Which statement best describes a parallel chord truss?

• A. A curved-chord truss
• B. A diagonals arranged in a single plane
• C. A top and bottom chords not parallel
• D. A truss with chords running in the same plane

Answer: (D)

A parallel chord truss is defined by having its top and bottom chords parallel to each other while lying in the same plane. This setup creates a stable, planar framework where the diagonals connect the two parallel chords, forming predictable triangular units that efficiently carry loads.

Among the options, describing the structure as a truss with chords running in the same plane best captures the essential geometry: the chords are in the same plane and arranged in parallel alignment, which is the key characteristic of this type of truss. The curved-chord description is not fitting because the chords are straight in this design. Saying the diagonals are arranged in a single plane describes a planar truss in general but doesn’t specify the parallel relationship of the chords. Saying the top and bottom chords are not parallel conflicts with the defining feature.