MASTER PLUMBING 2026 ACTUAL EXAM QUESTIONS AND
SOLUTIONS RATED A+
✔✔Interconnections between two or more public water supplies shall be permitted only
with the approval of whom? - ✔✔the authority having jurisdiction
✔✔Name the 2 required backflow prevention devices for backsiphonage, non-
continuous pressure, non-health hazard
SAME AS
required backflow prevention devices for back siphonage, non-continuous pressure,
health hazard - ✔✔1. Atmospheric vacuum breaker
2. hose connection vacuum breaker
✔✔Name the 4 required backflow prevention devices for backsiphonage, continuous
pressure, non-health hazard - ✔✔1. pressure vacuum breaker
2. spill-resistant vacuum breaker
3. backflow preventer with intermediate atmospheric port
4. double check valve assembly
✔✔Name the 3 required backflow prevention devices for back siphonage, continuous
pressure, health hazard - ✔✔1. pressure vacuum breaker
2. spill-resistant vacuum breaker
3. reduced pressure back flow preventer assembly
✔✔Name the 3 required backflow prevention devices for back pressure, non-health
hazard - ✔✔1. dual check back flow preventer
2. double check valve assembly
3. reduced pressure back flow preventer assembly
✔✔Name the 1 required backflow prevention device for back pressure, health hazard -
✔✔1. reduced pressure back flow preventer assembly
✔✔Double check valve assemblies, as well as RPZs, must be installed between _____
and ____ inches above the floor or working surface to provide sufficient access for
periodic testing and maintenance. - ✔✔12 inches; 60 inches
✔✔ASSE ______ (the number) pressure vacuum breaker should not be located where
water spillage from the atmospheric vent will cause a nuisance. If necessary, use ASSE
____ spill resistant vacuum breaker. - ✔✔1020 is spillage vacuum breaker; 1056 is spill
resistant vacuum breaker
, ✔✔The minimum separation from a drain and water service in the ground is ____
inches. - ✔✔12 inches
✔✔Combination stop and waste valves or cocks shall not be installed where on water
service piping? - ✔✔underground
✔✔Where water service piping is plastic, the wall sleeve shall not be less than ____
feet long extended outside beyond the wall. - ✔✔5 feet
✔✔When disinfecting and flushing a potable water system, it shall be done with ______
solution. - ✔✔water-chlorine solution
✔✔In regards to disinfecting a potable water system, the following is acceptable: 50
ppm for ____ hours or 200 ppm for ____ hours - ✔✔24 hours at 50 ppm; 3 hours at 200
ppm
✔✔Water distribution piping within buildings shall be sized for a maximum velocity of
___ feet per second unless the manufacturer's sizing recommendations call for the
maximum velocity to be less. - ✔✔8 feet per second
✔✔For sizing purposes, a hose bib produces _____ gallons per minute. - ✔✔5 gpm
✔✔For sizing purposes, a shower produces _____ gallons per minute. - ✔✔2.5 gpm
✔✔For sizing purposes, a flushometer valve for water closets produces _____ gallons
per minute. - ✔✔30 gpm
✔✔What is the longest length of a supply tube feeding a fixture? - ✔✔30 inches
✔✔How do you size the hot water distribution piping? - ✔✔3/4 of the cold side WSFU
value
✔✔____ psi is the highest pressure in a no flow condition for an appliance. - ✔✔80 psi
✔✔Where the discharge rate of fixtures or equipment is expressed in gallons per
minute, ____ DFUs shall be allowed for each gallon per minute of flow. - ✔✔2 DFUs
✔✔Venting systems shall be designed and installed so that at no time will trap seals be
subjected to a pneumatic pressure differential of more than _______ of water column
under design load conditions. - ✔✔1 inch
✔✔A vent stack shall be provided for drainage stacks having ____ or more branch
intervals. - ✔✔5
SOLUTIONS RATED A+
✔✔Interconnections between two or more public water supplies shall be permitted only
with the approval of whom? - ✔✔the authority having jurisdiction
✔✔Name the 2 required backflow prevention devices for backsiphonage, non-
continuous pressure, non-health hazard
SAME AS
required backflow prevention devices for back siphonage, non-continuous pressure,
health hazard - ✔✔1. Atmospheric vacuum breaker
2. hose connection vacuum breaker
✔✔Name the 4 required backflow prevention devices for backsiphonage, continuous
pressure, non-health hazard - ✔✔1. pressure vacuum breaker
2. spill-resistant vacuum breaker
3. backflow preventer with intermediate atmospheric port
4. double check valve assembly
✔✔Name the 3 required backflow prevention devices for back siphonage, continuous
pressure, health hazard - ✔✔1. pressure vacuum breaker
2. spill-resistant vacuum breaker
3. reduced pressure back flow preventer assembly
✔✔Name the 3 required backflow prevention devices for back pressure, non-health
hazard - ✔✔1. dual check back flow preventer
2. double check valve assembly
3. reduced pressure back flow preventer assembly
✔✔Name the 1 required backflow prevention device for back pressure, health hazard -
✔✔1. reduced pressure back flow preventer assembly
✔✔Double check valve assemblies, as well as RPZs, must be installed between _____
and ____ inches above the floor or working surface to provide sufficient access for
periodic testing and maintenance. - ✔✔12 inches; 60 inches
✔✔ASSE ______ (the number) pressure vacuum breaker should not be located where
water spillage from the atmospheric vent will cause a nuisance. If necessary, use ASSE
____ spill resistant vacuum breaker. - ✔✔1020 is spillage vacuum breaker; 1056 is spill
resistant vacuum breaker
, ✔✔The minimum separation from a drain and water service in the ground is ____
inches. - ✔✔12 inches
✔✔Combination stop and waste valves or cocks shall not be installed where on water
service piping? - ✔✔underground
✔✔Where water service piping is plastic, the wall sleeve shall not be less than ____
feet long extended outside beyond the wall. - ✔✔5 feet
✔✔When disinfecting and flushing a potable water system, it shall be done with ______
solution. - ✔✔water-chlorine solution
✔✔In regards to disinfecting a potable water system, the following is acceptable: 50
ppm for ____ hours or 200 ppm for ____ hours - ✔✔24 hours at 50 ppm; 3 hours at 200
ppm
✔✔Water distribution piping within buildings shall be sized for a maximum velocity of
___ feet per second unless the manufacturer's sizing recommendations call for the
maximum velocity to be less. - ✔✔8 feet per second
✔✔For sizing purposes, a hose bib produces _____ gallons per minute. - ✔✔5 gpm
✔✔For sizing purposes, a shower produces _____ gallons per minute. - ✔✔2.5 gpm
✔✔For sizing purposes, a flushometer valve for water closets produces _____ gallons
per minute. - ✔✔30 gpm
✔✔What is the longest length of a supply tube feeding a fixture? - ✔✔30 inches
✔✔How do you size the hot water distribution piping? - ✔✔3/4 of the cold side WSFU
value
✔✔____ psi is the highest pressure in a no flow condition for an appliance. - ✔✔80 psi
✔✔Where the discharge rate of fixtures or equipment is expressed in gallons per
minute, ____ DFUs shall be allowed for each gallon per minute of flow. - ✔✔2 DFUs
✔✔Venting systems shall be designed and installed so that at no time will trap seals be
subjected to a pneumatic pressure differential of more than _______ of water column
under design load conditions. - ✔✔1 inch
✔✔A vent stack shall be provided for drainage stacks having ____ or more branch
intervals. - ✔✔5
