855.
A blade on a straightblade dozer
must have what type of accessory
before it can be used as a push
dozer?
1.
A cutting edge
2.
A hard facing
3.
A reinforced block
4.
A rubber bumper
8-56.
An operator of a dozer should
always wear a seat belt when
dozing.
1.
True
2.
False
Learning Objective:
Recognize
the principles and components
of rollers.
8-57.
What term is used to describe the
process of compressing loose soil
into a solid mass?
1.
Crushing
2.
Compaction
3.
Pulverizing
4.
Condensing
8-58.
In roller operations, what does
the acronym vpm mean?
1.
Vibration per mile
2.
Vibration pounding minutes
3.
Vibrations per minute
4.
Vibrations pulsate moment
8-59.
Vibratory rollers achieve
compaction through which
of the following factors?
1.
Weight
2.
Impact forces
3.
Vibration response
4.
All of the above
8-60.
The impact forces placed on
the soil during compaction are
generated by what action of the
roller?
1.
The weight of the roller
2.
The vibration of the drum
3.
The kneading effort of the
tires
4.
The speed of the roller
8-61.
A sheepsfoot drum is used for
compacting heavy lifts of what
thickness range?
1.
3 to 4 inches
2.
6 to 12 inches
3.
12 to 24 inches
4.
24 to 36 inches
862.
A smooth drum roller is capable of
compacting lifts of what thickness
range?
1.
4 to 8 inches
2.
8 to 16 inches
3.
16 to 32 inches
4.
32 to 64 inches
8-63.
What type of compaction effort
is generated by a pneumatic-tired
roller?
1.
Vibration
2.
Pounding
3.
Kneading effect
4.
Shaking
8-64.
The air pressure in the tires of
a pneumatic-tired roller should
be set at what psi to compact a
granular subbase?
1.
40 psi
2.
60 psi
3.
80 psi
4.
100 psi
8-65.
What type of roller may fail to
compact areas narrower than the
roll and does NOT compact deeply in
proportion to the roller weight?
1.
Sheepsfoot
2.
Steel wheel
3.
Pneumatic tired
4.
Smooth drum
61