DIGITAL LOGIC DESIGN previous question paper for JNTU university students Dept: CSE,IT,CSSE

DIGITAL LOGIC DESIGN previous question paper for JNTU university students Dept: CSE,IT,CSSE

DIGITAL LOGIC DESIGN previous question paper for JNTU university students Dept: CSE,IT,CSSE

II B.Tech I Semester Regular Examinations, November 2007

DIGITAL LOGIC DESIGN

( Common to Computer Science & Engineering, Information Technology

and Computer Science & Systems Engineering)

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks

⋆ ⋆ ⋆ ⋆ ⋆

1. (a) Perform subtraction with the following unsigned decimal numbers by taking
10’s complement of the subtrahend. Verify the result. [3+3+3+3]
i. 5250 - 1321
ii. 1753 - 8640
iii. 20 - 100
iv. 1200 - 250
(b) Convert the given gray code number to equivalent binary
1001001011110010 [4]
2. (a) Draw the logic diagram corresponding to following expressions without sim-
plifying them.
i. (A + B) (C + D) ( A’ + B + D)
ii. (AB + A’B’)(CD’ + C’D)
(b) Obtain the complement of the following Boolean expressions. [8+8]
i. x’yz + x’yz’ + xy’z’ + xy’z
ii. x’yz + xy’z’ + xyz + xyz’
iii. x’z + x’y + xy’z + yz
iv. x’y?z’ + x’yz’ + xy’z’ + xy’z + xyz’.
3. (a) Show that A B = (A + B) +