*Question G7B04:
In a Class A amplifier, what percentage of the time does the amplifying device conduct?*  

*Correct Answer is  A: 100%*  

### AI Response: (may contain errors)  

In a Class A amplifier, the amplifying device conducts for the entire input signal cycle, which is why the correct answer is 100%.

### Explanation of the Correct Answer:
- **Class A Operation**: In a Class A amplifier, the output device (like a transistor) is biased so that it conducts for the full 360 degrees of the input signal cycle. This means it is always "on" and amplifying the signal, regardless of the input level.
- **Conduction Time**: Since the device is conducting all the time, the percentage of time it conducts is 100%.

### Why the Other Choices are Incorrect:
- **Choice A (100%)**: This is correct, as explained above.
- **Choice B (More than 50% but less than 100%)**: This is incorrect because Class A amplifiers conduct for the full cycle, not just a portion of it.
- **Choice C (50%)**: This is incorrect because 50% conduction would imply that the amplifier is only active for half of the input signal cycle, which is not the case for Class A amplifiers.
- **Choice D (Less than 50%)**: This is also incorrect for the same reason; Class A amplifiers do not turn off during any part of the cycle.

### Summary:
- Class A amplifiers conduct 100% of the time, making them linear and capable of high fidelity but less efficient compared to other classes (like Class B or Class AB). 

Understanding the operation of Class A amplifiers is crucial for grasping their characteristics and applications in audio and RF amplification.