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15 questions
The DWV system is ___________.
a system of piping used to deliver potable water into a building.
a system of piping used to remove waste from a building's fixtures.
the building drain and sewer.
the public sewer and treatment center.
All of the following are examples of fixture drains except ___________.
Floor strainers
basket strainers
PO plugs
vents
A trap should provide a liquid seal of ____________ inches.
1/2 to 1
1 to 2
2 to 4
4 to 6
A ______________ has a built in trap.
sink
lavatory
water closet
bathtub
A grease interceptor is commonly installed in ____________.
restaurants
hospitals
pet grooming shops
beauty salons
The _____________, also called the fixture drain, is the point where wastewater leaves the trap and goes into the drainage piping.
inlet
trap arm
top dip
bottom dip
For a trap to operate properly, the crown weir must be installed ____________ than the ____________ of where the fixture drain enters the vent line.
lower; bottom
lower; top
higher; bottom
higher; top
A homeowner is experiencing a problem with a water closet whose trap seal keeps failing. The water closet is in a powder room that is seldom used. The problem is most likely due to ________________.
momentum
oscillation
evaporation
capillary attraction
A 1/6 elbow fitting will turn a run of pipe by _____________ degrees.
30
60
90
120
________________ bends are not available for cast-iron pipe.
Double 1/4
Short sweep 1/4
Triple 1/4
Long sweep 1/4
_______________ are used to join pipes made of different materials.
Cleanout fittings
Adapters
Sanitary tees
Vent ells
A sanitary combination is a single fitting that combines _______________.
a sanitary tee and a vent ell
an upright wye and a vent branch
an inverted wye and a test tee
a sanitary wye and a 1/8 bend
Combination fittings are used _______________.
to connect horizontal drains with vertical stacks
in place of sanitary tees
to decrease the number of fittings needed
to increase flow resistance
The main horizontal pipe inside a building is called the _______________.
main stack
soil stack
building drain
building sewer
Plumbing codes require that manholes be provided for underground piping except when the piping _______________.
changes direction
is less than 6 inches in diameter
changes grade
is less than 8 inches in diameter
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