DIGITAL ELECTRONICS LAB VIVA QUESTIONS
Q.1 What do you mean by Logic Gates?
Q.2 What are the applications of Logic Gates?
Q.3 What is Truth Table?
Q.4 Why we use basic logic gates?
Q.5 Write down the truth table of all logic gates?
Q.6 What do you mean by universal gate?
Q.7 Write truth table for 2 I/P OR, NOR, AND and NAND gate?
Q.8 Implement all logic gate by using Universal gate?
Q.9 Why is they called Universal Gates?
Q.10 Give the name of universal gate?
Q.1 Draw circuit diagram of Half Adder circuit?
Q.2 Draw circuit diagram of Full Adder circuit?
Q.3 Draw Full Adder circuit by using Half Adder circuit and minimum no. of logic
Q.4 Write Boolean function for half adder? Q.5 Write Boolean function for Full
Q.5Design the half Adder & Full Adder using NAND-NAND Logic.
Q.1 Draw circuit diagram of Half Subtractor circuit?
Q.2 Draw circuit diagram of Full Subtractor circuit?
Q.3 Draw Full Subtractor circuit by using Half Subtractor circuit and minimum
no. of logic gate?
Q.4 Write Boolean function for half Subtractor?
Q.5 Write Boolean function for Full Subtractor?
Q.1 What is Excess-3 code? Why it is called Excess-3 code?
Q.2 What is the application of Excess-3 Code?
Q.3 What is ASCII code?
Q.4 Excess-3 code is Weighted or Unweighted?
Q.5 Out of the possible 16 code combination? How many numbers used in Excess-3
Q.1. What is Demorgan’s Law?
Q.2. Show the truth table for Demorgan’s Theorem?
Q.3.What is Minterm & Maxterm?
Q.4. How Minterm can be converted in Max term?
Q.5. What is Hybrid function?
Q.1 What is Flip-Flop?
Q.2 What is Latch circuit?
Q.3 Draw a truth –tables of S-R, J-K, D and T?
Q.4 What is the disadvantages of S-R Flip-Flop?
Q.5 How can you remove the problem of S-R Flip –Flop?
Q.6 Make circuit diagram of S-R, J-K, D and T Flip-Flop?
Q.7 What do you understand by Race Aground condition? How it is over come
in J-K Flip Flop?
Q.1 Explain the principle of Multiplexer?
Q.2 Draw a circuit diagram of 4: 1 Multiplexer?
Q.3 What are the advantages of Multiplexer?
Q.4 What are the disadvantages of Multiplexer?
Q.5 Make the Truth-table of Multiplexer?
Q.1 Explain about Demultiplexer?
Q.2 Draw a circuit diagram of 1: 4 Demultiplexer?
Q.3 Make a logic diagram of 1: 4 Demultiplexer?
Q.4 What is the application of Demultiplexer?
Q.5 What is the difference between Multiplexer and Demultiplexer?
Q.1 Give some application of 555 timers IC?
Q.2 What are the basic elements of a 555 timer IC?
Q.3 Give important features of 555 timer IC?
Q.4 What do you mean by the term duty cycle of an astable multivibrator?
Q.5 For monostable operation of 555 timer IC, what mature of input trigger pulse