## Digital Circuits And Logic Design Question Paper of 3rd Semester CSE74 Download Previous Years Question Paper 10

• Wednesday, September 07, 2016
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Roll No.
Total No. of Questions : 09
B.Tech.  (Sem.–3)
DIGITAL CIRCUITS & LOGIC DESIGN
Subject Code : CS-205
Paper ID : [A0453]
Time : 3 Hrs.
Instruction to candidates :
1.      Section –A is Compulsory.
2.     Attempt any Four questions from section –B
3.     Attempt any Two questions from section –C

Section –A
1.
a.     Convert binary number 1001 into gray.
b.     Find SOP form of f= AB +BC +A
c.      Implement half subtract or using NAND gates.
d.     Find % age resolution  of a 12 bit BCD input D/A  converter which has full scale o/p of 29.97 V.
e.      Convert a  flip flop into a T flip flop.
f.         Differentiate between Asynchronous counter and Synchronous counter
g.     What is significance of figure of merit of flip flops.
h.     Design a 4: 1 mux.
i.       Classify logic families on the basis of number of gates on a single chip
j.       Write pros and cons of SRAM and DRAM cell.

Section –B

2.      Design a combinational ckt with 3 input and 1 output. The output is high only when more than one input is high.

3.     Design a MOD 6 counter using T-flip flops

4.     What are multivibraor circuits. Explain Actable multivibraor with the help circuit diagram.
5.     Explain the operation of two input TTL NAND gate.

6.     Using Boolean Algebra show that
(A+B)(a+C)(B+C) = AC+BA
Section –C

7.     Design a comparator circuit which compares two 2 bit numbers. It has three outputs A>B, A< B and A=B. also show that A<B = A>B.A = B

8.     Design a three bit MOD 6, unit distance up-down counter.

9.     What are programmable logic devices. What are their advantages. Explain in detail the architecture of a programmable logic device.