*Question G7A10:
Which symbol in figure G7-1 represents a Zener diode?*  

*Correct Answer is  D: Symbol 5*  

### AI Response: (may contain errors)  

In the context of the Extra Class exam, understanding electronic components and their symbols is crucial. 

### Correct Answer: Symbol 5

- **Why Symbol 5 is Correct**: 
  - A Zener diode is represented by a specific symbol that includes a standard diode symbol with two additional lines on one side. This indicates its ability to conduct in the reverse direction when a certain voltage (the Zener voltage) is reached. Symbol 5 matches this description.

### Why the Other Choices are Incorrect:

- **Symbol 1**: 
  - This symbol represents a standard diode, which allows current to flow in one direction only and does not have the reverse breakdown characteristic of a Zener diode.

- **Symbol 4**: 
  - This symbol typically represents a light-emitting diode (LED). LEDs emit light when current flows through them in the forward direction, which is not a characteristic of Zener diodes.

- **Symbol 11**: 
  - This symbol is often used for a general-purpose transistor, which is a different type of component entirely. Transistors are used for amplification and switching, not for voltage regulation like Zener diodes.

### Summary:
- **Zener Diode Symbol**: Look for the diode symbol with the additional lines indicating reverse breakdown capability (Symbol 5).
- **Other Symbols**: Familiarize yourself with standard diode, LED, and transistor symbols to avoid confusion.

Understanding these symbols will help you identify components correctly in circuit diagrams, which is essential for the Extra Class exam.