Civil Engineering Professional Engineer Practice Exam 2025 - Free PE Practice Questions and Study Guide

A cantilever beam is characterized by its unique support condition where it is anchored or supported at one end while extending freely at the other end. This configuration allows the beam to protrude beyond its support, which is essential for applications like balconies, bridges, and overhangs. The main advantage of a cantilever beam is that it can carry loads applied to its free end without the need for support under the entire span, making it efficient for various structural applications.

In contrast, a beam supported at both ends or with fixed connections at both ends would not exhibit the same cantilever behavior. Furthermore, while a cantilever beam can be horizontal, it is not a defining feature; it can also be angled depending on the design requirements and applications. The crucial aspect that defines a cantilever beam is the single point of support, which allows it to handle bending moments effectively due to the loads applied.