10-25.
Which of the following defects is
most likely to cause a compass to
read incorrectly at both ends of
its needle?
1.
A bent pivot
2.
A warped compass card
3.
A bent needle
4.
A blunt pivot point
10-26.
A compass needle that is weak
magnetically should be
strengthened by which of the
following methods?
1.
Placing the magnet in an
inductive field
2.
Drawing the needle over a
magnet
3.
Placing the magnet in a
shielded box
4.
Heating the needle with a
lighted match
10-27.
A compass needle acts sluggishly
although it has retained its full
magnetism.
Which of the following
methods should you use to make the
needle act smartly?
1.
Sharpen its points
2.
Sharpen the point on the pivot
3.
Reshape it with a special tool
4.
Demagnetize it
10-28.
In setting up and leveling a
transit, you have followed all of
the correct procedures.
You
discover, however, that the plumb
bob is still not quite directly
over the station point.
Which of
the following actions should you
take next?
1.
Loosen two adjacent leveling
screws to free the shifting
plate and shift the transit
head laterally
2.
Replace the plumb bob
3.
Adjust the tripod legs
4.
Re-level the instrument
10-29.
Before taking up a transit, which
of the following actions should
you take concerning the telescope
and the vertical motion clamp?
1.
Bring the telescope
perpendicular to the vertical
axis and firmly tighten the
clamp
2.
Point the telescope vertically
upward and firmly tighten the
clamp
3.
Point the telescope vertically
upward and loosen the clamp
4.
Point the telescope vertically
upward and lightly tighten the
clamp
10-30.
In which of the following ways are
the horizontal limbs of transits
numbered?
1.
0°-360° clockwise
2.
0°-360° clockwise, also 0°-90°
by quadrants
3.
0°-360° clockwise, also
360°-0° counterclockwise
4.
Each of the above
10-31.
When you are turning a 40°
horizontal angle by transit, what
part will normally point to the
number of degrees turned?
1.
Zero on the A-vernier
2.
Zero on the B-vernier
3.
0°-360° graduation on the
horizontal limb
4.
40°-320° graduation on the
horizontal limb
10-32.
Releasing the upper motion of a
transit enables you to take which
of the following actions?
1.
Hold the telescope in place
2.
Rotate and train the telescope
3.
Hold the horizontal limb in
place
4.
Rotate and align the
horizontal limb
10-33.
Which of the following steps
should you normally take when
turning a 20° horizontal angle
from a reference line with a
transit?
1.
Clamp the lower motion to hold
the telescope in place after
training it on the reference
line
2.
Release the lower motion to
rotate the telescope 20°
3.
Align the 0° -360° graduation
on the horizontal limb with
the zero on the A-vernier
4.
Align the 0° -360° graduation
on the horizontal limb with
the zero on the B-vernier
10-34.
To fix the exact position of the
horizontal limb with respect to
the A-vernier, what transit screw,
if any, should you use?
1.
Telescope clamp screw
2.
Upper motion tangent screw
3.
Lower motion tangent screw
4.
None
69
