Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem New 2142406 Digital Electronics And Its Applications Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142406 Date:17/05/2019
Subject Name: Digital Electronics and its applications
Time: 02:30 PM TO 05:00 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) Explain D?Morgans theorem with truth table. 03
(b) Fill in the blanks
(1) (101101)2 = ( )10
(2) (55)10 = ( )2
04
(c) Minimize the following Boolean function using sum of products (SOP):
f(a,b,c,d) = ?m(3,7,11,12,13,14,15)
07
Q.2 (a) What is universal logic gate? Give the name of universal logic gates. 03
(b) Define Boolean Algebra? Explain Duality Principles with example. 04
(c) Explain two input (i) AND (ii) OR and (iii) EX-OR gates. 07
OR
(c) Explain NAND as universal logic gate in detail. 07
Q.3 (a) What is K-map? What is disadvantage of K-map method? 03
(b) Compare Combinational logic and Sequential logic in tabular form. 04
(c) Design and explain full adder using 3 X 8 decoder. 07
OR
Q.3 (a) Design full adder using two half adder. 03
(b) Write a note on Binary Ripple Counter. 04
(c) Explain edge-triggered D Flip-flop and SR Flip-flop in detail. 07
Q.4 (a) Give the difference between Latch and Flip Flop. 03
(b) What is race around condition? 04
(c) Design & explain the block diagram of a 4:1 Multiplexer using 2:1 Multiplexer. 07
OR
Q.4 (a) Explain with necessary sketches PLA control. 03
(b) Design synchronous BCD counter. 04
(c) Design a circuit for 4-bit bidirectional shift register. 07
Q.5 (a) Define state and state diagram. 03
(b) Compare SRAM & DRAM in all aspects. 04
(c) Design and explain 3 bit data comparator circuit. 07
OR
Q.5 (a) Explain in brief Scratchpad memory. 03
(b) Explain Accumulator and ALU status register in brief. 04
(c) Discuss Hardwired vs. Micro-programmed control unit. 07
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This post was last modified on 20 February 2020