Question

Which element of JK flip-flop operates in toggle mode when clock pulse is applied?

• A. S
• B. R
• C. J
• D. J and K

Hint:

JK = 1,1 → toggle mode.

Answer 1

The Correct Option is D

Concept: JK flip-flop is an improvement over SR flip-flop.

Step 1: Truth table condition Toggle occurs when: \[ J = 1,\quad K = 1 \]

Step 2: Behavior Output toggles: \[ Q_{next} = \overline{Q} \]

Step 3: Clock pulse effect On each clock pulse, output flips state.

Step 4: Interpretation Both inputs must be active.

Step 5: Conclusion \[ \boxed{J \text{ and } K} \]

Final Answer: \[ \boxed{(D)} \]