Questionbanks  DCD 
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MODULE1 1. Explain the following decimals in gray code form. (Given any Numerical) 2. Hamming code 3. Convert the following numbers as mentioned against them: Convert to decimal number, Hexadecimal form or Write in Two’s complement form. (Given any Numerical) MODULE2 1. What are universal gates? Why are they called so? Implement XOR and XNOR function using all NAND gates. 2. Use KMap to reduce the following function and then implement it by NOR gates. (Given any Numerical) 3. State and prove DeMorgan’s theorem. 4. Minimize the following expression using Quine McCluskey technique. (Given any Numerical) 5. Using Boolean algebra and DeMorgan’s theorem prove that: (Given any Numerical) Simplify the expression (Given any Value) as much as possible. MODULE3 1. Write truth table of half adder and write VHDL code for half adder.  Module no. 3  (5M) 2. Differentiate between multiplexer and demultiplexer.  Module no. 3  (5M) 3. Draw truth table and logic diagram of full Subtractor using half subtractors and gates.  4. Design 1 digit BCD adder using IC 7438 and perform (Given any Numerical). 5. Implement the following function using 4:1 MUX and NAND gates. (Given any Numerical) 6. VHDL code for fulladder. 7. Implement the following Boolean function using 8:1 multiplexer. (Given any Numerical) 8.Design a 2bit comparator and implement using logic gates. 9. Design BCD adder using the integrated circuit 4 bit binary adders. 10. Hazards. 11. Encoder and decoder 13. Design 3 bit look ahead carry generator circuit. 14. Implement full adder using decoder having active low outputs and gates with fan in 2. 15. Explain parity circuits. 16. Design 8 bit comparator using 4 bit comparator IC 7485 and explain its operations. MODULE4 1. Draw a circuit diagram of 2 input TTL NAND gate and explain the interfacing of TTL and CMOS. 2. Explain the characteristics parameters of logic families. 3. Compare TTL and CMOS logic families 4. Explain current and voltage parameters of logic families MODULE5 1. Analyse the sequential state machine shown in the figure and obtain state diagram for the same. (Given any Diagram) 2. Obtain excitation table for JK flipflop and convert JK flipflop to T flipflop 3. Master slave JK flipflop. 4.Explain use of latch as a switch debouncer. 5.Convert the flip flop (I) JKMS to D flip flop (II) SR to T flip flop. MODULE6 1. Explain advantages and drawbacks of synchronous counter 2. Design a MOD 10 asynchronous counter using T flipflop.  3. Design 4bit Johnson counter using JK flipflop. Explain its working using waveform. 4. Explain ring counter. 5. Analyze the clocked synchronous machine given below. Write excitation equations, excitation/transition table and state output table (Use state names AD for Q1Q2=0011) (Given any Diagram) 6. Explain IC 74194 working in detail with applications. 7. What is shift resistor? Explain any one type of shift resistor. Give its applications. 8. Explain working of 3bit asynchronous counter with proper timing diagram 9. Write differences between synchronous and asynchronous counters. 
