What is the beta of a bipolar junction transistor?
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.
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 Application
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.
Key Concepts
Why Other Options 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.
题目解析
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.
考试技巧
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.
记忆口诀
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.
实际应用示例
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.
错误选项分析
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.
知识点
Beta, Bipolar junction transistor, Change in collector current, Change in base current
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.