3-33.
Preliminary cross sections are used
in conjunction with (a) what
sections and (b) for which of the
following purposes?
1.
(a) Final (b) to determine as-
built conditions
2.
(a) As-built (b) to determine
construction errors
3.
(a) Typical (b) to determine
existing material usefulness
4.
(a) finished roadbed (b) to
determine earthwork
requirements
3-34.
Final cross sections show which of
the following information?
1.
Finished elevation
2.
Actual cross-sectional shape of
the curves
3.
Distances of ditches from the
center line
4.
Each of the above
3-35.
When, if ever, should a route be
relocated due to drainage problems?
1.
When planned through a forest
2.
When located in a floodplain
3.
When underground springs are a
mile away
4.
Never
3-36.
Which, if any, of the following
actions should be taken during road
construction to prevent standing
puddles on the roadway?
1.
Slant the worked surface of the
road to provide quicker runoff
2.
Cut ditches outside the
construction limits
3.
Raise the final grade of the
roadway
4.
None of the above
3-37.
A perforated pipe is placed in the
bottom of a trench and backfilled
to a designated depth to lower the
water table. What term describes
this action?
3-38.
You lay out a 50-foot ditch for
subsurface drainage. What is the
minimum grade, in feet, allowed?
1.
0.10
2.
0.15
3.
0.25
4.
0.30
3-39.
Which, if any, of the following
effects does rainfall have on a
roadway?
1.
Cleans the road surface
2.
Erodes the roadway
3.
Weakens road if allowed to
stand
4.
None of the above
3-40.
Your center-line elevation is
0.25 feet higher than the edge of
the road.
What term best describes
this condition?
1.
Superelevation
2.
Drainage
3.
Ditching
4.
Crown
3-41.
Which of the following factors
should you consider when
determining the size and type
of roadway ditches?
1.
Soil types
2.
Lay of the land
3.
Volume of water
4.
Each of the above
3-42.
Which of the following conditions
occur when using a minimum grade
on ditches?
1.
Excessive erosion
2.
Increased water-runoff velocity
3.
Ponding effect
3-43.
The purpose of check dams is to
1.
collect water
2.
slow waters
3.
form ponds
4.
beautify the roaduay
1.
French drain
2.
Trenching
3.
Bleeders
4.
Tile drain
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