10-63.
On the blower type of drill,
cuttings are removed in what
manner?
1.
By blowing water from the
bottom of the hole
2.
By a steady supply of air
passing through the drill
steel
3.
By stopping the drill and
blowing the cuttings out
through the drill steel
4.
By stopping the drill and
blowing the hole for 30
seconds after every 2 feet
or 1 minute of drilling
operations
10-64.
Drill manufacturers recommend
installing the in-line oiler
within how many feet from the
drill?
1.
10 to 12 feet
2.
15 to 20 feet
3.
20 to 25 feet
4.
25 to 30 feet
10-65.
Which of the following pneumatic
tools is built for heavy-duty use
on timber construction work and
may be used for ripping as well
as cross cutting?
1.
Chain saw
2.
Nail driver
3.
Drill
4.
Circular saw
Learning Objective:
Recognize the
principles of the crawler-mounted
rock drill.
10-66.
The crawler-mounted rock drill is
a self-propelled unit designed
primarily to perform which of the
following operations?
1.
Drill water wells
2.
Drill auger holes
3.
Drill vertical holes only
4.
Drill vertical and angular
blast holes in rock
10–67.
The compressor discharge air
volume of the rock drill is
what maximum cfm?
1.
230
2.
200
3.
130
4.
100
10–68.
The feed motor is capable of
exerting a maximum pull up of
how many pounds?
1.
2,410 pounds
2.
3,410 pounds
3.
4,410 pounds
4.
5,410 pounds
10-69.
Which of the following control
levers is used when drilling
boreholes and coupling and
uncoupling drill steel?
1.
The fast feed
2.
The drill
3.
The rotation
4.
The slow speed
10-70.
What is the function of the
vaposol system?
1.
To throw a mist down the
blow hole to control dust
2.
To throw a mist through the
drill steel to control cooling
3.
To throw a mist around the
drill area to control dust
4.
To throw a mist down the
borehole to achieve the
optimum moisture content
required for compaction of
a blast hole
10–71.
Before drilling, the blow air
pressure gauge should indicate
what minimum psi?
1.
50
2.
100
3.
150
4.
200
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