GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Code: 2142406
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER-IV(NEW) — EXAMINATION — SUMMER 2019
Subject Name: Digital Electronics and its applications
Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) Explain D’Morgans theorem with truth table. | 03 |
(b) Fill in the blanks
| 04 | |
| (c) Minimize the following Boolean function using sum of products (SOP): f(a,b,c,d) = Sm(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 | ||
| 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 | ||
| Design full adder using two half adder. | 07 | |
| Q.4 | (a) Write a note on Binary Ripple Counter. | 03 |
| (b) Explain edge-triggered D Flip-flop and SR Flip-flop in detail. | 04 | |
| (c) Give the difference between Latch and Flip Flop. What is race around condition? | 07 | |
| Q.5 | (a) Design & explain the block diagram of a 4:1 Multiplexer using 2:1 Multiplexer. | 03 |
| (b) Explain with necessary sketches PLA control. | 04 | |
| (c) Design synchronous BCD counter. | 07 | |
| OR | ||
| (a) Design a circuit for 4-bit bidirectional shift register. | 03 | |
| (b) Define state and state diagram. Compare SRAM & DRAM in all aspects. | 04 | |
| (c) Design and explain 3 bit data comparator circuit. | 07 | |
| OR | ||
| (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 |
Date: 17/05/2019
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Total Marks: 70
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