To Evaluate a B-spline Curve

Select the Extract Points from Curve tool ( Modeling > Curves > Curve Utilities ).
Select the curve.
If Location(s) Input By is set to Enter Data Point, this data point also determines the location on the curve at which to evaluate.
Enter a data point on the curve.
The curve is evaluated, and the desired attributes are computed and output.

Evaluating a B-Spline Curve. Location Input By = Enter Data Point, Compute Attributes: Tangents = On, Curvature Plot = On