GATE | GATE CS 2010 | Question 65

In the sequential circuit shown below,if the initial value of the output Q1Q0 is 00,what are the next four values of Q1Q0?

CSE_201032
(A) 11, 10, 01, 00
(B) 10, 11, 01, 00
(C) 10, 00, 01, 11
(D) 11, 10, 00, 01


Answer: (A)

Explanation: We have t flip flop

Truth table of t flip flop



 

t q
0 q
1 q’

So q0 always inverted as t=1 always

So 1)q10=1

2)q0 =0

3)q0 =1

4)q0 =1

For q1 also t=1 always but clock is so we have to observe positive edge of clock I.e. when is q0 going from 0 -> 1

1)q1 =1

2)q1 =1

3)q1 =0

4)q1 =0

So final combination q0q1->(11,10,01,00) Ans (A)

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