Q209 DWV Systems (02111)

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