*Question G7A11:
Which symbol in figure G7-1 represents an NPN junction transistor?*  

*Correct Answer is  B: Symbol 2*  

### AI Response: (may contain errors)  

In figure G7-1, you are asked to identify the symbol for an NPN junction transistor. Let's break down the symbols:

1. **Correct Answer: Symbol 2**  
   - The symbol for an NPN transistor consists of three parts: the emitter, base, and collector. The key feature of the NPN symbol is the arrow on the emitter pointing outward, indicating the direction of conventional current flow (from positive to negative) when the transistor is in the active region. This outward arrow is a mnemonic for "Not Pointing iN" (NPN).

2. **Why the Other Choices are Incorrect:**
   - **Symbol 1**: This is typically the symbol for a PNP transistor, where the arrow on the emitter points inward, indicating the opposite current flow direction compared to an NPN transistor.
   - **Symbol 7**: This symbol does not represent a transistor. It could be a different component, such as a diode or another type of electronic component.
   - **Symbol 11**: This is also not a transistor symbol. It might represent another component like a resistor or capacitor.

3. **Useful Rules of Thumb:**
   - **NPN Transistor**: Arrow Not Pointing iN (NPN) — arrow points out.
   - **PNP Transistor**: Arrow Points iN (PNP) — arrow points in.

Understanding these symbols is crucial for identifying components in circuit diagrams and for troubleshooting or designing circuits.