Digital Electronics Viva Interview Questions with Answers

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Question-1. What is digital electronics?

Answer-1: Digital electronics is a branch of electronics that deals with digital signals, which have discrete values representing binary digits (0s and 1s).

Question-2. What is the fundamental unit of digital information?

Answer-2: The fundamental unit of digital information is a binary digit, or bit, which can have a value of either 0 or 1.

Question-3. What is a logic gate?

Answer-3: A logic gate is an electronic component that performs a specific logical operation on one or more binary inputs to produce a single binary output.

Question-4. Name the basic logic gates.

Answer-4: The basic logic gates are AND, OR, NOT (inverter), NAND, NOR, XOR (exclusive OR), and XNOR (exclusive NOR).

Question-5. What is the truth table of an AND gate?

Answer-5: The truth table for an AND gate shows that the output is high (1) only when all inputs are high; otherwise, the output is low (0).

Question-6. What is the truth table of an OR gate?

Answer-6: The truth table for an OR gate shows that the output is high (1) when at least one input is high; otherwise, the output is low (0).

Question-7. What is the truth table of a NOT gate?

Answer-7: The truth table for a NOT gate shows that it produces the complement of the input, i.e., if the input is 0, the output is 1, and vice versa.

Question-8. What is the difference between a decoder and a demultiplexer?

Answer-8: A decoder is a combinational circuit that converts a binary code into a specific set of output lines, while a demultiplexer is a digital switch that selects one of several input lines and routes it to a single output line based on control inputs.

Question-9. What is a flip-flop?

Answer-9: A flip-flop is a sequential logic circuit that stores one bit of data. It can be in one of two stable states (0 or 1) and can change its state based on control signals.

Question-10. What are the types of flip-flops?

Answer-10: The common types of flip-flops include SR (Set-Reset), D (Data or Delay), JK, and T (Toggle).

Question-11. Explain the operation of an SR flip-flop.

Answer-11: An SR flip-flop has two inputs, S (Set) and R (Reset). When S=1 and R=0, the flip-flop sets to 1. When S=0 and R=1, it resets to 0. When both S and R are 0, the flip-flop maintains its previous state.

Question-12. What is a multiplexer?

Answer-12: A multiplexer is a combinational circuit that selects one of several input data lines and routes it to a single output line based on control inputs.

Question-13. What is the function of a counter in digital electronics?

Answer-13: A counter is a sequential logic circuit that counts the number of clock cycles and generates output patterns based on the count.

Question-14. Differentiate between synchronous and asynchronous counters.

Answer-14: Synchronous counters use a common clock signal to synchronize the state transitions of all flip-flops, while asynchronous counters have flip-flops triggered by the output of preceding flip-flops.

Question-15. What is a binary adder?

Answer-15: A binary adder is a digital circuit that performs addition of binary numbers. The most common type is the full adder, which adds two binary digits along with a carry input from a previous stage.

Question-16. What is a shift register?

Answer-16: A shift register is a sequential logic circuit that stores and shifts data in serial or parallel form. It can shift data either left or right in response to clock pulses.

Question-17. Explain the operation of a JK flip-flop.

Answer-17: A JK flip-flop has three inputs: J (Set), K (Reset), and a clock input. When J=1 and K=0, the flip-flop sets to 1. When J=0 and K=1, it resets to 0. When both J and K are 1, the flip-flop toggles its state.

Question-18. What is a logic family in digital electronics?

Answer-18: A logic family is a set of electronic logic circuits implemented using similar technology, operating principles, and voltage levels. Examples include TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor).

Question-19. Explain the operation of a D flip-flop.

Answer-19: A D flip-flop, also known as a data or delay flip-flop, has a single data input (D) and a clock input. The output Q follows the D input when the clock signal transitions from low to high (rising edge).

Question-20. What is a comparator?

Answer-20: A comparator is a digital circuit that compares two analog voltages and produces an output based on their relative magnitudes. It typically generates a digital output indicating whether one voltage is greater than, equal to, or less than the other voltage.

Frequently Asked Question and Answer on Digital Electronics

Digital Electronics Interview Questions and Answers in PDF form Online

Digital Electronics Questions with Answers

Digital Electronics Trivia MCQ Quiz

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- LED Devices
- PAM PWM PPM Techniques
- Radar
- Cable TV System
- Satellite Receiver
- Satellite Dish Antenna
- Hall Effect Experiment
- Encoder and Decoder
- Digital Electronics
- Analog and Digital Signal Processing
- Control Systems
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- Laplace transform
- AutoCAD
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- BandPass Modulation Techniques
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- Cyclic and Linear Block Codes
- Pulse Code Modulation PCM
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- Signals
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