Deep Dive: E7D01
The correct answer is D: The conduction of a control element is varied to maintain a constant output voltage. How does a linear electronic voltage regulator work is that the conduction of a control element is varied to maintain a constant output voltage. Linear regulators vary conduction to maintain constant output. For amateur radio operators, this is important for power supply design. Understanding this helps when working with regulators.
Why Other Answers Are Wrong
Option A: Incorrect. Having ramp voltage as output isn't how linear regulator works - linear regulator varies conduction to maintain constant output. Ramp voltage isn't how it works. Option B: Incorrect. Eliminating need for pass transistor isn't how linear regulator works - linear regulator uses pass transistor. Eliminating pass transistor isn't how it works. Option C: Incorrect. Control element duty cycle proportional to conditions isn't linear regulator - that's switching regulator. Duty cycle isn't linear regulator.
Exam Tip
Linear voltage regulator works = conduction of control element varied to maintain constant output voltage. Think 'L'inear 'R'egulator = 'L'inear 'R'esistance variation (varies conduction). Linear regulators vary conduction to maintain constant output. Not ramp voltage, not eliminating pass transistor, not duty cycle (switching) - just varies conduction.
Memory Aid
Linear voltage regulator works = conduction of control element varied to maintain constant output voltage. Think 'L'inear 'R'egulator = 'V'aries 'C'onduction. Linear regulators vary conduction to maintain constant output. Important for power supply design.
Real-World Example
A linear electronic voltage regulator: It works by varying the conduction of a control element to maintain a constant output voltage. As load or input changes, the regulator adjusts the pass element's conduction. This is how it works - varies conduction to maintain constant output.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E7D
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 E7D topic.