10-16.
What is the approximate true
bearing of the object if the local
declination is 10°w and the local
attraction is 20°E?
1.
S80°W
2.
S100°W
3.
N80°W
4.
N100°E
10-17.
What method should you use to
correct or convert a compass
azimuth reading to a true azimuth
reading when both local attraction
and local declination are
easterly?
1.
Subtract the attraction and
declination from the compass
reading
2.
Add the attraction and
declination to the compass
reading
3.
Add the attraction to the
compass reading, then subtract
the declination from the sum
4.
Add the declination to the
compass reading, then subtract
the attraction from the sum
10-18.
When making a closed traverse
compass-tape survey, for what
reason should you first read and
record the back bearing of a
traverse line from the first setup
point?
1.
To offset local attraction
2.
To get rid of declination
3.
To check the accuracy of your
compass
4.
To verify the last bearing you
will take
IN ANSWERING QUESTION 10-19, REFER TO
FIGURE 13-8 IN YOUR TEXTBOOK.
10-19.
Suppose that in the compass-tape
survey field notes shown, the
bearing AE is different from the
bearing EA.
This difference could
have resulted from which of the
following conditions?
1.
Inaccuracy in reading the back
bearing
2.
Inaccuracy in reading the
forward bearing
3.
The difference in the strength
of the local attractions at A
and E
4.
Each of the above
10-20.
Station A bears N70°E (true) from
station B and station C bears
S10°W (true) from station B.
What
size of angle should be entered in
the “computed interior angle”
column of a compass-tape survey
notebook page alongside the
forward bearing of station C?
1.
60°
2.
80°
3.
120°
4.
240°
10-21.
What is the sum of the interior
angles in a closed traverse
consisting of six traverse lines?
1.
360°
2.
540°
3.
720°
4.
1,080°
10-22.
If a compass is in error when you
are taking bearings at several
different places and each error
varies from the preceding one, the
errors are probably due to which
of the following factors?
1.
A shifted movable circle
2.
A bent frame
3.
A bent pivot
4.
A bent needle
10-23.
The only compass available for
taking bearings has an instrument
error.
What forward bearing
should you use when the compass
needle indicates a forward bearing
of N22°W and a back bearing of
S24°E?
1.
S2°E
2.
S46°W
3.
N46°E
4.
N23°W
10-24.
You are using a compass that has
an instrument error and is
graduated for azimuths.
What
forward azimuth should you record
when the compass needle indicates
a forward azimuth of 37° and a
back azimuth of 219°?
1.
37°
2.
38°
3.
91°
4.
128°
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