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Digital Electronics Important Questions For BCA Students

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                              UNIT – I: Fundamentals of Semiconductor Physics


Short Answer / 2 Marks Questions

Q1.What is the difference between a conductor, semiconductor, and insulator based on energy bands?

Q2. Define intrinsic and extrinsic semiconductors.

Q3. What is a depletion region in a pn-junction diode?

Q4.What happens to a pn-junction diode under forward bias and reverse bias?

Q5. What is the use of a diode as a switch?

Q6. Define transistor and its types.

Q7. What are the three configurations of a BJT?

Q8. Define saturation and cutoff region of a transistor.

Q9.What are Integrated Circuits (ICs)?

Q10.Compare TTL, ECL, and CMOS logic families (any two differences).


Long Answer / 5–10 Marks Questions


Q11. Explain the formation of energy bands in solids and distinguish between conductors, semiconductors, and insulators.

Q12.With a neat diagram, explain the working of a pn-junction diode in forward and reverse bias conditions.

Q13. Explain the operation of a BJT in common emitter (CE) configuration as a switch.

Q14.Discuss the characteristics and advantages of TTL, ECL, and CMOS digital logic families.

Q15. Write short notes on saturated and non-saturated logic.


                            UNIT–II: Logic Gates and Boolean Algebra

Short/Conceptual Questions

Q16. Define the basic logic gates: AND, OR, NOT. Write their truth tables and logic symbols.

Q17. What are universal gates? Explain with truth tables and logic symbols.

Q18.Write the truth table for the XOR gate.

Q19.State Boolean laws and explain with examples.

Q20. State and prove DeMorgan’s theorems.

Q21. Descriptive/Long Questions

Q22. Simplify the given Boolean expressions using Boolean laws.

Q23. Implement a Boolean function using NAND or NOR gates only.

Q24. Derive the truth table and Boolean expression for a XOR gate using basic gates.


                            UNIT–III: MAP Simplification and Combinational Circuits

Short/Conceptual Questions


Q25. What is Karnaugh Map (K-Map)? Why is it used?

Q26. Differentiate between Sum of Products (SOP) and Product of Sums (POS) forms.

Q27. Explain Venn diagram representation of Boolean functions.


 Descriptive/Long Questions

Q29.Simplify the following Boolean expressions using K-Map method (2, 3, or 4 variable examples).

Q30.Design a combinational circuit for a given Boolean function using logic gates.

Q31. Explain the advantages of K-Map simplification over Boolean algebra.


                        UNIT–IV: Sequential Circuits and Applications

Short/Conceptual Questions

Q32. Differentiate between combinational and sequential circuits.

Q33.What is a flip-flop? List different types.

Q34.Write the truth table and characteristic equation for:

Q35. RS flip-flop

Q36. D flip-flop

Q37. JK flip-flop

Q38. T flip-flop

Q39. What is a Master-Slave flip-flop? Why is it used?

Q40.Define shift register and explain its types.

Q41. Define multiplexer and demultiplexer.


Descriptive/Long Questions


Q42. Design a half adder and full adder using logic gates.

Q43. Explain the working of a BCD adder.

Q44. Design a full subtractor circuit.

Q45. Explain the operation of a 4-bit shift register.

Q46. Explain the working of encoder and decoder with examples.

Q47. Write short notes on applications of flip-flops.




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