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Sample Question Paper – I

9037
Course Name Course code Semester Subject Duration :- Computer Engineering Group :- CO/CM/CD/IF :- Third :- Digital Techniques :- 3 hours

Marks: 80

Instructions: 1. All questions are compulsory. 2. Figures to the right indicates full marks. 3. Use of non-programmable calculator is permissible. Q 1: Attempt any Eight of the following: (8 x 2 = 16)

a) Define Fan-out & Noise margin. b) Represent timing diagram of digital signal for positive & negative logic in TTL. c) Compare TTL & CMOS logic families(any four points). d) Draw logic symbol & truth-table for EX-OR gate. e) Simplify using Boolean algebra_ _ _ A.B + A.B + A.B f) Draw block diagram of 4:1 MUX and give its truth table. g) Draw Full Adder using two Half adders. h) Draw neat diagram of clocked S-R flip-flop & write its truth-table. i) Differentiate between static & dynamic RAM j) Give the classification of different types of semiconductor memories. Q 2: Attempt any Three of the following: a) Draw circuit for i) AND using NOR ii) OR using NAND. b) State & prove De Morgan’s Theorems. c) Prove using De Morgan’s Theorem – ______________ ______ ______ (A + B) + (C+ D) = (A + B) (C+ D) _______ __ ___ A.B + C.D = AB . CD (4 x 3 = 12)

i)

ii)

d) Realize the following Boolean expression using basic gates.

1

i) ii)

______ Y = (A + C) (B+ C) _ _ Y = A.B + B. C (4 x 3 = 12)

Q 3: Attempt any Three of the following: a) Draw 9-bit odd parity generator using IC 74180. b) Draw & explain half subtractor. c) Implement the following function using 8:1 MUX. Y = ∑m (0, 2, 3, 6). d) Implement following expression using NAND gates only. _ _ Y = A.B + B.C + C.A Q 4: Attempt any Four of the following:

(4 x 4 = 16)

a) Describe the function of 4-bit SISO shift register with the help of block diagram , truth-table, timing diagram. b) State four applications of counters. c) What is race around condition? How it can be avoided? d) Compare RAM & ROM. e) Design... [continues]

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