Fundamentals of Surveying (FS) Practice Exam

The deflection angle for a full station for a 1° curve is _____.

1. 1°

2. 0°15'

3. 0°30'

4. 2°

The correct answer is: 0°30'

In surveying and civil engineering, a deflection angle is the angle between the tangents at the beginning and end of a circular curve, which is critical for understanding how a vehicle or object will navigate the curve. For a simple circular curve, the deflection angle can be calculated based on the radius of the curve and the degree of the curve. When dealing with a 1° curve, which means the circular curve subtends an angle of 1° at the center, the corresponding deflection angle for a full station (an instrument setup point) is typically calculated as twice the degree of the curve. This means, for a 1° curve, the deflection angle would be 2°. Thus, the deflection angle for a full station at a 1° curve is 2°, which is significant for ensuring accurate alignment and measuring when surveying areas needing precise angles for roads, pathways, or other structures. Understanding this relationship is crucial for professionals engaged in design and construction, as it impacts the overall geometry of the project.