Surveying - Engineering
Q1: An ideal transition curve isA
cubic parabola
B
cubic spiral
C
clothoid spiral
D
true spiral.
ANS:C - clothoid spiral IRC recommends Spiral or clothoid as the ideal transition curve due to following reasons: 1. It satisfies that rate of change of centrifugal acceleration is constant i.e., Ls.R = constant. Where Ls = length of transition curve R = radius of curve. 2. The calculation and field implementation of spiral curve is simple and easy. 3. It enhances aesthetics also. |
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