AExE01 · Chapter 1Basic Electrical & Electronics🏛️ Past Licensure QuestionID: c2b7275b
How many transistors are standardly used in a push-pull Class B power amplifier?
How many transistors are standardly used in a push-pull Class B power amplifier?
Multiple Choice Options
- A
1
- B✓ Correct Option
2
- C
3
- D
4
Detailed Technical Solution & Explanation
A standard Class B push-pull power amplifier employs exactly two complementary or matched transistors: one transistor conducts during the positive 180° half-cycle of the AC signal, and the second transistor conducts during the negative 180° half-cycle, combining to reproduce the full 360° output waveform across the load.
Option Analysis:
•
Option A (1): Incorrect. A single transistor biased at Class B would amplify only half the cycle (180°), causing 50% loss.
•
Option B (2): Correct. A Class B push-pull stage requires exactly 2 transistors.
•
Option C (3): Incorrect.
•
Option D (4): Incorrect. Full H-bridge requires 4, but standard Class B uses 2.
Reference: Demo2 · Set 2NEC Licensure Syllabus