HomeElectronics Multiple choice question MCQ online testCombinational Logic Design MCQ {part2} Combinational Logic Design MCQ {part2} Leave a Comment / Electronics Multiple choice question MCQ online test Share this 0% 0 votes, 0 avg 4 Created on June 12, 2023Digital electronics Combinational Logic Design {part 2} 1 / 24 Category: Combinational Logic Design 1. A device whose inputs are decimal digits and/or alphabetic characters and whose outputs are the coded representations of those inputs is called a) a code converter b) a decode c) an encoder d) a decimal converter 2 / 24 Category: Combinational Logic Design 2. How many full-adders are required to construct an m-bit parallel adder? a) m-1 b) m/2 c) m+ 1 d) m 3 / 24 Category: Combinational Logic Design 3. The minimum number of 2-input NAND/NOR gates required to realize a half-subtractor is a) 3 b) 5 c) 4 d) 6 4 / 24 Category: Combinational Logic Design 4. In a digital system BCD arithmetic is preferred to normal binary arithmetic because a) BCD arithmetic circuits are faster than binary arithmetic circuits b) BCD arithmetic circuits are simpler than binary arithmetic circuits c) BCD arithmetic circuits are less expensive than binary arithmetic circuits d) of ease of operation when input is in BCD format and the output display is decimal 5 / 24 Category: Combinational Logic Design 5. Which of the following logic circuits accepts two binary digits on inputs, and produces two binary digits, a sum bit and a carry bit on its outputs? a) serial adder b) half-adder c) parallel adder d) full-adder 6 / 24 Category: Combinational Logic Design 6. In digital systems subtraction is performed a) using half-adders b) by none of these c) using half-subtractors d) using adders with 1’s complement representation of negative numbers 7 / 24 Category: Combinational Logic Design 7. The adder preferred for applications where circuit minimization is more important than speedis a) half-adder b) parallel adder c) full-adder d) serial adder 8 / 24 Category: Combinational Logic Design 8. The minimum number of 2-input NAND gates required to realize a full adder/full-subtractor is a) 6 b) 5 c) 3 d) 4 9 / 24 Category: Combinational Logic Design 9. In which of the following adder circuits is the carry ripple delay eliminated? a) half-adder b) parallel adder c) carry-look-ahead adder d) full-adder 10 / 24 Category: Combinational Logic Design 10. A parallel adder in which the carry-out of each full-adder is the carry-in to the next significant digit adder is called a a) parallel carry adder b) serial carry adder c) ripple carry adder d) look-ahead-carry adder 11 / 24 Category: Combinational Logic Design 11. A serial adder requires only one a) counter b) multiplexer c) full-adde d) half-adder 12 / 24 Category: Combinational Logic Design 12. Parallel adders are a) combinational logic circuits b) none of these c) Both d) sequential logic circuits 13 / 24 Category: Combinational Logic Design 13. BCD subtraction is performed by using a) 2’s complement representation b) 9’s complement representation c) 1’s complement representation d) S’s complement representation 14 / 24 Category: Combinational Logic Design 14. The logic gate used in parity checkers is a) NAND gate b) NOR gate c) X-NOR gate d) X-OR gate 15 / 24 Category: Combinational Logic Design 15. To secure a higher speed of addition, which of the following is the preferred solution? a) adder with a look-ahead-carry b) parallel adder c) serial adder d) full-adder 16 / 24 Category: Combinational Logic Design 16. The difference output in a full-subtractor is the same as the a) sum output of a full-adder b) difference output of a half-subtractor c) sum output of a half-adder d) carry output of a full-adder 17 / 24 Category: Combinational Logic Design 17. A full-adder can be realized using a) two half-adders, one OR gate b) one half-adder, two OR gates c) two half-adders, two OR gates d) two half-adders, one AND gate 18 / 24 Category: Combinational Logic Design 18. Which logic gate is a basic comparator? a) X-OR gate b) NOR gate c) X-NOR gate d) NAND gate 19 / 24 Category: Combinational Logic Design 19. How many inputs and outputs does a full-adder have? a) two inputs, three outputs b) two inputs, one output c) two inputs, two outputs d) three inputs, two outputs 20 / 24 Category: Combinational Logic Design 20. The minimum number of 2-input NAND/NOR gates required to realize a half-adder is a) 3 b) 6 c) 4 d) 5 21 / 24 Category: Combinational Logic Design 21. How many inputs and outputs does a full-subtractor circuit have? a) three inputs, two outputs b) two inputs, three outputs c) two inputs, one output d) two inputs, two outputs 22 / 24 Category: Combinational Logic Design 22. A logic circuit that responds to just one input, in accordance with some priority system, among those that may be simultaneously high is called a) a priority encoder b) an encode c) a priority decoder d) a decoder 23 / 24 Category: Combinational Logic Design 23. The minimum number of 2-input NOR gates required to realize a full-subtractor is a) 12 b) 8 c) 9 d) 10 24 / 24 Category: Combinational Logic Design 24. In BCD addition, 0110 is required to be added to the sum for getting the correct result, if a) the sum of two BCD numbers is not a valid BCD number b) none of these c) the suni of two BCD numbers is not a valid BCD number or a carry is produced d) a carry is produced Your score isThe average score is 2% LinkedIn Facebook Twitter VKontakte 0% Restart quiz Exit Thank you Send feedback Share this