FRA Tier 2 Qualification Practice Test

To determine the degrees of curvature using the provided chord length and alignment measurement, it's essential to understand the relationship between these measurements in circular curves.

A 31-foot chord corresponds to a 31-foot straight line connecting two points on a circular arc. The alignment measurement of 1 inch indicates the vertical offset of that chord from the arc of the circle.

In road and railway design, curvature is often expressed in degrees per 100 feet of arc length. A degree of curvature is defined as the angle subtended at the center of a circle by a 100-foot chord. For a 31-foot chord, we can derive the curvature as follows:

1. A 1-inch offset at 31 feet relates to curvature through standard geometric principles, where the curvature can be computed by understanding the simple relationships defined by the chord length, the arc length, and the radius of the curve.

2. A 1-inch offset in this scenario at a chord length of 31 feet (or 372 inches) is translated into degrees of curvature, recognizing that a larger offset corresponds to a sharper curve (more degrees).

3. The convention is that for every 1 inch of offset per 100 feet of arced length, you have 0