7-18.
If station A and points B and C are
in a straight line with station A
between points B and C, what is the
distance between points B and C?
1.
640.5 ft
2.
641.5 ft
3.
1,095.0 ft
4.
1,096.0 ft
7-19.
What is the difference in elevation
between points B and C?
1.
56.7 ft
2.
46.3 ft
3.
30.6 ft
4.
16.5 ft
7-20.
Stadia tables use a constant stadia
distance of
1.
50 ft
2.
100 ft
3.
101 ft
4.
200 ft
7-21.
Unequal refraction caused by the
sun’s rays will have what effect on
your data?
1.
Cause longer distances than
actual to be read
2.
Cause shorter distances than
actual to be read
3.
Cause reversed vertical angles
to be read
4.
Cuuse smaller vertical angles
than actual to be read
7-22.
How do you compensate for
refraction?
1.
By ignoring the instrument
constant
2.
By taking all readings at two
different times of the day
3.
By shading the instrument
4.
By using the refraction
compensation formula
7-23.
The stadia circle provides
conversion factors that are used
with the stadia interval to
determine vertical and horizontal
distances.
1.
True
2.
False
7-24.
How is the arc reading of a
multiplier scale used in
computations?
1.
Multiplied by the rod intercept
to obtain the stadia distance
2.
Subtracted from the stadia
distance
3.
Added to the rod intercept and
then multiplied by the stadia
constant
4.
Multiplied by the stadia
interval to obtain the
horizontal distance
7-25.
The subtraction scale gives a
percentage reading that is used to
reduce your stadia distances to
obtain the actual distances.
1.
True
2.
False
7-26.
You are using a transit with a
multiplier stadia arc. You have a
93 reading on the horizontal stadia
arc with a depressed vertical
angle. The rod intercept is 5.63.
What is the horizontal distance?
1.
506.7 ft
2.
523.6 ft
3.
563.0 ft
4.
602.4 ft
7-27.
The elevation of station A is
325.5 ft and the HI is 329.7 ft.
You are sighted on point B. You
have a -7 reading on the vertical
stadia arc, a rod reading of 4.2,
and a rod intercept of 5.1. What
is the elevation of point B?
1.
289.8 ft
2.
318.8 ft
3.
361.2 ft
4.
372.9 ft
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