Download GTU BE/B.Tech 2019 Winter 4th Sem New 2142406 Digital Electronics And Its Applications Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 4th Sem New 2142406 Digital Electronics And Its Applications Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? IV (New) EXAMINATION ? WINTER 2019
Subject Code: 2142406 Date: 13/12/2019

Subject Name: Digital Electronics and its applications

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Compute following in binary ? 10 ? (1010)2 = (________)2 03
(b) Answer following with necessary computation.
(1) (0011) Excess-3 = ____________
(2) 1.1H = ______________
04
(c) State logic families. Explain meaning of V IH, VOH, V IL and VOL. State these
values for 5V CMOS logic.
07

Q.2 (a) State universal gates. Draw implementation diagram of X= A+B function
using universal gate.
03
(b)
Simplify function F(x,y,z) = ?M(3,7) using K Map.
04
(c) Realize expression using minimum NOR gates only.
Y = AB' + AC' + C + AD + AB'C + ABC
07
OR
(c) Implement following using NAND gates only.
Y = (P + Q + R )( P' + Q' + R' )P
07
Q.3 (a) Draw schematic diagram of 8:1 multiplexer circuit using two 4:1 multiplexer
and necessary logic gates.
03
(b) Explain why combinational logic alone cannot be used for processor
implementation.
04
(c) Design full subtractor circuit using decoder and required gates. 07
OR
Q.3 (a) A and B are two 2-bit numbers. Draw schematic diagram for magnitude
comparator using 4 to 16 decoder which use A and B as inputs. Write output
equations for (1) A>B (2) A = B (3) A03
(b) Draw schematic diagram of 4-bit binary parallel subtractor. 04
(c) Design a single digit BCD adder using 4-bit binary adders. 07
Q.4 (a) What are the differences between latch and flip-flop? 03
(b) Define state and state diagram. 04
(c) Design synchronous 3-bit binary counter. 07

OR
Q.4 (a) What is NOVA RAM? 03
(b) Compare SDRAM and DRAM. 04
(c) Design a circuit for 4-bit shift right register. 07
Q.5 (a) Is it necessary to use WRITE signal with ROM in application circuits? Justify
your answer.
03
(b) Define (1) Accumulator (2) ALU register 04
(c) What is micro program control of microprocessor? Explain the concept. 07
OR

Q.5 (a) Construct D-flip flop using JK flip flop. 03
(b) Draw schematic of 2-bit ALU. 04
(c) Explain concept of PLA control of microprocessor. 07

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This post was last modified on 20 February 2020