When two asynchronous active low inputs PRESET and CLEAR are applied to a J-K flip flop the output will be

When two asynchronous active low inputs PRESET and CLEAR are applied to a J-K flip flop the output will be Correct Answer Undefined

The PRESET and CLEAR inputs of the JK Flip-Flop are asynchronous, which means that they will have an immediate effect on the Q and Q’ outputs regardless of the state of the clock and / or the J and K inputs.[ alt="F1 Neha.B 30-03-21 Savita D1" src="//storage.googleapis.com/tb-img/production/21/03/F1_Neha.B_30-03-21_Savita_D1.png" style="width: 250px; height: 124px;">

1.When the preset input is activated, the flip-flop will be set (Q=1, not-Q=0) regardless of any of the synchronous inputs or the clock.

 2.When the clear input is activated, the flip-flop will be reset (Q=0, not-Q=1), regardless of any of the synchronous inputs or the clock.

3.When preset and clear inputs are activated we get an invalid state on the output, where Q and not-Q go to the same state.

Important Points-

JK Flip-Flop Truth Table- From  truth table it can be seen that the CLEAR (CLR) and PRESET inputs are active at a low logic level  and put on the Q output of the Flip-Flop, a high logic level regardless of the state of the clock and / or the state of the J and K inputs.