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What does the half circle on the clock input of a J-K flip-flop mean?

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What does the half circle on the clock input of a J-K flip-flop mean?

(a) Level enabled

(b) Positive edge triggered

(c) negative edge triggered

(d) Level triggered

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The correct option is (d) Level triggered

Easiest explanation: The half circle on the clock input of a J-K flip-flop mean level triggered. Whereas the presence of triangle symbol implies that the flip-flop is edge-triggered.

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