Question Bank
Subject: Digital
Electronics Semester: 3rd
1.
Describe hexadecimal
number system. Explain conversion between decimal number system and
hexadecimal number
system.
2.
Sums of conversion
from one number system to other number system(Especially pay more attention to floating point
numbers) and other sums.
3.
Explain 1’s and 2’s
complements with suitable examples. Show the subtraction using complements.
4.
Explain excess-3 code.
Show addition in Excess-3 code with suitable examples.
5. Explain BCD codes with suitable example. Show addition
in BCD code
(Add (275 + 496) in BCD).
6. What is Gray code?
What are its applications?
7. Explain in brief ASCII code, Weighted binary code,
EBCDIC code ?
8. Explain following terms or Explain
important parameters of Digital IC ?
9. Explain NAND and NOR as a Universal gate?
10. Explain Saturated and Non-Saturated Logic ? Give names of
Saturated and Non-Saturated Logic families?
11. Explain Positive and Negative logic system?
12.Draw symbol, truth table, and write Boolean expression for
all the gates?
13. Discuss characteristics of TTL family.
14. Draw and explain working of TTL NAND Gate
Circuit? What is the main advantage of TTL TOTEM Pole Output?
15. Explain CMOS NAND gate?
16.State and Prove Demorgan’s Law.
17. State Properties of Boolean Algebra.
18. Draw logic circuit from given Boolean Expression and vice
versa?
19. Sums of Karnaugh Map ( especially 4 variable K-map ) ( SOP
and POS both)
20. Sums of Simplification of Boolean Expression, Prove the
given Boolean expression, Find SOP and POS, Canonical SOP and POS for given
function.
21.Compare Half Adder and Full Adder.
22.Design Half Adder circuit using NOR gates only.
23. Explain Full Adder and draw logic circuit for full adder
using only NAND gates?
24. Explain Full Subtractor and draw logic circuit for full
subtractor using A-O-I gates?
25. What is parity? Explain parity checker/generator and state
its application?
26.Explain BCD Adder?
27. Explain circuit diagram of parallel binary adder.
28. Draw and explain circuit diagram of 4-bit Binary Parallel
Adder/Subtractor.
29. Draw and explain binary to gray code convertor and gray to
binary code convertor?
30.Explain multiplexer and its state its applications. Show the
difference between multiplexer and decoder.
31.Explain 4 to 16 line decoder? Draw its circuit using NAND gates.
32.Write short note on BCD to seven segment decoder.
33.Difference between Combinational and Sequential
circuits?
34. Write short notes on following
35. Explain J-K master slave flip flop with logic diagram.
36. Explain the terms Asynchronous and Synchronous?
37.Conversion of one flip flop in to another flip flop.
38.Explain the positive and Negative edge triggering and
Level Triggering.
39. Draw circuit diagram of serial input serial output shift
register. Draw waveforms to shift 1010 in to the register.
40. What is shift register? What are the applications of shift
register? Explain 4 bit parallel in parallel out shift register.
41. Explain serial in parallel out shift register with neat
diagram.
42.Explain the universal shift register.
43.Classify the different types of memory.
44.What is advantage of EEPROM over EPROM? Explain EPROM and state its applications.
45. Give difference between RAM and ROM.
