Digital Electronics Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. Explain the concept of flip-flops in digital circuits.
Flip-flops are digital storage elements used to store binary information. They have two states: 0 and 1.
Ques 2. What is the purpose of a multiplexer?
A multiplexer is used to select one of many input data lines and direct it to a single output.
Ques 3. What is a digital comparator?
A digital comparator compares two binary numbers and produces outputs indicating their relative magnitudes.
Ques 4. Define the terms 'logic high' and 'logic low'.
'Logic high' refers to a high voltage level representing a binary 1, while 'logic low' is a low voltage level representing a binary 0.
Ques 5. What is the purpose of a decoder in digital circuits?
A decoder is used to convert binary information into a specific set of output lines.
Ques 6. What is the purpose of an AND gate in digital circuits?
An AND gate produces a high output only when all of its inputs are high.
Ques 7. How does a full-adder differ from a half-adder?
A full-adder can handle carry input, while a half-adder cannot.
Ques 8. What is the purpose of a register in digital systems?
A register is a group of flip-flops used to store binary information temporarily.
Ques 9. What is the role of an XOR gate in digital circuits?
An XOR gate produces a high output when the number of high inputs is odd.
Ques 10. What is the purpose of a NAND gate in digital circuits?
A NAND gate produces a low output only when all of its inputs are high.
Ques 11. What is the purpose of a digital-to-analog converter (DAC)?
A DAC converts digital signals into analog signals.
Ques 12. Define the term 'combinational logic circuit'.
A combinational logic circuit generates output solely based on the current input, without considering past inputs or states.
Ques 13. Define the term 'edge-triggered' in the context of flip-flops.
Edge-triggered flip-flops change state only on the rising or falling edge of the clock signal, providing synchronization and stability.
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