Fire Department Incident Safety Officer Practice Test

What characterizes a simple beam?

1. Supported at three points

2. Supported at two points

3. Supported only at one end

4. Not supported at all

The correct answer is: Supported at two points

A simple beam is defined as a structural element that is supported at two distinct points, which allows it to span between them and carry loads applied to its length. This configuration enables the beam to bend under load while transferring forces to the supports. Support at two points provides the necessary stability to resist bending and shear forces. This characteristic is vital in applications like buildings and bridges, where the distribution of weight and structural integrity are crucial for safety. The other options describe different types of beam support or conditions that do not align with the standard definition of a simple beam. If a beam were supported at three points, it would exhibit different behavior and be termed a continuous beam. A beam only supported at one end would be considered a cantilever, which has different load-bearing characteristics. Lastly, a beam that is not supported at all would not function as a structural element, as it would not be able to carry any loads.