BCAN-101 Digital Electronics Past Paper 2018-19 PDF

http://www.makaut.com CS/BCAN/Odd/SEM-1/BCAN-101(New)/2018-19 # MAULANA ABUL KALAM AZAD UNIVERSITY OF TECHNOLOGY, WEST BENGAL Paper Code: BCAN-101 ## DIGITAL ELECTRONICS Time Allotted: 3 Hours Full Marks: 70 The figures in the margin indicate full marks. Candidates are required to give their answers in their own words as far as practicable. ## Group - A (Multiple Choice Type Questions) 1. Choose the correct alternative for any ten of the following: 1× 10=10 - (i) in a multiplexer, the output depends on its - (a) Data inputs - (b) Select inputs - (c) Select outputs - (d) None of these - (ii) Which of the following condition is not allowed in SR flip-flop? - (a) S=0 R=Q - (b) S=0 R=1 - (c) S=1 R=0 - (d) S=1 R=1 - (iii) The logical expression Y=A+AB+ABC+A' BC' D+1 is equivalent to - (a) A + C - (b) 1 - (c) A - (d) A - (iv) A flip-flop has - (a) one stable state - (b) no stable states - (c) two stable states - (d) None of these - (v) The dual of a Boolean expression is obtained by - (a) interchanging all 0s and 1s - (b) interchanging all 0s and 1s, all + and * signs - (c) interchanging all 0s and 1s, all + and * signs and complementing all the variables - (d) interchanging all + and * signs and complementing all the variables - (vi) A+A'B is equal to - (a) A+B - (b) A - (c) B - (d) A'+B - (vii) 11101+1100 is equal to - (a) 10.1101, - (b) 100.1101 - (c) 10.01101 - (d) None of these - (viii) In general, a sequential logic circuit consists of - (a) only flip-flops - (b) only gates - (c) flip-flops and combinational logic circuits - (d) only combinational logic circuits - (ix) Race condition arises in - (a) S-R Latch - (b) S-R F/F - (c) J-K F/F - (d) T F/F - (x) When two *n* bit binary numbers are added, the sum will contain at most - (a) *n* bits - (b) *n*+1 bits - (c) *n*+2 bits - (d) *n*+n bits - (xi) While performing BCD addition, if the value of each 4-bit group becomes ______ we add 6 with that group - (a) greater than 9 - (b) greater or equal to 9 - (c) greater than 6 ## Group - B (Short Answer Type Questions) Answer any three of the following. 5x3=15 2. Difference between Synchronous and Asynchronous counters. 3. Simplify the expressions: - (i) A=XYZ+XY'Z+XB' - (ii) B=P+P'Q+ P'Q'R + P'Q'R'S 2+3=5 4. Subtract (-33) from (-57) using 2's complement method. Convert (4536)<sub>10</sub> to - (i) 2421 code - (ii) 5421 code 3+2=5 5. Draw the truth table and logic circuit of a full-subtractor. Using K-map find out the expression for difference (D) and borrow (B). 6. What is flip-flop? What is race condition? 1+4=5 ## Group - C (Long Answer Type Questions) Answer any three of the following. 15x3=45 7. - (a) Using K-map method minimize the following expression: F(w,x,y,z) = m2(1,5,6,12,13,14) + d2(2,4). Implement the logic circuit using NAND gates only. - (b) Implement Ex-OR gate using NAND Gate and NAND gate using NOR gate. (5+4)+(3+3)=15 8. - (a) Define excitation table of flip-flup and propagation delay. - (b) Using the logic diagram convert a J-K flip-flop D flip-flop and T flip-flop. - (c) Design a J-K master-slave flip flop with circuit diagram and give the truth table. 5+5+5=15 9. - (a) Write down the simplified Boolean expression in - (i) sum of product form and - (ii) product of sum form for Y(A,B,C,D)=Π.Μ(0,1,3,5,6,7,9,10,11,12,13,15) - (b) Implement a full adder using 2 half adders. (4+4)+7=15 10. - (a) Design a carry look ahead adder. - (b) Design a combinational logic circuit to implement 4-bit odd parity checker. 9+6=15 11. Write short notes on any three of the following: 5x3=15 - (i) PIPO - (ii) Ripple Counter - (iii) 4-bit parallel adder - (iv) Gray Code - (v) Master slave J-K flip-flop http://www.makaut.com Whatsapp @ 9300930012 Your old paper & get 10/- पुराने पेपर्स भेजे और 10 रुपये पार्य, Paytm or Google Pay से http://www.makaut.com

BCAN-101 Digital Electronics Past Paper 2018-19 PDF

Document Details

Tags

Related

Summary

Full Transcript

Upgrade to continue