7-11.
7-12.
7-13.
7-14.
7-15.
7-16.
7-17.
This valve is well suited for use
when a regulated flow is required.
1. A
2. B
3. C
This valve must be operated in the
fully open position.
1. A
2. B
3. C
This valve is
backflow in a
1. A
2. B
3. C
used to prevent
pipeline.
On water mains, thrust blocks
should be installed for what
purpose?
1.
To prevent pipe displacement
caused by high water pressure
2.
To prevent pipe ruptures caused
by high water pressure
3.
To prevent sagging due to the
weight of the piping material
4.
To prevent sagging due to the
weight of the pipe and the
water contained in the pipe
Which of the following types of
piping is becoming increasingly
popular for use in underground
sanitary sewage systems?
1.
Cast iron
2.
polyvinyl chloride
3.
Concrete
4.
Wrought iron
To make a 22 l/2-degree change in
pipe direction, what cast-iron
fitting should you use?
1.
Combination Y and 1/8 bend
2.
1/4 bend
3.
Short sweep 1/4 bend
4.
1/16 bend
What fittings are used in waste
pipe systems to catch and hold
water, thereby forming a seal to
prevent sewer gases from backing up
into a building?
1.
Traps
2.
Street ells
3.
Valves
7-18.
7-19.
7-20.
In what way, if any, do waste
stacks differ from soil stacks?
1.
Waste stacks carry human waste,
soil stacks do not
2.
Soil stacks carry human waste,
waste stacks do not
3.
Waste stacks empty into
building drains, soil stacks
empty into building sewers
4.
None
Under most local codes, what is the
minimum distance that a building
drain must extend beyond the
building wall?
1.
2 ft
2.
3 ft
3.
6 ft
4.
10 ft
In a plumbing plan, which of the
following symols should be used
for a hot-water line?
1.
2.
3.
4.
7-21.
What symbol should you use to show
a screwed joint in a piping plan?
4.
All of the above
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