWER At the vent screw
8. During the test of the check valve on a Pvb water continues to flow from the
#2 test cock What is the most probabie
(A) Leaking #1 shut off valve
(B) Fouied air inlet
(C) Fouied ckeck valve
(D) Incorrect test procedure - ANSWER Leaking #1 shut off valve
9. Which of the following backflow assmblies are allowable for use against a
contaminant when the backflow could be caused by backpressure
(A) Atmospheric vacuum breaker
(B) Doubie check valve assembly
(C) Pressure vacuum breaker assembly
10. While testing a backflow device under the influence of direct cross connection
it is observed that the hazard preset is a pollutant Which assembly is appropriate
for protection
(A) AVB , PVB , Air Gap
(B) RP , DC , SVB
(C) Air Gap , RP , DC
(D) Barometric Loop - ANSWER Air Gap , RP , DC
, 11. How many test cocks are required on a RP
(A) 1
(B) 2
(C) 3
(D) 4 - ANSWER 4
12. What is the primary consideration when deciding whether ro install a DC or a
RP
(A) Available space
(B) Cost
(C) Degree of hazard
(D) Available of a floor drain - ANSWER Degree of hazard
13. A perfect vacuum at sea level will raise the water level in the pipe maximum
of
(A) 14.7 feet
(B) 2.31 feet
(C) 33.9 feet
(D) 23.1 feel - ANSWER 33.9 feet
14. An undersized water supply line carrying water at a high velocity
(A) Creates high pressure
(B) Creates no problem at all
(C) May cause backsiphonage due to the aspirator effect
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