M.Sc. DEGREE EXAMINATION, APRIL 2016
Second Semester
Physics
DIGITAL ELECTRONICS PRINCIPLES
(2011 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 2 20)
Answer all questions.
All questions carry equal marks.
1. What is hexadecimal odometer?
2. Illustrate with example complement method of
subtraction.
3. Give the truth table for Exclusive OR gate. Write down
the uses of this gate.
4. Explain 'Rolling' and 'Overlapping techniques in a
Karnaugh map.
5. What is an encoder? When it is used?
6. Explain the use of binary multiplier.
7. Convert an R-S flip flop into a clocked R-S flip flop.
8. When you will call a counter as asynchronous counter?
Sub. Code
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9. Mention the function of programmable counter
10. What are demultiplexers?
Part B 5 25)
Answer all questions.
All questions carry equal marks.
11. What is excess 3 code? Explain the method of
converting decimal number into its excess-3 code
with an example. How it is used with BCD
numbers?
Or
Explain in detail parity method for error detection
and corrections with examples.
12. State and prove DeMorgan's theorems.
Or
Explain Quine-McClausky method of minimization
procedure with example.
13. Describe the working of a binary divider with
necessary diagram.
Or
Explain the complement method of subtraction
with two examples.
14. Show how to convert a J-k flip flop into a D-type flip
flop? Give its truth table.
Or
Explain the principle of ring counter and discuss its
uses.
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15. Draw the diagram for a mod-10 counter and explain
its operation.
Or
Construct a 3 bit synchronous counter using
J-K flip flop.
Part C 10 30)
Answer any three questions.
All questions carry equal marks.
16. Explain the method of converting the binary numbers to
octal numbers. Convert the following three binary
numbers to octal numbers
10101111
1101.0110111
1010011.101101.
17. Minimize the function F using
Karnaugh map, and realize in NOR logic.
18. Draw the full adder circuits using NAND gates only
and NOR gates only.
Explain the functioning of the circuits and show that the
output is that of a full adder.
19. Explain the action of master slave flip flop with a neat
diagram. How the race around condition is eliminated in
this system.
20. Give the circuits of direct coupled edge triggered D flip
flop and explain its operation with necessary diagrams.