FUNDAMENTAL SURVEYING Horizontal and Vertical Curves 2

Question 1

Using the chord definition, the degree of curve (Dc) is the central angle subtended by a chord of:

Accepted Answer

100 feet

Answer

Both the arc and chord definitions use a 100-foot standard length; the chord definition uses a 100-foot chord rather than a 100-foot arc.

Question 2

A reverse curve is characterized by:

Accepted Answer

Two simple curves joined at a point where they turn in opposite directions

Answer

A reverse curve consists of two simple circular curves that curve in opposite directions, joined at the Point of Reverse Curvature (PRC), forming an S-shape.

Question 3

The long chord (C) of a simple horizontal curve connecting PC to PT is given by:

Accepted Answer

C = 2R × sin(Δ/2)

Answer

The long chord C = 2R × sin(Δ/2), derived from the isosceles triangle formed by the two radii drawn to PC and PT and the chord itself.

Question 4

A spiral (transition) curve inserted between a straight tangent and a circular curve primarily serves to:

Accepted Answer

Provide a gradual change in centrifugal force and allow smooth superelevation runoff

Answer

Spiral curves allow the centrifugal force and superelevation to increase gradually from zero on the tangent to their full values on the circular curve, improving driver comfort and safety.

Question 5

Using the arc definition, what is the radius of a 2-degree curve?

Accepted Answer

2,864.8 feet

Answer

R = 5729.58 / Da = 5729.58 / 2 = 2864.79 ≈ 2,864.8 feet, using the standard arc-definition relationship.

FUNDAMENTAL SURVEYING Practice Test

FUNDAMENTAL SURVEYING Practice Test

FUNDAMENTAL SURVEYING Horizontal and Vertical Curves 2