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

*Correct Answer is  B: Symbol 2*  

### AI Response: (may contain errors)  

To identify the NPN junction transistor in figure G7-1, we need to understand the symbols used for transistors in circuit diagrams.

1. **Correct Answer: Symbol 2**
   - The NPN transistor symbol consists of three terminals: the collector (C), base (B), and emitter (E). 
   - In the NPN symbol, the arrow on the emitter points outwards, indicating the direction of conventional current flow (from the collector to the emitter). This is characteristic of NPN transistors.

2. **Why the Other Choices are Incorrect:**
   - **Symbol 1:** This symbol typically represents a PNP transistor, where the arrow on the emitter points inwards, indicating current flow into the transistor.
   - **Symbol 7:** This symbol does not represent a standard transistor; it may represent a different component or a specific configuration that is not an NPN transistor.
   - **Symbol 11:** Similar to Symbol 7, this does not correspond to an NPN transistor and may represent another type of electronic component.

3. **Useful Rules of Thumb:**
   - Remember that in NPN transistors, the arrow on the emitter points outwards, while in PNP transistors, the arrow points inwards.
   - The three terminals are always labeled as collector (C), base (B), and emitter (E), which can help in identifying the type of transistor.

By understanding these symbols and their characteristics, you can accurately identify NPN and PNP transistors in circuit diagrams.