U.G. DEGREE EXAMINATION, APRIL 2018
Computer Science
Allied DIGITAL ELECTRONICS
(CBCS 2011 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. What are the differences between analog computer and
digital computers?
2. What are the universal logic gates? Draw the truth table
and symbols?
3. Write the technical concept of combinational logic circuit.
4. Write the truth table for the code conversion from BCD to
excess-3 code.
5. Draw the Basic flip-flop circuit with NAND gates.
6. What is meant by Ring Counter?
7. What are the four levels of integration?
8. What are the configurations of Programmable Logic
Device
9. What are the applications of A/D converters?
10. Define Accuracy and Resolution of A/D and D/A
converters.
Sub. Code
1BCESA1/
1BCEA1
AFC-10725
2
WS3
Part B x 5 25)
Answer all questions, choosing either or
11. Explain about Radix complement and diminished
radix complement.
Or
Explain the conversion between canonical forms.
12. Write the Design procedure of a combinational logic
circuit.
Or
Design a Half-Substractor.
13. Explain about the Digital clock.
Or
Explain with circuit diagram of a JK master -slave
flip-flop.
14. Explain the positive logic NAND gate and positive
logic NOR gates with truth table.
Or
Describe about DTL basic Nand gate.
15. Explain about the counter method of A/D
conversion.
Or
Explain about the Binary Ladder circuit.
AFC-10725
3
WS3
Part C x 10 30)
Answer any three questions.
16. Do the following
Using 10's complement substract 72532 3250
Using 10's complement substract 3250 72532
Given the two binary numbers X 1010100;
Y 1000011, perform
X Y and Y X using complement.
17. Explain about the Programmable Logic Array with
block diagram.
18. Explain about the Serial transfer of Shift Registers.
19. Describe about Bi-polar transister characteristics.
20. Describe the Simultaneous method of A/D conversion.
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