Q-27 Q-28 wh an the and Coridar a poralel binary adder below. Assumc XaXKc-010 a

Question

Q-27 Q-28 wh an the and Coridar a poralel binary adder below. Assumc XaXKc-010 and YaYaYiYo-0 cround carry nc, whal is the cutput 825si5oafter he Add line goes to a 1 Answer Time 0 12233-4 Full 12 3 4 time Adder b. out 1 2 3 4 time AND Q-27 Select the correct answer from the table above A(t) f^l) Q-28 Two signals, fA(t) and fB(t), are fed into an AND gate, the output is then fed into a NOR gate. At the same time, the signal fB(t) is fed into the same NOR gate. Assuming the signals are positive high, determine the output of the AND and NOR gates as a function of time (you may neglect in delay time). Which answer in the table is correct? O b

Explanation / Answer

for question 27 when the add line is 1 the output is (S3S2S1S0) is directly the output od full adders sum ,now the bianry number is 0010 and 0011 and the end on carry is 0,so simply doing the binary sum we will get the final answer as 0 0101 ,where the 0 at most significant place denotes the overflow,thus option a is correct.

for question 28) considering the timeinterval 0-1 ,Fb is 0 there Fand is 0(since one of the inputs is 0) and for NOR both the input of it (Fand and fb) is 0 for the interval 0-1 thus Fout is 1 ,thus only option b is matching with it ,hence the answer .

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