Digital Electronics 2022 Question Paper — Government College of Engin…
The 2022 Digital Electronics previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.
- University: Government College of Engineering and Technology, Jammu
- Subject: Digital Electronics
- Course: DIGITAL ELECTRONICS
- Branch: Electronics and Comm. Engg.
- Year: 2022
- Paper: end-term
- Duration: 180 minutes
- Total marks: 100
Instructions
- Attempt five questions in all selecting at least two questions from each section.
- Each question carries equal marks.
Questions
Section-A
- Q1. Perform the following : (a) Convert $(2AC5.D)_{16}$ to Octal (b) Add $(FA7)_{16}$ and $(1FD)_{16}$ (c) Perform $(756)_8 - (637)_8 + (725)_{16}$ and express the answer in octal form (d) What are self-complementing codes ? (e) Perform $(\text{B02})_{\text{H}} - (98)_{\text{H}}$ using 15's complement method. [20 marks]
- Q2. (a) Give comparison of different logic families. (b) Why NAND and NOR are called universal gates ? Construct a logic circuit using NAND gates only for the expression $\overline{((A + B) \cdot C) \cdot D}$ [20 marks]
- Q3. (a) Reduce the expression using K-map $F(A, B, C, D, E) = \sum m(0, 1, 2, 3, 10, 12, 13, 14, 20, 21, 22, 23, 26, 27, 28, 29, 30, 31)$ (b) Add the BCD numbers $589 + 199$. [20 marks]
- Q4. Simplify and implement using NAND gates only. (i) $AB + \overline{AC} + \overline{ABC}(AB + C)$ (ii) $\overline{(A + B + C)} (\overline{A} + \overline{B}) (AB + \overline{C})$ [20 marks]
Section-B
- Q5. (a) Design a 2-bit digital comparator using gates. (b) Design a BCD to Gray code converter [20 marks]
- Q6. (a) Implement the following function using 8:1 MUX : $F (A, B, C, D) = \sum M (0, 1, 3, 5, 8, 9, 15)$ (b) Discuss priority encoder. [20 marks]
- Q7. (a) Convert SR to JK flip-flop. (b) What is race around condition ? How to eliminate it ? [20 marks]
- Q8. (a) Design the operation of 4-bit twisted ring counter with the help of neat diagram. (b) With the help of neat diagram, explain the operation of PISO shift register. [20 marks]