Download AKTU B-Tech 3rd Sem 2015-2016 EEC 302 Digital Electronics Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 3rd Semester (Third Semester) 2015-2016 EEC 302 Digital Electronics Question Paper

Printed Pages : 4 932 EEC-302
(Following Paper ID and Roll No. to be ?lled in your
Answer Book)
Roll No.
B. Tech.
(SEM. HI) THEORY EXAMINATION, 2015-16
DIGITAL ELECTRONICS ,
[Time : 3 hours] ,. [Total Marks : 100]
SECI?ION-A
1. Attempt all sections .All sections carry equal marks.
Write answer of each section in? short. (2X10=20)
(a)
(b)
'(c)
(d)
(e)
l 600
Explain Self-Complementing codes with an
example.
What is the basic difference between Latch and
F lip F lop? 1
Perform subtraction using 23 complement: 80-65 '
What are don?t care conditions ? Explain with
example. ~?
Construct 4 to 16 line decoder with ?ve 2 to 4
line decoders with enable.
(1) [P.T.O.]

(i) What is the difference between conventional ?ow-
chart and ASM chart ? '
(g) What is the difference between Combinational and
Sequential circuits ?
(h) Convert the following SOP Boolean expression
into POS from: ABC+A?B?C
(i) Implement a two-bit Magnitude Comparator.
0) Design a Full adder using two Halfadders.
SECTION - B
Attempt any ?ve questions ?'om this section. (10x 5:50)
2.
1 600
Explain J -K ?ip ?op. What is Race-Around condition in
J-K ?ip ?op and what is its remedy ?
De?ne an encoder. Also describe an 8X3 Priority
encoder.
Explain Carry-Look Ahead Generator. Also draw the
logic diagram of a BCD Adder.
What are Shi? Register Counters ? Explain in detail.
-With the help of neat diagram, explain the operations of
a Universal Shift Register.
(2) 13130302
What is a multiplexer ? Implement the given function
with:
(a) 8:1 MUX
(b) 4:1 MUX
(0) 2:1 MUX
F(A,B,C,D) = 2(0, 1, 2,3,4, 7, 8, 9, 1 1,14,15)
Find the minimal sum of products for a 5-variable
function using Quine Mc-Cluskey (or, Tabulation)
method. F = Z m(0, 1, 2, 9, 11, l2, 13, 27, 28, 29)
A sequential circuit has two JK ?ip-?ops A and B, two
inputs, x and y and one output, z. The ?ip-?op input
equations are:
J A=Bx + B?y? KA=B? xy?
J11: A?x KB=A + xy?
Z=Axy+Bx?y?
Obtain the logic diagram, state table, state diagram and
state equations.
(3) [P-T-OJ

SECTION - C
Attempt any two questions form this section. (ISXZ=30)
10. What is the difference betwaeen Synchronous and
Asynchronous Counters? Explain in detail Design a 4- '
bit Synchronous UP/DOWN Counter.
11 (a) An asynchoronous sequential circuit has two
internal states and one output. The two excitation
functions and one output function describing the
circuit are respectivelylgiven by:
Y. = X99 + xm? + X23.
Y2 = x2 + xlyl?y2 + X1, yl
z = x2 + y1
(i) Draw the logic diagram of the'circuit.
(ii) Derive the'transition table and output map.
(iii) Obtain a ?ow table.
(b) What are Static and?Dynamic Hazards ?
12. Give the classi?cation of Semiconductor Memories.
Implement the following functions with PLA and PAL:
F. =AB?+AC+AfBC?
F2 = (AC+BC)?
1600 (4) EEC-302