# Digital Logic | BSc.CSIT (TU) Question Paper 2073 | First Semester

## First Semester | First Year | Tribhuvan University Old Question Collection | Question Bank Digital Logic, Year: 2073 Computer Science and Information Technology (CSc.111)

OR you can read question paper online below;
Full Marks: 60 | Pass Marks: 24 | Time: 3 hours.

Candidates are required to give their answers in their own words as far as practicable.
The figures in the margin indicate full marks.

Attempt two questions (2×10=20)

1. Explain the magnitude comparator and also design a logic diagram for 4 bit magnitude comparator.
2. What do you mean by decoder? Design a 3 to 8 line decoder using 2 to 4 line decoder and explain it.
3. What do you mean by ripple counter? Explain the design procedure of sequential circuits.
Attempt any eight questions (2×10=20)
4. Convert the following hexadecimal number to decimal and octal numbers.
a) 4FF
b) 6FED
5. Explain the error detection code with example.
6. Explain the duality theorem with example.
7. Design half adder logic circuit using only universal gates.
8. Draw a logic circuit of 8*1 multiplexer.
9. Design the 4 bit parallel binary adder.
10. Explain the PLA with the block diagram.
11. Explain the R-S flip flop with truth table.
12. Explain the shift register with example.
13. Write short note on (any two):
a) Binary counter
b) State reduction
c) Negative edge triggering
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