B.TECH - Semester 3 digital electronics Question Paper 2020 (may)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- 306 : DIGITAL ELECTRONICS (T) Time : 3 Hours Max. Marks : 100 PART - A Answer all questions. Each carry $\mathbf{2}$ marks.
- Convert A0F9.0EB ${ }_{16}$ to decimal.
- Reduce expression $f=A+B\lfloor A C+(B+\bar{C}) D\rfloor$
- Draw the circuit of a half subtracter with help of truth table.
- Explain toggle effect in JK flip flop.
- Draw the circuit of a 3 bit Johnson counter using D flip flop.
- Draw the circuit of a 2 bit ripple up Asynchronous counter using JK flip flop.
- What are the differences between Moore and Mealy circuits. Draw their state diagrams.
- What are the differences between synchronous and asynchronous sequential circuit.
- Explain working of CMOS inverter.
- Write short note on PROM. Answer any one question from each Module. Each full question carries 20 marks.
- Reduce using K-map the expression $f=\prod M(2,8,9,10,11,12,14)$ and implement the real minimal expression using NOR gate.
- Explain the working of a multiplexer and implement $F=\sum m(1,2,4,7)$ using an 4:1 MUX.
- Design a synchronous mode 6 counter with JK flip flops.
- Design an astable multivibrator using 555 timer to generate a square wave of frequency 5 KHz with $70 \%$ duty cycle and explain its working with the internal diagram.
- Draw the state diagram and state table of D and T flip flops for Mealy model.
- Draw the state diagram and the state table for a Moore type sequence detector to detect the sequence 1010.
- With neat circuit diagram explain the working of CMOS inverter and CMOS NAND gate.
- With help of neat diagram explain the working of TTL NAND gate circuit. Also explain the advantages and disadvantages of totem-pole arrangement. 4699