TAMILNADU POLYTECHNIC COLLEGE(AUTONOMOUS
) MADURAI 11.
DEPARTMENT OF ELECTRICAL AND ELECTRONICS
ENGINEERING.
MODEL EXAMINATION -SEPTEMBER 2011
Analog AND DIGITAL ELECTRONICS
Time: 3 hours Max.
Marks:75
Note:
Part A questions carry each 1 mark and answer all questions.
Part B questions carry each 3
marks and answer all questions.
Part C questions carry each
10 marks and answer all questions by selecting
“either” OR “.
PART- A
1.
What is virtual ground?
2.
What is called a comparator?
3.
state boolean
laws.
4.
What is called
encoder?
5.
Define :
mutiplexer.
6.
Define fanout.
7.
Define
preseltable counter?
8.
What is mod 7
counter?
9.
What do you mean
by D/A converter
10.
State difference between static & dynamic
memory?
PART-B
11.
What are the
feature of IC regulator is LM 317?.
12.
Construct the NOR
Gate using only Nand gate.
13.
Difference between
synchronous and asynchronous counters
14.
Give the logic
digram & truth table of JKMS FF?
15.
Write a short
notes on sampling.
PART-C
16.
a) Explain Zero
crossing detector using OP-AMP.
OR
b) Explain
a monostable Mulivibrator using
IC 555 with neat digram.
17.
a) State &
prove Demorgan’s theroem.
OR
b) Simplify the folloing boolean
experssion using K-MAP &
implement y = ABC+ABC +ABC+ABC
18.
a) Draw a logic digram of a Half –adder &
explain its working.
OR
b) Draw
a neat sketch of TTL transistor circuit & explain its working
priniciple?
19.
a) Write the logic digram explain the decade
counter.
OR
b) With logic digram explain the operation of
BCD to seven sgement
decoder
20.
a) With the Briefly explain the operation of
successive approximation
method of A/D converter
OR
b)
with neat sketch and explain the working priciple of
R-2R ladder D/A converter.
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