Electronics and Communication Engineering - Electronic Devices and Circuits

16.
Two 2's complement number having sign bits X and Y are added and the sign bit of the result is Z. then, the occurrence of overflow is indicated by the Boolean function.
XYZ
X Y Z
X YZ + XY Z
XY + YZ + ZX
Answer: Option
Explanation:

carry of a one bit full order is given by expression XY + YZ + ZX.


17.
If A = 0101, then A' is
1010
1011
1001
0110
Answer: Option
Explanation:

A' = 1010 + 1 = 1011.


18.
11011 in gray code = __________ .
100102
111112
111002
100012
Answer: Option
Explanation:

Change to decimal and then to binary.


19.
In the circuit of the given figure, Y =
0
1
X
X
Answer: Option
Explanation:

XX = 0.


20.
A . 0 =
1
A
0
A or 1
Answer: Option
Explanation:

1.0 = 0 and 0.0 = 0.