7–39.
Bucket teeth should be reversed or
replaced when the teeth wear down
to approximately what length?
1.
1/2 inich
2.
1
inch
3.
1 1/2 inches
4.
2
inches
7–40.
Which of the following ditchers
is most commonly used in the NCF?
1.
Wheel
2.
Ladder
3.
Chain
4.
Blade
7–41.
Before starting any ditcher
excavation project, the operator
must ensure what type of permit
that covers the area to be
excavated is attained?
1.
Excavation
2.
Ditching
3.
Digging
4.
Trenching
7–42.
The boom on the ladder ditcher
can be brought no closer than
what maximum number of degrees
to the vertical?
1.
15°
2.
25°
3.
35°
4.
45°
7–43.
What component on a ladder ditcher
is used for the major job of
cleaning out and smoothing the
ditch after the teeth have cut
the material?
1.
Bucket teeth
2.
Crumber
3.
Stinger
4.
Conveyor
7-44.
The chain teeth on a chain ditcher
is used to cut and lift the cut
material to the surface.
7-45.
Which of the following ditchers dig
faster in dense material and is
preferred for cross-country digging
where speed is needed?
1.
Wheel
2.
Ladder
3.
Chain
4.
Blade
Learning Objective:
Recognize
the principles of graders and
grader components.
7-46.
What is the primary purpose of a
grader?
1.
Dig, load, and dump material
with the blade in low
elevations
2.
Cut and move material with
the blade for final shaping
and finishing
3.
Rip and cut extremely hard
material with the blade for
crusher operations
4.
Rip and excavate in-place
aggregates with the blade
and ripper attachment
7-47.
What component of a grader permits
passing through depressions or
ditches one wheel at a time?
1.
Tandem drive
2.
Articulated frame
3.
Oscillating frame
4.
Longitudinal drive
7-48.
Which of the following types of
grader steering helps compensate
for side drift when turning
windrows, keeps tandems on firm
footing when clearing ditches, and
increases stability on side slope
work?
1.
Four-wheel
2.
Front–wheel
3.
Crab
4.
Rear-wheel
1.
True
2.
False
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