*Question G7A12:
Which symbol in Figure G7-1 represents a solid core transformer?*  

*Correct Answer is  C: Symbol 6*  

### AI Response: (may contain errors)  

In Figure G7-1, different symbols represent various electronic components. Understanding these symbols is crucial for identifying components in circuit diagrams.

1. **Correct Answer: Symbol 6**  
   - **Explanation**: Symbol 6 represents a solid core transformer. In schematic diagrams, a transformer is typically depicted with two sets of coils (indicating the primary and secondary windings) and a core. A solid core transformer is shown with a solid line between the coils, indicating a solid core material, such as iron.

2. **Why the Other Choices are Incorrect**:
   - **Symbol 4**: This symbol usually represents a variable capacitor. It is depicted with two parallel lines (plates) and an arrow indicating variability.
   - **Symbol 7**: This symbol typically represents a relay. It is shown with a coil and a switch, indicating the relay's function of opening or closing a circuit.
   - **Symbol 1**: This symbol often represents a resistor. It is depicted as a zigzag line, indicating resistance in a circuit.

3. **Useful Rules of Thumb**:
   - **Transformers**: Look for two sets of coils and a core. The core can be solid (solid line) or air (dashed line).
   - **Capacitors**: Parallel lines represent the plates, and an arrow indicates a variable capacitor.
   - **Resistors**: Zigzag lines are used to represent resistors in schematic diagrams.

By familiarizing yourself with these symbols, you can quickly identify components in circuit diagrams, which is essential for both the exam and practical applications in amateur radio.