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 Spread the love 0% 0 votes, 0 avg 8 Created on June 12, 2023Digital electronics Combinational Logic Design {part 2} 1 / 24 Category: Combinational Logic Design 1. The minimum number of 2-input NAND/NOR gates required to realize a half-adder is a) 6 b) 3 c) 4 d) 5 2 / 24 Category: Combinational Logic Design 2. The minimum number of 2-input NOR gates required to realize a full-subtractor is a) 10 b) 9 c) 12 d) 8 3 / 24 Category: Combinational Logic Design 3. A serial adder requires only one a) multiplexer b) full-adde c) half-adder d) counter 4 / 24 Category: Combinational Logic Design 4. The minimum number of 2-input NAND gates required to realize a full adder/full-subtractor is a) 4 b) 3 c) 6 d) 5 5 / 24 Category: Combinational Logic Design 5. The minimum number of 2-input NAND/NOR gates required to realize a half-subtractor is a) 4 b) 3 c) 6 d) 5 6 / 24 Category: Combinational Logic Design 6. How many full-adders are required to construct an m-bit parallel adder? a) m b) m+ 1 c) m-1 d) m/2 7 / 24 Category: Combinational Logic Design 7. Parallel adders are a) sequential logic circuits b) none of these c) combinational logic circuits d) Both 8 / 24 Category: Combinational Logic Design 8. BCD subtraction is performed by using a) 9’s complement representation b) 2’s complement representation c) S’s complement representation d) 1’s complement representation 9 / 24 Category: Combinational Logic Design 9. The difference output in a full-subtractor is the same as the a) sum output of a half-adder b) difference output of a half-subtractor c) sum output of a full-adder d) carry output of a full-adder 10 / 24 Category: Combinational Logic Design 10. In a digital system BCD arithmetic is preferred to normal binary arithmetic because a) of ease of operation when input is in BCD format and the output display is decimal b) BCD arithmetic circuits are less expensive than binary arithmetic circuits c) BCD arithmetic circuits are simpler than binary arithmetic circuits d) BCD arithmetic circuits are faster than binary arithmetic circuits 11 / 24 Category: Combinational Logic Design 11. A full-adder can be realized using a) two half-adders, one AND gate b) one half-adder, two OR gates c) two half-adders, two OR gates d) two half-adders, one OR gate 12 / 24 Category: Combinational Logic Design 12. How many inputs and outputs does a full-subtractor circuit have? a) two inputs, two outputs b) three inputs, two outputs c) two inputs, one output d) two inputs, three outputs 13 / 24 Category: Combinational Logic Design 13. 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) look-ahead-carry adder b) parallel carry adder c) serial carry adder d) ripple carry adder 14 / 24 Category: Combinational Logic Design 14. In which of the following adder circuits is the carry ripple delay eliminated? a) carry-look-ahead adder b) half-adder c) parallel adder d) full-adder 15 / 24 Category: Combinational Logic Design 15. The adder preferred for applications where circuit minimization is more important than speed is a) full-adder b) half-adder c) serial adder d) parallel adder 16 / 24 Category: Combinational Logic Design 16. 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) full-adder b) half-adder c) parallel adder d) serial adder 17 / 24 Category: Combinational Logic Design 17. Which logic gate is a basic comparator? a) NAND gate b) X-NOR gate c) X-OR gate d) NOR gate 18 / 24 Category: Combinational Logic Design 18. 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 19 / 24 Category: Combinational Logic Design 19. How many inputs and outputs does a full-adder have? a) two inputs, two outputs b) two inputs, one output c) two inputs, three outputs d) three inputs, two outputs 20 / 24 Category: Combinational Logic Design 20. 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 21 / 24 Category: Combinational Logic Design 21. In digital systems subtraction is performed a) by none of these b) using half-subtractors c) using adders with 1’s complement representation of negative numbers d) using half-adders 22 / 24 Category: Combinational Logic Design 22. The logic gate used in parity checkers is a) NOR gate b) X-OR gate c) X-NOR gate d) NAND gate 23 / 24 Category: Combinational Logic Design 23. 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 decode b) a decimal converter c) an encoder d) a code converter 24 / 24 Category: Combinational Logic Design 24. To secure a higher speed of addition, which of the following is the preferred solution? a) serial adder b) parallel adder c) full-adder d) adder with a look-ahead-carry Your score isThe average score is 15% LinkedIn Facebook VKontakte 0% Restart quiz Exit Thank you Send feedback Spread the love
