G12303 Digital Logic Design DECE Question Paper Model : psgpolytech.ac.in
College : Psg Polytechnic College
Degree :DECE (Diploma in Electronics & Communication Engineering)
Semester : III Sem
Year : II Year
Subject : G12303 Digital Logic Design
Document Type : Model Question Paper
Website : psgpolytech.ac.in
Download Model/ Sample Question Papers :https://www.pdfquestion.in/uploads/psgpolytech.ac.in/6206-G12303%20%20DIGITAL%20LOGIC%20DESIGN.pdf
Digital Logic Design Question Paper :
Instructions :
1. Group A and Group B questions should be answered in the Main Answer book.
2. Answer any TEN questions in Group A. Each question carries three marks.
Related : PSG Polytechnic College G12302 Electronic Devices & Circuits Question Paper Model : www.pdfquestion.in/6198.html
3. Answer ALL questions either (a) subdivision or (b) subdivision in Group B. Each question carries 14 marks.
PSG POLYTECHNIC COLLEGE, COIMBATORE – 641 004
G12303 Digital Logic Design
Model Question Paper
Time : 3 Hours
Max.Marks : 100
Group – A Marks : 10 x 3 = 30
1. Write the advantages in operating as digital mode
2. Convert the following numbers into its decimal equivalent :
(i) (314)8 (ii) (1011 1100)2
3. Perform the following division in binary; 11011 / 101
4. Construct the two basic gates using universal gates.
5. State and its prove deMorgan’s theorem
6. Simplify the Boolean expressions to a minimum number of literals : xyz’+ x’yz+x’yz’.
7. Draw the block diagram of 4X1 multiplexer and write its truth table.
8. Using k-map, find the simplified Boolean equation for the given values.
F(a,b,c,d)=S(3,4,5,7,9,13,14,15)
9. Design a half adder and simplify using K-map.
10. Define level triggering and edge triggering.
11. Show the characteristics equation for the complement output of JK flip flop is Q’(t+1)=J’Q’+KQ’.
12. Draw the logic diagram of 4 bit SIPO shift register
13. Give the number of bytes stored in the memories listed below: (i) 8K*16 (ii) 2T*8
14. Compare the EPROM & Flash Memory
15. Draw the internal organization diagram of a 64X4 RAM
Group– B :
Marks : 5 x 11 = 55
16. a) (i) Convert the following binary numbers to hexadecimal & to binary (5)
(1) 1.10010 (2) 110.010
(ii) How many printing characters are there in ASCII? How many of them are special characters. (9)
(OR)
b) (i) Perform the subtraction on the given unsigned binary numbers using the 2’s complement (5)
(1) 10011-10001 (2) 100010-100011
(ii) Represent the decimal number 5137 in (1) BCD (2) Gray code (3) ASCII (9)
17. a) (i) Express the Boolean function F=A+B’C as a sum of minterms. (5)
(ii) Find the complements of expression (1) (x’+y+z’)(x+y’) (9)
(OR)
b) With the circuit diagram, explain the principle of operation 2 input TTL NAND gate.
18. a) Construct a 16*1 multiplexer with two 8*1 and one 2*1 multiplexers.
(OR)
b) Implement full adder with a decoder & NAND gates. The adder inputs are A, B, C & D and the outputs are S & Co.
19. a) Construct a JK flip flop , using a D-Flip flop, a 2-1 line multiplexer, and an inverter.
(OR)
b) What is the difference between serial & parallel transfer? Which transfer method is the fastest one? Explain how to convert serial data to parallel.
20. a) Draw a PLA circuit to implement the following functions:
i) F1= A’B+AC’+A’BC’ ii) F2=(AC+AB+BC)’
(OR)
b) Explain in detail about the RAM.
Digital Electronics Question Paper :
Time : 3 Hours
Max.Marks : 100
Group – A Marks : 10 x 3 = 30
1. Write the advantages of digital system over analog system.
2. Perform the following conversions :
(i) Decimal number 5789 to Hexadecimal, Octal numbers.
(ii) 1132 octal number to Decimal, Hexadecimal numbers.
3. What are characteristics of TTL-
4. What is an ASCII code- Give an example.
5. Draw Encoders and Decoders block diagram. What are their applications-
6. Draw a seven segment Decoder diagram
7. What is a parity bit- Give applications of parity bit.
8. Define Half adder and Full adder.
9. What is a Scmitt trigger-
10. Define Flip-Flop. What is the principle of SR Flip-Flop-
11. Convert the following Flip Flops (a) SR to JK (b)JK to T (c)JK to D
12. What are counters and Registers- Mention their applications.
13. Define ADC. What are the types of ADC-
14. In a 8 bit DAC, the weight of LSB is 0.010V. What is the voltage for the following words-
(a)1111 1111 (b)1001 1001
15. What is a R-2R ladder network- Draw its diagram.