10-66.
The middle vertical offset on a
symmetrical vertical curve is 2 ft
and L = 400 ft. What is the value
of the vertical offset at the
first station ahead of the PVC?
1.
2.0 ft
2.
1.5 ft
3.
1.0 ft
4.
0.5 ft
IN ANSWERING QUESTIONS 10-67 AND 10-68,
USE THE FOLLOWING INFORMATION.
PVC IS AT STA. 39 + 00 ELEV = 100.00 FT
L = 1000 FT g1= +10% g2 = -2%
10-67.
The turning point for this curve
will be located at what station?
1.
47 + 57.8
2.
44 + 24.5
3.
40 + 91.2
4.
40 + 24.5
10-68.
The elevation of the turning point
is
1.
101.23 ft
2.
101.67 ft
3.
103.33 ft
4.
105.00 ft
10-69.
When computing the elevations of
symmetrical vertical curves, you
can check the accuracy of your
computation through a derived
constant value for the
1.
second differences in
elevations of successive
stations
2.
vertical offsets of
successive stations
3.
second differences in
elevations of adjacent
stations
4.
e value at successive stations
IN ANSWERING QUESTIONS 10-70 and 10-71,
YOU ARE LAYING OUT A 1,500-FOOT VERTICAL
CURVE. THE ELEVATION AT THE PVC IS 326.21
FT. THE PVC IS LOCATED AT STATION
29 + 00.
10-70.
The middle vertical offset is
1.
6 ft
2.
10 ft
3.
16 ft
4.
20 ft
10-71.
The turning point is at station
1.
29 + 31.3
2.
34 + 31.3
3.
38 + 31.3
4.
44 + 31.3
10-72.
Vertical curve computation should
be checked by plotting the curve
on an exaggerated scale in which
the vertical scale is larger than
the
1.
vertical offset
2.
horizontal scale
3.
ship’s curve
4.
stationing
10-73.
The original tracing of a road
profile will contain which of
the following information?
1.
Tangent elevations
2.
The vertical offsets
3.
Length of the curve
4.
x/1 ratio
10-74.
The procedure used to set grade
stakes for a POVC differs greatly
from the procedure used to set
grade stakes for a point on a
grade tangent.
1.
True
2.
False
g1= -8% g2 = +4% 1l = 500 ft
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