AExE01 · Chapter 1Programming & Applications🏛️ Past Licensure QuestionID: 6f2071c0
In an electronic power amplifier, a Class B amplifier operates such that the active device conducts for:
In an electronic power amplifier, a Class B amplifier operates such that the active device conducts for:
Multiple Choice Options
- A
The full 360 degrees of the input AC cycle (active region continuously)
- B✓ Correct Option
Exactly 180 degrees (one half-cycle in active region, one half-cycle in cut-off)
- C
Less than 180 degrees of the input AC cycle
- D
Between 180 degrees and 360 degrees of the input AC cycle
Detailed Technical Solution & Explanation
A Class B amplifier is biased at the cut-off point (). Therefore, the output transistor conducts for exactly 180 degrees (one half-cycle) of the input sinusoidal cycle, remaining in cut-off for the other half-cycle.
Option Analysis:
•
Option A (The full 360 degrees of the input AC ...): Defines a Class A amplifier.
•
Option B (Exactly 180 degrees (one half-cycle i...): Correct. Standard definition of Class B amplification.
•
Option C (Less than 180 degrees of the input AC...): Defines a Class C amplifier.
•
Option D (Between 180 degrees and 360 degrees o...): Defines a Class AB amplifier.
Reference: Demo · Set 4NEC Licensure Syllabus