Tribhuvan University
Bachelor of Information Technology
Semester 1 · TU Board 2080
Course Title: Digital Logics (BIT103)
Full Marks: 60Pass Marks: 24Time: 3 hours
Candidates are required to give their answers in their own words as far as practicable.
Group A
Attempt any Two questions.(2 × 10 = 20)
- 1.10
Define BCD code. Design BCD to Excess-3 Code converter with truth table and logic diagram.
- 2.10
Define combinational logic circuit. Design a combinational circuit whose input is a four-bit number and whose output is the 1's complement of the input number.
Answer comingAlso asked in 2077
- 3.10
Define parallel counter. Design MOD-12 synchronous up counter along with state diagram, timing sequence and timing diagram.
Group B
Attempt any Eight questions(8 × 5 = 40)
- 4.5
Convert (591.62)₁₀ into hexadecimal and octal number system.
Answer comingAlso asked in 2079, 2078
- 5.5
Why NAND and NOR gates are called Universal logic gates? Realize NOR as Universal logic gates.
- 6.5
Simplify: F = X Y Z' + X Z' + X' Y + X" Y Z' using K-Map in both SOP and POS.
- 7.5
Define PLDs. Implement the given functions with ROM. F1 = ∑(0,1,2) F2 = ∑(0,2,3)
- 8.5
Describe the clocked master-slave J-K flip-flop with its operation table.
- 9.5
What is forbidden state in SR flip flop? Convert SR to JK flip flop.
- 10.5
Differentiate between ring counter and Johnson counter.
- 11.5
Explain the operation of 4-bit Parallel-In parallel-Out Shift register with data input 1010.
- 12.5
Write short notes on: (Any two) a. ASCII Code b. Logic micro operation c. State table
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