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1. Attempt any FIVE of the
following: 10
a) Write the radix of binary,
octal, decimal and hexadecimal number system. ***
b) Draw the circuit diagram for
AND and OR gates using diodes.
c) Write simple examples of
boolean expression for SOP and POS. *
d) State the necessity of
multiplexer.
e) Draw logic diagram of T
flip-flop and give its truth table.
f) Define modulus of a counter.
Write the numbers of flip flops required for Mod-6 counter. *
g) State function of preset and
clear in flip flop.
h) Define fan-in and fan-out of a
gate.
i) Compare between synchronous and
asynchronous counter (any two points).
j) State two specification of DAC.
**
e) Write the gray code to given
no. (⊥⊥0⊥)2
= (?) Gray. *
j) Define encoder, write the IC
number of IC used as decimal to BCD encoder.
k) Draw the logical symbol of
EX-OR and EX-NOR gate. *
2. Attempt any THREE of the
following: 12
a) Draw the block diagram of
Programmable Logic Array. *
b) Convert - *
(i)
(255)10 = ( ? )16 = ( ? )8
(ii)
(157)10 = ( ? )BCD = (? ) Excess3
c) Draw the symbol, truth table
and logic expression of any one universal logic gate. Write reason why it is
called universal gate.
d) Minimize the following
expression using K-Map. f(A, B, C, D) = Σm (0, 1, 2, 4, 5, 7, 8, 9, 10) **
e) Simplify the following and
realize it Y = A + ABC + ABC + ABC + AB
f) Explain the flowing
characteristics w.r.t logic families:
(i)
Noise margin
(ii)
Power dissipation
(iii)
Figure of merit
(iv)
Speed of operation
g) Draw logic diagram of half
adder circuit.
b) Simplify the following Boolean
Expression and Implement using logic gate.
ABC
D + + ABCD ABCD + ABCD
d) Implement the following
functions using demultiplexer.
f1
= ∑m (0, 2, 4, 6) f2 = ∑m (1, 3, 5)
3. Attempt any THREE of the
following: 12
a) Compare TTL and CMOS logic
families on the basis of following: *
(i)
Propagation delay *
(ii)
Power Dissipation *
(iii)
Fan-out *
(iv)
Basic gate *
(v) Noise immunity
(vi) Speed Power Product.
b) Describe the function of Full
Adder Circuit using its truth table, K-Map simplification and logic diagram. *
c) Realize the basic logic gates,
NOT, OR and AND gates using NOR gates only. *
d) Describe the working of JK
flip-flop with its truth table and logic diagram. *
e) Describe the operation of R-5
flip-flop using NAND gates only.
f) Give classification of memory
and compare RAM and ROM (any four points).
g) State the applications of shift
register.
h) Realize the following logic
expressions using only NAND gates. (i) OR (ii) AND (iii) NOT
i) Describe the working of 4 bit
SISO (serial in serial out) Shift Register with diagram and waveform if input
is 01101.
4. Attempt any THREE of the
following: 12
a) Draw and explain working of 4
bit serial Input parallel Output shift register. **
b) Draw 16:1 MUX tree using 4:1
MUX.
c) Calculate analog output of 4
bit DAC for digital input 1101. Assume VFS = 5V. *
d) State De Morgan’s theorem and
prove any one. **
e) Design one digit BCD Adder
using IC 7483. *
f) Compare between PLA and PAL.
g) Describe the working of J-K
flip- flop and state the race around condition.
h) Describe the working of ring
counter using D flip flop with diagram and waveforms. *
5. Attempt any TWO of the
following: 12
a) Subtract using 2’s compliment
method (35)10 – (5)10. **
b) Design a 4 bit synchronous
counter and draw its logic diagram. *
c) Describe the working of
successive Approximation ADC. Define Resolution and conversion time associated
with ADC. **
d) Design basic logic gates using
NAND and NOR gate.
e) Design BCD to seven segment
decoder using IC 7447 with its truth table.
f) (i) Convert the following
binary number (11001101)2 into Gray Code and Excess-3 Code.
(ii) Perform the BCD Addition. (17)10 + (57)10
(iii)
Perform the binary addition. (10110 • 110)2 + (1001 • 10)2
g) Design a 4bit ripple counter
using JK flip flop, with truth table and waveforms. *
6. Attempt any TWO of the
following: 12
a) Design 4 bit Binary to Gray
code converter. **
b) Compare the following (Any
three points) *
(i)
Volatile with Non-volatile memory
(ii)
SRAM with DRAM memory
c) Give block schematic of decade
counter IC 7490. Design Mod-7 counter using this IC.
d) Design a mod-6 Asynchronous
counter with truth-table and logic.
e) Design ⊥:8
demultiplexer using 1:4 demultiplexer.
f) Draw the circuit diagram of 4
bit R-2R ladder DAC and obtain its output voltage expression.
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