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Electronics and Communication Engineering - Digital Electronics

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Exercise :: Digital Electronics - Section 5

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.
A. XYZ
B. X Y Z
C. X YZ + XY Z
D. XY + YZ + ZX

Answer: Option D

Explanation:

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

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17. 

If A = 0101, then A' is
A. 1010
B. 1011
C. 1001
D. 0110

Answer: Option B

Explanation:

A' = 1010 + 1 = 1011.

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18. 

11011 in gray code = __________ .
A. 100102
B. 111112
C. 111002
D. 100012

Answer: Option A

Explanation:

Change to decimal and then to binary.

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19. 

In the circuit of the given figure, Y =
A. 0
B. 1
C. X
D. X

Answer: Option A

Explanation:

XX = 0.

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20. 

A . 0 =
A. 1
B. A
C. 0
D. A or 1

Answer: Option C

Explanation:

1.0 = 0 and 0.0 = 0.

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