B.TECH - Semester 3 digital electronics Question Paper 2021 (oct)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- 306 ：DIGITAL ELECTRONICS（T） （2013 Scheme） Time ： 3 Hours Max．Marks ： 100 Answer all queslions ： 1．Defermine 2＇s complement of the following numbers （a） 01011100 （b） 001001110 2．Draw logic diagram of hall adder with truth table． 3．How a J－k Ilip－llo...
- Describe the terms (a) Far-oul
- Describe the terms (b) Propagalion delay. $$ (10 \times 2=20 \text { Marks }) $$
- (a) Draw and explain BCD adder circuil. 10
- (b) Skelch a NAND only logic circuit for the expression $Y=A B^{1}+A C+A D, 10$
- (a) Implement the function using 8:1. MUX $$ F(A, B, C, D)=\sum(D, 1,3,4,8,9,15) $$
- (b) Explain operalion of 4-bil magnilede comparator circuit. 12 Module - 2
- (a) Design a decade counter lo counti in Excess -3 sequence. ..... 12
- (b) Compase combinalional and sequential circutis. ..... 8
- (a) Draw aslable, multivibralor using 555 IC and explain the working ..... to
- (b) Design a divide-by-96 counler using IC 7490. ..... 10
- (a) Design a sequential circuil with two D flip-flops and one inpul x . When $\mathrm{x}=0$, the stale of circuil remains same. When $x=1$, slate passes through sate transition from OD to 01 to 11 to 10 and back to 00 and repeats.
- (b) What is a slate diagram and what are the informations obtained from slate diagram?
- (a) Design a 3 bit synchronous counter using J-K Mip-llops.
- (b) Draw an asynchronous decade counter and explain ils operation and draw the waveforms
- (a) Wrile descriptions of :
- (i) RAM and types of RAM (ii) ROM and types of ROM
- (b) Which are the different modelling lechniques used in HDL? Explain Behavioral modelling. 16 (a) Draw CMOS-NAND circuit and explain the operalion with truth lable.
- (b) Draw a D flip-llop and write the VHDL Code for D llip-llop with clock. ( $4 \times 20=80$ Marks)