Deep Dive: E7B06
The correct answer is B: Low input impedance. What is a characteristic of a grounded-grid amplifier is low input impedance. Grounded-grid amplifiers have low input impedance. For amateur radio operators, this is important for amplifier knowledge. Understanding this helps when working with amplifiers.
Why Other Answers Are Wrong
Option A (High power gain): Incorrect. High power gain isn't the characteristic - grounded-grid has low input impedance. High power gain isn't the characteristic. Option C (High electrostatic damage protection): Incorrect. High ESD protection isn't the characteristic - grounded-grid has low input impedance. ESD protection isn't the characteristic. Option D (Low bandwidth): Incorrect. Low bandwidth isn't the characteristic - grounded-grid has low input impedance. Low bandwidth isn't the characteristic.
Exam Tip
Grounded-grid amplifier characteristic = low input impedance. Think 'G'rounded-'G'rid = 'L'ow 'I'nput impedance. Grounded-grid amplifiers have low input impedance. Not high power gain, not ESD protection, not low bandwidth - just low input impedance.
Memory Aid
Grounded-grid amplifier characteristic = low input impedance. Think 'G'rounded-'G'rid = 'L'ow input. Grounded-grid amplifiers have low input impedance. Important for amplifier knowledge.
Real-World Example
A grounded-grid amplifier: A characteristic is low input impedance. The grid is grounded, which results in low input impedance. This is the characteristic - low input impedance.
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.