*Question E7C03:
What is the purpose of adding an inductor to a Pi-network to create a Pi-L-network?*  

*Correct Answer is  A: Greater harmonic suppression*  

### AI Response: (may contain errors)  

The correct answer to the question about the purpose of adding an inductor to a Pi-network to create a Pi-L-network is:

**Correct Answer: A: Greater harmonic suppression**

### Explanation:

1. **Why the correct answer is correct:**
   - Adding an inductor to a Pi-network forms a Pi-L-network, which enhances the network's ability to suppress harmonics. The inductor provides additional reactance that helps filter out unwanted harmonic frequencies, allowing for a cleaner output signal. This is particularly important in RF applications where harmonic distortion can interfere with other communications.

2. **Why the other choices are incorrect:**
   - **B: Higher efficiency**: While a Pi-L-network can improve performance, it does not inherently increase efficiency. Efficiency is more related to the design and quality of components rather than the addition of an inductor.
   - **C: To eliminate one capacitor**: The addition of an inductor does not eliminate the need for capacitors in the network. Instead, it complements the existing components to improve performance.
   - **D: Greater transformation range**: The transformation range is influenced by the overall design and component values of the network. While a Pi-L-network can provide some flexibility, the primary purpose of adding the inductor is harmonic suppression, not necessarily to increase the transformation range.

### Useful Concepts:
- **Pi-network**: A configuration of two capacitors and one inductor (or vice versa) used for impedance matching and filtering.
- **Pi-L-network**: A variation of the Pi-network that includes an inductor, enhancing harmonic suppression.
- **Harmonic suppression**: The reduction of unwanted harmonic frequencies in a signal, which is crucial for maintaining signal integrity in RF applications.

In summary, the addition of an inductor to create a Pi-L-network primarily serves to improve harmonic suppression, making it the correct answer to the question.