Deep Dive: E7A01
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.
Why Other Answers 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.
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 Example
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.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E7A
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 E7A topic.