Design and analysis of combinational circuits MCQ

By: Prof. Dr. Fazal Rehman | Last updated: June 19, 2025

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1. : What is a combinational circuit?



2. : Which of the following is NOT a characteristic of combinational circuits?



3. : What is the primary function of a decoder in a combinational circuit?



4. : What is the main purpose of a multiplexer in combinational logic?



5. : Which gate is commonly used for arithmetic operations in combinational circuits?



6. : What is the truth table for an AND gate with two inputs?



7. : What is the truth table for an XOR gate with two inputs?



8. : Which gate can be used to implement the NOT operation in combinational circuits?



9. : What is the output of an OR gate if both inputs are LOW (0)?



10. : What is the output of a NAND gate if one input is HIGH (1) and the other is LOW (0)?



11. : What is the output of a NOR gate if both inputs are LOW (0)?



12. : Which gate can be used to implement any logic function in combinational circuits?



13. : What is the output of an XOR gate if both inputs are HIGH (1)?



14. : What is the output of an XOR gate if one input is LOW (0) and the other is HIGH (1)?



15. : What is the primary function of a full adder in a combinational circuit?



16. : What is the output of a full adder if the inputs are A = 1, B = 1, and Cin = 1?



17. : Which gate is commonly used in priority encoder circuits?



18. : What is the primary purpose of a priority encoder in a combinational circuit?



19. : Which gate is used for comparison operations in digital circuits?



20. : What is the output of a comparator circuit if A > B?



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