## Digital Circuits And Logic Design Question Paper of 3rd Semester CSE74 Download Previous Years Question Paper 12

• Wednesday, September 07, 2016

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
l. Write short notes on :
(a) Convert (1 0 1 1.0 1 1 1 )2 to decimal equivalent.
(b) Convert the following BCD number to its decimal equivalent.
10011000.01000101
(c) Realize NAND gate with the help of NOR gates only.
(d) What are the advantages of CMOS memory chips over bipolar memory chips?
(e) What is multiplexer? Explain with the help of an example.
(f) How sequential circuits are different from the combinational circuits?
(g) What is the function of multivibraor?
(h) What is resolution in A/D converter?
(i) What is shift register?
(j) Why do we use PGAs?

SECTION-B

2. Minimize the following Boolean expression.

Y = (ABC+ABC)(ABC+ABC)

3. Design full subtract or using demultiplexer.

4. Design mod-8 down asynchronous counter using T flip-flops.

5. Draw and explain the circuit of TTL NAND gate with open collector.

6. State and prove De-Morgan's theorems.

SECTION-C
7. Write short notes on following :
(a) Successive approximation A to D Conversion Technique
(b) Multivibraor

8. Differentiate between custom and semi-custom VLSI design.

9. What is race-around condition? How it is eliminated in Master-Slave

J- K flip-flop ?