*Question G7B01:
What is the purpose of neutralizing an amplifier?*  

*Correct Answer is  B: To eliminate self-oscillations*  

### AI Response: (may contain errors)  

Neutralizing an amplifier is a technique used to prevent unwanted oscillations that can occur due to feedback within the amplifier circuit. Here's why the correct answer is B, and why the other choices are incorrect:

1. **Correct Answer: B - To eliminate self-oscillations**
   - **Explanation**: In amplifiers, especially those using vacuum tubes or transistors, feedback from the output to the input can cause the amplifier to oscillate on its own, even without an input signal. This is known as self-oscillation. Neutralization involves adding a compensating feedback path that cancels out the unwanted feedback, thus stabilizing the amplifier and preventing these oscillations.

2. **Why the other choices are incorrect:**
   - **A: To limit the modulation index**
     - **Explanation**: The modulation index is related to the depth or extent of modulation in a signal, particularly in AM or FM transmissions. Neutralization does not affect modulation; it is concerned with stabilizing the amplifier.
   - **C: To cut off the final amplifier during standby periods**
     - **Explanation**: Cutting off the amplifier during standby is typically achieved through other means, such as biasing or using a standby switch. Neutralization is not related to turning the amplifier on or off.
   - **D: To keep the carrier on frequency**
     - **Explanation**: Frequency stability is usually managed by the oscillator or frequency control circuits, not by neutralization. Neutralization is specifically for preventing self-oscillations, not for frequency control.

In summary, neutralization is a technique used to ensure that an amplifier does not generate unwanted oscillations, which can interfere with its proper operation.