Deep Dive: E7B08
The correct answer is B: The switching device is at saturation or cutoff most of the time. Why are switching amplifiers more efficient than linear amplifiers is that the switching device is at saturation or cutoff most of the time. Switching devices dissipate less power when fully on or off. For amateur radio operators, this is important for amplifier knowledge. Understanding this helps when selecting amplifiers.
Why Other Answers Are Wrong
Option A: Incorrect. Operating at higher voltages isn't the reason - switching device being at saturation/cutoff is the reason. Higher voltages isn't the reason. Option C: Incorrect. Linear amplifiers having high gain isn't the reason - switching device being at saturation/cutoff is the reason. High gain isn't the reason. Option D: Incorrect. Switching amplifiers using push-pull circuits isn't the reason - switching device being at saturation/cutoff is the reason. Push-pull isn't the reason.
Exam Tip
Switching amplifiers more efficient = switching device at saturation or cutoff most of the time. Think 'S'witching 'A'mplifier = 'S'aturation/'C'utoff (low power dissipation). Switching devices dissipate less power when fully on or off. Not higher voltages, not high gain, not push-pull - just saturation/cutoff most of the time.
Memory Aid
Switching amplifiers more efficient = switching device at saturation or cutoff most of the time. Think 'S'witching = 'S'aturation/'C'utoff. Switching devices dissipate less power when fully on or off. Important for amplifier knowledge.
Real-World Example
Switching amplifiers are more efficient than linear amplifiers: It's because the switching device is at saturation or cutoff most of the time. When fully on or off, the device dissipates minimal power. This is the reason - saturation/cutoff most of the time.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E7B
Reference: 2024-2028 Question Pool · E7 - Practical Circuits
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E7B topic.