Thapar University 2007 B.E DIGITAL ELECTONICS - Question Paper
THAPAR UNIVERSITY PATIALA
ELECTRONICS AND COMMUNICATION ENGINEERING DEARTMENT
Thapar University Department of Electronics and Communication Engineering MID SEMESTER 1 EXAM Subject: Digital Electronics (EC001) Branch: BE(ECE, ELE, EIC, CSE )
MM: 24 Time allowed: lhr
Instructions: Attempt all parts of single question at one place only.
Draw the diagrams neatly and assume any missing data.
l.Q a) Convert the following: (1101.11)2 = ( )io= ( )i6 ( )s (2)
b) Perform the following subtraction: i) 0011.1001 - 0001.1110 ii) 01100 - 00011 (2)
2.Q a) Prove the following identity: A+AB = A+B (1)
b) How many no. of gates are required to realize the Boolean function after minimizing. (3)
Y= ((A*+B) + (A+B)) + ((A\B) + (A.B))
.Q a) F(A,BC>D) = m(0,2,7,8,10,l i) Obtain the minimal expression using tabular method. (3) /) Realize the function f = Xm(0,1,3) using suitable multiplexer. (1)
4.Q a) A combinational circuit is defined by the following two functions:
FI xy+ xyz
F2= x*+y
Design the circuit with a suitable decoder and external gates. (2)
b) Simplify the following Boolean function using K map
F(A,B,C,D) = riM(0,4,5>6,8,12,13).d(2,14) (2)
5.Q If two BCD numbers 1001 and 1000 are added with Cin-0. What will be the result obtained by the BCD adder. Explain using suitable diagram and logic levels of BCD adder. (4)
j6.Q a) Design a 3 bit odd parity generator and give the logic diagram. (2)
) Explain the functioning of Multiplexers. (2)
OR
a) Design a circuit which compares two 3 bit nos. A & B to check if they are equal. The circuit has one output X, so that X=1 when A=B and X=0 when AB. (3)
b) What is the difference between decoder, encoder and code converter. (1)
GOOD LUCK-
|
Attachment: |
| Earning: Approval pending. |
