MASTER PLUMBING WSSC QUESTIONS WITH COMPLETE SOLUTIONS
100% VERIFIED GRADED A+ 2025
Who is responsible for maintaining the plumbing system in a safe condition? -
(answer)The owner or owner's agent is responsible.
Before work commences when must a permit be obtained? - (answer)A permit must be
obtained or a 100% (Double the normal fee) will be charged.
Underground Piping - (answer)All underground piping shall be left uncovered until
inspected.
Inspector's Authority - (answer)The inspector has authority to stop work being done
dangerously or unsafely.
Air Gap - (answer)The vertical distance between the opening of the water supply and
flood level rim of a receptacle.
Branch - (answer)Any part of the piping system except mains, stacks or risers.
Branch Vent - (answer)A vent connecting individual vents with a stack vent or vent
stack.
Building Drain - (answer)The lowest part of a drainage system which receives waste
from soil and waste pipes and connects to the building sewer.
Building Sewer - (answer)Drainage piping that conveys waste from the building drain to
the public sewer or disposal system.
Cleanout - (answer)Access opening in the drainage system used to remove
obstructions.
Combination Fixture - (answer)Two or three compartment sink drained by a continuous
waste connected to one trap.
Combinate Waste and Vent System - (answer)Horizontal wet venting system for sinks
and floor drains.
Common Vent - (answer)A single vent serving as the vent for two fixture drains.
Critical Level - (answer)Is an elevation mark on a vacuum breaker setting the minimum
elevation device can be installed above the flood level rim of a fixture.
Cross Connection - (answer)Is an actual or potential tie between potable water and any
source of pollution or contamination.
, Developed Length - (answer)A measurement of piping taken along the centerline of
pipe and fittings
Drain - (answer)any pipe that conveys waste water in the drainage system.
Indirect Waste - (answer)Waste pipe that drains through an air gap to the drainage
system.
Individual Vent - (answer)A pipe installed to vent a fixture trap. It may connect to the
vent system above the fixture or terminate in the open air.
Main - (answer)Is the primary or principal pipe that drains through an air gap to the
drainage system.
Potable Water - (answer)Is water that is sufficiently free of impurities to meet public
health standards.
Rough In - (answer)Parts of the plumbing system that are installed
prior to the installation of fixtures.
Soil Pipe - (answer)Is drain pipe conveying sewage containing fecal matter.
Stack Vent - (answer)Is the extension of a soil or waste stack above the highest fixture
served.
Trap - (answer)Is a device that provides a water seal to prevent the passage of sewer
gas and allow the passage of waste.
Trap Seal - (answer)Distance from weir to top of the dip of the trap
Vacuum Breaker - (answer)Is a backflow preventer that allows air to a vacuum being
pulled on a system.
Vent Stack - (answer)A vertical vent pipe to provide circulation of air to and from
drainage system
Vertical Pipe - (answer)Pipe that makes an angle of 45 degrees or more with the
horizontal.
No do this - (answer)No dangerous, flammable, poisonous, or explosive liquids shall be
deposited in to the drainage system.
Pipes shall be - (answer)Pipes shall be protected from breakage when passing under or
though walls.
100% VERIFIED GRADED A+ 2025
Who is responsible for maintaining the plumbing system in a safe condition? -
(answer)The owner or owner's agent is responsible.
Before work commences when must a permit be obtained? - (answer)A permit must be
obtained or a 100% (Double the normal fee) will be charged.
Underground Piping - (answer)All underground piping shall be left uncovered until
inspected.
Inspector's Authority - (answer)The inspector has authority to stop work being done
dangerously or unsafely.
Air Gap - (answer)The vertical distance between the opening of the water supply and
flood level rim of a receptacle.
Branch - (answer)Any part of the piping system except mains, stacks or risers.
Branch Vent - (answer)A vent connecting individual vents with a stack vent or vent
stack.
Building Drain - (answer)The lowest part of a drainage system which receives waste
from soil and waste pipes and connects to the building sewer.
Building Sewer - (answer)Drainage piping that conveys waste from the building drain to
the public sewer or disposal system.
Cleanout - (answer)Access opening in the drainage system used to remove
obstructions.
Combination Fixture - (answer)Two or three compartment sink drained by a continuous
waste connected to one trap.
Combinate Waste and Vent System - (answer)Horizontal wet venting system for sinks
and floor drains.
Common Vent - (answer)A single vent serving as the vent for two fixture drains.
Critical Level - (answer)Is an elevation mark on a vacuum breaker setting the minimum
elevation device can be installed above the flood level rim of a fixture.
Cross Connection - (answer)Is an actual or potential tie between potable water and any
source of pollution or contamination.
, Developed Length - (answer)A measurement of piping taken along the centerline of
pipe and fittings
Drain - (answer)any pipe that conveys waste water in the drainage system.
Indirect Waste - (answer)Waste pipe that drains through an air gap to the drainage
system.
Individual Vent - (answer)A pipe installed to vent a fixture trap. It may connect to the
vent system above the fixture or terminate in the open air.
Main - (answer)Is the primary or principal pipe that drains through an air gap to the
drainage system.
Potable Water - (answer)Is water that is sufficiently free of impurities to meet public
health standards.
Rough In - (answer)Parts of the plumbing system that are installed
prior to the installation of fixtures.
Soil Pipe - (answer)Is drain pipe conveying sewage containing fecal matter.
Stack Vent - (answer)Is the extension of a soil or waste stack above the highest fixture
served.
Trap - (answer)Is a device that provides a water seal to prevent the passage of sewer
gas and allow the passage of waste.
Trap Seal - (answer)Distance from weir to top of the dip of the trap
Vacuum Breaker - (answer)Is a backflow preventer that allows air to a vacuum being
pulled on a system.
Vent Stack - (answer)A vertical vent pipe to provide circulation of air to and from
drainage system
Vertical Pipe - (answer)Pipe that makes an angle of 45 degrees or more with the
horizontal.
No do this - (answer)No dangerous, flammable, poisonous, or explosive liquids shall be
deposited in to the drainage system.
Pipes shall be - (answer)Pipes shall be protected from breakage when passing under or
though walls.
