Question

For realisation of JK flip-flop from SR flip-flop, if J=1, K=0 & present state is 0(i.e. Q(n)=0) then excitation input will be ___________

(a) S=0, R=1

(b) S=X, R=0

(c) S=1, R=0

(d) S=1, R=1

The question was posed to me in an international level competition.

This key question is from Realisation of one Flip-flop using other Flip-flops in portion Flip-Flops of Digital Circuits

Answer 1

The correct choice is (c) S=1, R=0

To explain: If J=1, K=0 & present state is 0(i.e. Q(n)=0) then next state will be 1 which results excitation inputs as S=1 & R=0.