249 Pennsylvania (Philadelphia) Master Plumber Practice Exam
100 Questions | Based on Philadelphia Plumbing Code, IPC, and PA Regulations
According to the Philadelphia Plumbing Code, what is the minimum size for a building
sewer serving a single-family dwelling?
a) 3 inches
b) 4 inches
c) 6 inches
d) 8 inches
ANSWER: b) 4 inches
EXPLANATION: Philadelphia Plumbing Code requires minimum 4-inch diameter for
building sewers.
In Philadelphia, what is the required minimum trap size for a kitchen sink?
a) 1¼ inches
b) 1½ inches
c) 2 inches
d) 3 inches
ANSWER: b) 1½ inches
EXPLANATION: Minimum 1½-inch trap required for kitchen sinks per Philadelphia code.
According to PA Act 31, who can perform plumbing work in Philadelphia without a license?
a) Homeowners on their own property
b) General contractors
c) No one - license always required
d) Maintenance workers for minor repairs
ANSWER: a) Homeowners on their own property
,EXPLANATION: PA Act 31 allows homeowners to do plumbing work on their own single-
family residence.
What is the maximum fixture unit load for a 3-inch horizontal drain pipe at ¼-inch slope?
a) 20 fixture units
b) 42 fixture units
c) 60 fixture units
d) 80 fixture units
ANSWER: b) 42 fixture units
EXPLANATION: IPC Table 710.1(2): 3-inch pipe at ¼" slope carries 42 fixture units.
According to Philadelphia code, what is the minimum vertical distance between a water
pipe and a sewer pipe when crossing?
a) 6 inches
b) 12 inches
c) 18 inches
d) 24 inches
ANSWER: b) 12 inches
EXPLANATION: Water pipes must cross at least 12 inches above sewer pipes in
Philadelphia.
What is the required minimum number of water closets for a restaurant with 50 seats in
Philadelphia?
a) 1
b) 2
c) 3
d) 4
,ANSWER: c) 3
EXPLANATION: Philadelphia requires 1 fixture per 20 seats for first 40, then 1 per 40
additional: 2 for 40 + 1 = 3.
According to the International Plumbing Code, what is the maximum developed length for a
1½-inch vent?
a) 50 feet
b) 75 feet
c) 100 feet
d) 150 feet
ANSWER: d) 150 feet
EXPLANATION: IPC Table 906.1 allows 150 feet maximum for 1½-inch vent.
In Philadelphia, what is the minimum pressure required at fixtures?
a) 8 psi
b) 15 psi
c) 20 psi
d) 30 psi
ANSWER: c) 20 psi
EXPLANATION: Philadelphia requires minimum 20 psi at fixtures during maximum demand.
What type of backflow preventer is required for boiler make-up water lines in Philadelphia?
a) Atmospheric vacuum breaker
b) Pressure vacuum breaker
c) Double check valve assembly
d) Reduced pressure zone device
ANSWER: d) Reduced pressure zone device
, EXPLANATION: RPZ required for high hazard connections like boilers in Philadelphia.
According to Philadelphia code, what is the maximum horizontal distance from a trap to its
vent?
a) 3 feet
b) 5 feet
c) 8 feet
d) 10 feet
ANSWER: b) 5 feet
EXPLANATION: Maximum trap-to-vent distance is 5 feet for 1¼-2" drains in Philadelphia.
What is the minimum size for a main vent stack serving 100 fixture units?
a) 2 inches
b) 3 inches
c) 4 inches
d) 5 inches
ANSWER: b) 3 inches
EXPLANATION: IPC Table 916.1: 3-inch vent serves up to 180 fixture units.
According to Philadelphia regulations, how often must backflow preventers be tested?
a) Monthly
b) Quarterly
c) Annually
d) Every 3 years
ANSWER: c) Annually
EXPLANATION: Annual testing required for all backflow prevention devices in Philadelphia.
100 Questions | Based on Philadelphia Plumbing Code, IPC, and PA Regulations
According to the Philadelphia Plumbing Code, what is the minimum size for a building
sewer serving a single-family dwelling?
a) 3 inches
b) 4 inches
c) 6 inches
d) 8 inches
ANSWER: b) 4 inches
EXPLANATION: Philadelphia Plumbing Code requires minimum 4-inch diameter for
building sewers.
In Philadelphia, what is the required minimum trap size for a kitchen sink?
a) 1¼ inches
b) 1½ inches
c) 2 inches
d) 3 inches
ANSWER: b) 1½ inches
EXPLANATION: Minimum 1½-inch trap required for kitchen sinks per Philadelphia code.
According to PA Act 31, who can perform plumbing work in Philadelphia without a license?
a) Homeowners on their own property
b) General contractors
c) No one - license always required
d) Maintenance workers for minor repairs
ANSWER: a) Homeowners on their own property
,EXPLANATION: PA Act 31 allows homeowners to do plumbing work on their own single-
family residence.
What is the maximum fixture unit load for a 3-inch horizontal drain pipe at ¼-inch slope?
a) 20 fixture units
b) 42 fixture units
c) 60 fixture units
d) 80 fixture units
ANSWER: b) 42 fixture units
EXPLANATION: IPC Table 710.1(2): 3-inch pipe at ¼" slope carries 42 fixture units.
According to Philadelphia code, what is the minimum vertical distance between a water
pipe and a sewer pipe when crossing?
a) 6 inches
b) 12 inches
c) 18 inches
d) 24 inches
ANSWER: b) 12 inches
EXPLANATION: Water pipes must cross at least 12 inches above sewer pipes in
Philadelphia.
What is the required minimum number of water closets for a restaurant with 50 seats in
Philadelphia?
a) 1
b) 2
c) 3
d) 4
,ANSWER: c) 3
EXPLANATION: Philadelphia requires 1 fixture per 20 seats for first 40, then 1 per 40
additional: 2 for 40 + 1 = 3.
According to the International Plumbing Code, what is the maximum developed length for a
1½-inch vent?
a) 50 feet
b) 75 feet
c) 100 feet
d) 150 feet
ANSWER: d) 150 feet
EXPLANATION: IPC Table 906.1 allows 150 feet maximum for 1½-inch vent.
In Philadelphia, what is the minimum pressure required at fixtures?
a) 8 psi
b) 15 psi
c) 20 psi
d) 30 psi
ANSWER: c) 20 psi
EXPLANATION: Philadelphia requires minimum 20 psi at fixtures during maximum demand.
What type of backflow preventer is required for boiler make-up water lines in Philadelphia?
a) Atmospheric vacuum breaker
b) Pressure vacuum breaker
c) Double check valve assembly
d) Reduced pressure zone device
ANSWER: d) Reduced pressure zone device
, EXPLANATION: RPZ required for high hazard connections like boilers in Philadelphia.
According to Philadelphia code, what is the maximum horizontal distance from a trap to its
vent?
a) 3 feet
b) 5 feet
c) 8 feet
d) 10 feet
ANSWER: b) 5 feet
EXPLANATION: Maximum trap-to-vent distance is 5 feet for 1¼-2" drains in Philadelphia.
What is the minimum size for a main vent stack serving 100 fixture units?
a) 2 inches
b) 3 inches
c) 4 inches
d) 5 inches
ANSWER: b) 3 inches
EXPLANATION: IPC Table 916.1: 3-inch vent serves up to 180 fixture units.
According to Philadelphia regulations, how often must backflow preventers be tested?
a) Monthly
b) Quarterly
c) Annually
d) Every 3 years
ANSWER: c) Annually
EXPLANATION: Annual testing required for all backflow prevention devices in Philadelphia.
