TRIBHUVAN UNIVERSITY
INSTITUTE OF SCIENCE AND TECHNOLOGY
2081 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.
- 1Differentiate between synchronous and asynchronous counter. Design a 3-bit synchronous binary counter using T Flip Flop. Draw its timing diagram. (2+8)
- 2Explain De-Morgan's Law. Simply the Boolean function $F(P,Q,R,S)=\Pi(0,1,4,5,11,14,15)$ and $d(P,Q,R,S)=\Sigma(2,3,7,8,9,13)$ using K- Map in both SOP and POS form. (2+8)
- 3Explain design procedure of combinational circuits. Design a combinational circuit with three inputs x, y, and z, and three outputs, A, B, and C as per defined logic. (10)
Group B
Short Answer QuestionsAttempt any Eight questions.
- 4Given A=46 and B=35 represent them in binary and perform A-B using 1's complement method. (5)
- 5What is Multiplexer. Design 8 to 1 Multiplexer with low level Multiplexers. (1+4)
- 6Write about D flip flop with necessary circuit, block diagram, characteristic table and equation. (5)
- 7Simplify $F(A,B,C,D)=\Pi(1,3,4,6,9,11,12,14)$ and realize the equation using NOR gates only. (5)
- 8Mention different types of shift registers. Explain SIPO with timing diagram. (1+4)
- 9What is decoder? Describe the 3 to 8 line decoder circuit. (1+4)
- 10Explain state diagram, state table, state reduction and state assignment with suitable example. (5)
- 11Design a 2 bit asynchronous binary counter using T Flip Flop. Draw its timing diagram (5)
- 12Write short notes on: a) Encoder b) Error detection codes (2x2.5=5)