Discussion
The race around condition in JK flipflop occurs when,
Answer: B
Race around occurs when J = 1, K = 1.
With J = K = 1 a JK flip-flop toggles. In a level-triggered flip-flop, if the clock stays high longer than the propagation delay, the output keeps toggling again and again while the clock is high, so its final state is uncertain. This is the race around condition.
J = 0, K = 0 holds the state, J = 1, K = 0 sets it and J = 0, K = 1 resets it; none of these makes the output change more than once, so none causes racing. The cure is a master-slave or edge-triggered flip-flop.
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