What is the shape of a C-10315 in an HF block diagram?

• A. Circle
• B. Triangle
• C. Rectangle
• D. Square

Answer: (D)

In HF block diagrams, the shape of a symbol helps you quickly identify what kind of component you’re looking at. The C-10315 designation uses a square shape, which is the standard way this particular symbol is drawn in those diagrams. That square signals a specific module or unit of equipment, distinct from other shapes that denote different kinds of elements.

So when you see the C-10315 symbol, interpret it as that particular module represented by a square. Circles are typically used for points like connectors or reference nodes, triangles for directional or special-purpose blocks, and rectangles tend to be a more generic block without the specific connotation of the C-10315 symbol.