Deep Dive: E7B01
The correct answer is A: More than 180 degrees but less than 360 degrees. For what portion of the signal cycle does each active element in a push-pull, Class AB amplifier conduct is more than 180 degrees but less than 360 degrees. Class AB conducts more than 180° but less than 360°. For amateur radio operators, this is important for amplifier knowledge. Understanding this helps when working with amplifiers.
Why Other Answers Are Wrong
Option B: Incorrect. Exactly 180 degrees isn't Class AB - Class AB conducts more than 180° but less than 360°. Exactly 180° is Class B. Option C: Incorrect. Entire cycle isn't Class AB - Class AB conducts more than 180° but less than 360°. Entire cycle is Class A. Option D: Incorrect. Less than 180 degrees isn't Class AB - Class AB conducts more than 180° but less than 360°. Less than 180° is Class C.
Exam Tip
Class AB push-pull conduction = more than 180° but less than 360°. Think 'C'lass 'A'B = 'A'Bove 180° 'B'elow 360°. Class AB conducts more than 180° but less than 360°. Not exactly 180° (Class B), not entire cycle (Class A), not less than 180° (Class C) - just more than 180° but less than 360°.
Memory Aid
Class AB push-pull conduction = more than 180° but less than 360°. Think 'C'lass 'A'B = 'A'Bove 180° 'B'elow 360°. Class AB conducts more than 180° but less than 360°. Important for amplifier knowledge.
Real-World Example
Each active element in a push-pull, Class AB amplifier: It conducts for more than 180 degrees but less than 360 degrees of the signal cycle. This provides a compromise between Class A and Class B. This is the portion - more than 180° but less than 360°.
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.