Which circuit is bistable?
The correct answer is C: A flip-flop. Which circuit is bistable is a flip-flop. Flip-flops have two stable states (bistable). For amateur radio operators, this is important for digital circuits. Understanding this helps when working with digital logic.
Exam Tip
Bistable circuit = flip-flop. Think 'B'istable = 'B'inary 'S'table (two stable states). Flip-flops have two stable states (bistable). Not AND gate, not OR gate, not bipolar amplifier - just flip-flop.
Memory Aid
"Bistable circuit = flip-flop. Think 'B'istable = 'F'lip-'F'lop. Flip-flops have two stable states (bistable). Important for digital circuits."
Real-World Application
A bistable circuit: It's a flip-flop. Flip-flops have two stable states (0 and 1) and can remain in either state until changed. This is the circuit - flip-flop is bistable.
Key Concepts
Why Other Options Are Wrong
Option A (AND gate): Incorrect. AND gate isn't bistable - flip-flops are bistable. AND gate isn't bistable.
Option B (OR gate): Incorrect. OR gate isn't bistable - flip-flops are bistable. OR gate isn't bistable.
Option D (Bipolar amplifier): Incorrect. Bipolar amplifier isn't bistable - flip-flops are bistable. Bipolar amplifier isn't bistable.
题目解析
The correct answer is C: A flip-flop. Which circuit is bistable is a flip-flop. Flip-flops have two stable states (bistable). For amateur radio operators, this is important for digital circuits. Understanding this helps when working with digital logic.
考试技巧
Bistable circuit = flip-flop. Think 'B'istable = 'B'inary 'S'table (two stable states). Flip-flops have two stable states (bistable). Not AND gate, not OR gate, not bipolar amplifier - just flip-flop.
记忆口诀
Bistable circuit = flip-flop. Think 'B'istable = 'F'lip-'F'lop. Flip-flops have two stable states (bistable). Important for digital circuits.
实际应用示例
A bistable circuit: It's a flip-flop. Flip-flops have two stable states (0 and 1) and can remain in either state until changed. This is the circuit - flip-flop is bistable.
错误选项分析
Option A (AND gate): Incorrect. AND gate isn't bistable - flip-flops are bistable. AND gate isn't bistable. Option B (OR gate): Incorrect. OR gate isn't bistable - flip-flops are bistable. OR gate isn't bistable. Option D (Bipolar amplifier): Incorrect. Bipolar amplifier isn't bistable - flip-flops are bistable. Bipolar amplifier isn't bistable.
知识点
Circuit, Bistable, Flip-flop
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.