UGC NET CSE | June 2016 | Part 2 | Question: 10

Question

In a positive edge triggered $J$-$K$ flip flop , if $J$ and $K$ both are high then the output will be ______on the rising edge of the clock :

• A. No change
• B. Set
• C. Reset
• D. Toggle

Answer 1

Ans 4) Toggle

When J = 1 and K = 1 , The output continuously Toggles from 1 to 0 and 0 to 1. At the end Output is indeterminate. This condition is called as Race around Condition. This happens when Propagation Delay is less than the Pulse width.

 Refer : http://ecetutorials.com/digital-electronics/jk-flip-flop/  for more on J K Flip Flop