Exam-style question
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In a digital circuit, which component is essential for storing state information, thereby making the circuit sequential?.
- A.AND gate
- B.Flip‑flop
- C.OR gate
- D.Multiplexer
Model answer
What a good answer should say
- Flip‑flop
Explanation
Why this works
Define both: a combinational logic circuit uses only logic gates and has no storage elements; a sequential logic circuit includes storage elements such as flip‑flops. Identify key difference: the inclusion of a memory element.
Explain when each applies: combinational circuits are used for immediate logic operations; sequential circuits are used when a past state must be retained, as in counters or registers. Conclude: the flip‑flop is the component that provides the necessary memory, so it is essential for sequential logic.
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