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Construction Surveying - Curves


Quiz Questions

1.The surveyor can establish curves of short radius, usually less than one tape length, by holding one end of the tape at the center of the circle and swinging the tape in an arc, marking as many points as desired.
True
False
2. ___________and _________curves are treated as a combination of two or more simple curves.
Reverse and spiral
Compound and reverse
Spiral and compound
3.A ____________ curve consists of two simple curves joined together but curving in opposite directions.
Reverse
Spiral
Compound
4.The surveyor computes the value of ___________ either from the preliminary traverse station angles or measures it in the field.
Radius
Intersecting angle
Point of curvature
5.The _________________________ is the point where the circular curve begins.
Point of curvature
Point of tangency
6.Road Curves to the right implies__________________.
Occupying the PT and sight the PI with 360 degrees minus one half of the I angle on the horizontal circle
Occupying the PT, and sight the PI with one half of the I angle on the horizontal circle
7.Figure3-5 represents ________________________.
Sub chord corrections
Deflection angles
8.The inaccessible distance AV is computed as ________________________.
AV= AB sinb / sin K
AV= AB sinb / cos K
9.Figure 3-9 represents _________________.
Obstacle on a curve
Reverse curve
10.The degree of the curve using the chord method is ____________.
Cos D = 2 (50 feet/R)
Sin D = 2 (50 feet/R)
11.Figure 3-11 represents ___________________.
Reverse curves
Compound curves
12.In figure 3-15, what does SC represent?
The point of change from spiral to reverse curve
The point of change from spiral to circular curve
13.In figure 3-15, what does CS represent?
Point of change from spiral curve to circular
Point of change from circular curve to spiral
14.In figure 3-15, what does ST represent?
Point of change from tangent to spiral
Point of change from spiral to tangent
15.The minimum spiral length applied to a rail road is determined from the equation ___________________.
Ls = 1.6V3/R,
Ls = 1.17 EV
16.A vertical curve connecting a descending grade with an ascending grade, or with one descending less sharply, is called _________________.
Sag
Invert curve
Either of the two
Neither of the two
17.When the rate of change (r) is not given then __________________ formulae is used to compute L for a summit Curve.
L=100ft [(G2-G1)/4]
L=125ft [(G2-G1)/4]
18.Rougher the terrain ________________ is the station interval.
Smaller
Larger
19.The surveyor may find the elevation of the stations along the back tangent as follows:
Elev of sta = Elev of PVI + (distance from the PVI x G2)
Elev of sta = Elev of PVC + (distance from the PVC x G1)
20.The value of the __________________ is the distance between the tangent line and the road grade.
Vertical offset
Horizontal offset
21.The formula x= G ( L/(G2-G1)) is derived for _____________________.
Horizontal distance
Vertical distance
22.Figure 3-20 represents _____________________.
Typical solution of a summit curve
Typical solution of a sag curve
23.Figure 3-13 represents ________________________.
Reverse curve connecting perpendicular tangents
Reverse curve connecting parallel tangents
24.Figure 3-12 represents_____________________.
Simple curve between successive PIs
Reverse curve between successive PIs
25.To solve a simple curve, the surveyor must know three elements. They are the PI station value, I angle and the degree of curve which will be given in the project specifications.
True
False