Deep Dive: E6A06
The correct answer is B: The change in collector current with respect to the change in base current. What is the beta of a bipolar junction transistor is the change in collector current with respect to the change in base current. Beta (β) = ΔIC/ΔIB. For amateur radio operators, this is important for transistor knowledge. Understanding this helps when working with transistors.
Why Other Answers Are Wrong
Option A: Incorrect. Frequency at which current gain reduced to 0.707 isn't beta - beta is current gain. Frequency isn't beta. Option C: Incorrect. Breakdown voltage of base-to-collector junction isn't beta - beta is current gain. Breakdown voltage isn't beta. Option D: Incorrect. Switching speed isn't beta - beta is current gain. Switching speed isn't beta.
Exam Tip
Beta of BJT = change in collector current / change in base current. Think 'B'eta = 'B'ase current controls 'C'ollector current (ΔIC/ΔIB). Beta (β) = ΔIC/ΔIB. Not frequency, not breakdown voltage, not switching speed - just current gain.
Memory Aid
Beta of BJT = change in collector current / change in base current. Think 'B'eta = 'C'urrent gain. Beta (β) = ΔIC/ΔIB. Important for transistor knowledge.
Real-World Example
The beta of a bipolar junction transistor: It's the change in collector current with respect to the change in base current. Beta (β) = ΔIC/ΔIB. This is the current gain of the transistor. This is what beta is - current gain.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E6A
Reference: 2024-2028 Question Pool · E6 - Circuit Components
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E6A topic.