Q.

When both inputs of a J-K flip-flop cycle, the output will                        

A. be invalid
B. change
C. not change
D. toggle
Answer» C. not change
Explanation: after one cycle the value of each input comes to the same value. eg: assume j=0 and k=1. after 1 cycle, it becomes as j=0->1->0(1 cycle complete) and k=1->0->1(1 cycle complete). the j & k flip-flop has 4 stable states: latch, reset, set and toggle.
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