TRIBHUVAN UNIVERSITY
INSTITUTE OF SCIENCE AND TECHNOLOGY
2080 B.S.
Candidates are required to give their answers in their own words as far as practicable.
Group A
Long Answer QuestionsAttempt any Two questions.
- 1What is combinational circuit? Design a combinational circuit with four inputs lines that represent a decimal digit in BCD and four output lines that generate the 1's complement of the input binary patterns. (10)
- 2What is asynchronous counter? Design synchronous counter that counts the sequences of 0-1-4-6-7 using T flip-flop. (10)
- 3Implement the Boolean function $F(P,Q,R,S) = \Sigma(3,4,6,8,9,14)$ using: a. 8 to 1 multiplexer b. PLA c. Decoder (10)
Group B
Short Answer QuestionsAttempt any Eight questions.
- 4Perform the following operations: a. $(011101)_2 - (110011)_2$ using 2's complement b. $(89344)_{10} - (98654)_{10}$ using 9's complement (5)
- 5If $f(P,Q,R,S) = \Sigma(3,4,7,8,14)$ and $d(P,Q,R,S) = \Sigma(1,6,9,13)$ Simplify it using K-map and design circuit using minimum number of NAND gates. (5)
- 6What is drawback of RS Flipflop? Explain D Flip Flop in detail with Logic Diagram, characteristics table and Characteristics equation. (5)
- 7Design a full subtractor with necessary tables and logic diagram. (5)
- 8What is shift register? Explain 4-bit SISO and PIPO with timing Diagram. (5)
- 9Design an asynchronous Mod 11 up counter using T flip flop. (5)
- 10How race condition in JK flip flop can be resolved? Explain. (5)
- 11What is decoder circuit? Design 3 to 8 decoder circuit. (5)
- 12Write short notes on: a. State Diagram b. Encoder c. Parallel Adder (5)