# 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