HomeElectronics Multiple choice question MCQ online testLogic gates MCQ Quiz Logic gates MCQ Quiz Leave a Comment / Electronics Multiple choice question MCQ online test Spread the love /48 0 votes, 0 avg 40 Created on June 20, 2023Digital electronics LOGIC GATES Most important and interesting Questions of digital Logic gates 1 / 48 Category: Logic gates A gate is disabled when its disable input is at logic 0. The gate is a. AND b. NONE OF THESE c. OR d. NOR 2 / 48 Category: Logic gates A gate is enabled when its enable input is at logic 1. The gate is a. NAND b. NOR c. NONE OF THESE d. OR 3 / 48 Category: Logic gates A bubbled NOR gate is equivalent to a a. NOR gate b. NAND gate c. X-OR gate d. AND gate 4 / 48 Category: Logic gates What is the minimum number of two-input NAND gates used to perform the function of 2-input OR gate? a. 3 b. 1 c. 4 d. 2 5 / 48 Category: Logic gates A gate is enabled when its enable input is at logic 0. The gate is a. NOR b. NONE OF THESE c. NAND d. AND 6 / 48 Category: Logic gates The NOR gate can function as a NOT gate if a. one input is set to 1 b. one input is set to 0 c. inputs are left open d. all inputs are connected together 7 / 48 Category: Logic gates What logic function is produced by adding an inverter to each input and output of an OR gate? a. X-OR b. AND c. NAND d. NOR 8 / 48 Category: Logic gates The output of a gate is HIGH if and only if all ts inputs are LOW. it is true for a. X-OR b. NOR c. NAND d. X-NOR 9 / 48 Category: Logic gates The output of a gate is HIGH when at least one of its inputs is LOW. It is true for a. OR b. AND c. NAND d. NOR 10 / 48 Category: Logic gates What logic function is produced by adding inverters to the inputs of an AND gate? a. OR b. X-OR c. NOR d. NAND 11 / 48 Category: Logic gates The output of a logic gate is 1 when all its inputs are at logic 1. The gate is either a. an OR or an X-OR b. an AND or an OR c. a NAND or a NOR d. an AND or a NOR 12 / 48 Category: Logic gates The logic expression AB + Abar.Bbar can be implemented by giving the inputs A and B to a two input. a. NOR gate b. NAND gate c. X-OR gate d. X-NOR gate 13 / 48 Category: Logic gates The output of a NAND gate is low a. only when at least one input is low b. only when all the inputs are low c. only when at least one input is high d. only when all the inputs are high 14 / 48 Category: Logic gates An exclusive NOR gate is logically equivalent to a. X-OR gate followed by an inverter b. NOT gate followed by a NOR gate c. complement of a NOR gate The d. inverter followed by an X-OR gate 15 / 48 Category: Logic gates An X-OR gate gives a high output a. if there are odd number of 1s b. if the decimal value of digital word is even c. for odd decimal value d. if it has even number of 0s 16 / 48 Category: Logic gates An OR gate can be imagined as a. transistors connected in parallel b. switches connected in parallel c. switches connected in series d. transistors connected in series 17 / 48 Category: Logic gates A bubbled OR gate is equivalent to a a. NOR gate b. AND gate c. NAND gate d. X-OR gate 18 / 48 Category: Logic gates The output of a NOR gate is high a. only when all the inputs are high b. only when at least one input is high c. only when all the inputs are low d. (d) only when at least one input is low 19 / 48 Category: Logic gates The number of rows in the truth table of a 4-input gate is a. 16 b. 8 c. 12 d. 4 20 / 48 Category: Logic gates What logic function is produced by adding inverters to the inputs of an OR gate? a. NAND b. AND c. NOR d. X-NOR 21 / 48 Category: Logic gates An AND gate can be imagined as a. transistors connected in parallel b. switches connected in series c. transistors connected in series d. switches connected in parallel 22 / 48 Category: Logic gates A bubbled NAND gate is equivalent to a a. X-OR gate b. NOR gate c. NAND gate d. OR gate 23 / 48 Category: Logic gates An any or all gate is the other name of a. X-NOR gate b. AND gate c. OR gate d. X-OR gate 24 / 48 Category: Logic gates The output of a logic gate is 1 when all its inputs are at logic 0. The gate is either a. an OR or a NAND b. a NAND or a NOR c. an X-OR or an X-NOR d. an AND or an X-NOR 25 / 48 Category: Logic gates What logic function is produced by adding an inverter to each input and output of an AND gate ? a. OR b. NO c. X-OR d. NAND 26 / 48 Category: Logic gates The output of a logic gate is 0 when all its inputs are at logic 1. The gate is either a. NAND or an AND b. an OR or an X-OR c. a NAND or an X-OR d. a NOR or an X-NOR 27 / 48 Category: Logic gates A gate is inhibited when its inhibit input is at logic 1. The gate is a. AND b. NONE OF THESE c. NAND d. OR 28 / 48 Category: Logic gates A bubbled NAND gate is equivalent to a a. NAND gate b. NOR gate c. OR gate d. X-OR gate 29 / 48 Category: Logic gates What is the minimum number of NOR gates required to realize an X-OR gate? a. 3 b. 5 c. 4 d. 6 30 / 48 Category: Uncategorized A combinational circuit can be designed using only a. NAND gates b. OR and X-NOR gates c. AND gates d. OR gates 31 / 48 Category: Logic gates Which of the following gates cannot be used as an inverter? a. NOR b. AND c. NAND d. X-NOR 32 / 48 Category: Logic gates The output of a gate is LOW if and only if all its inputs are HIGH. it is true for a. X-NOR b. AND c. NAND d. NOR 33 / 48 Category: Logic gates The output of a logic gate is 0 when all its inputs are at logic 0.The gate is either a. an OR or an X-OR b. a NAND or an X-OR c. an OR or an X-NOR d. an AND or a NOR 34 / 48 Category: Logic gates The NAND gate can function as a NOT gate if a. all inputs are connected together b. one input is set to 1 c. inputs are left open d. one input is set to 0 35 / 48 Category: Logic gates What is the minimum number of NAND gates required to realize an X-OR gate? a. 5 b. 6 c. 4 d. 3 36 / 48 Category: Logic gates Which of the following gates is known as anticoincidence detector? a. X-NOR gate b. OR gate c. AND gate d. X-OR gate 37 / 48 Category: Logic gates An all or nothing gate is the other name of a. X-OR gate b. AND gate c. OR gate d. X-NOR gate 38 / 48 Category: Logic gates A combinational circuit can be designed using only a. AND gates b. OR and X-NOR gates c. OR gates d. NOR gates 39 / 48 Category: Logic gates NOT gates are to be added to the inputs of which gate to convert it to a NOR gate? a. X-NOR b. OR c. AND d. NAND 40 / 48 Category: Logic gates The most suitable gate for comparing two bits is a. X-OR b. NAND c. AND d. OR 41 / 48 Category: Logic gates X-OR and X-NOR gates can have how many inputs? a. 4 b. any number c. 2 d. 1 42 / 48 Category: Logic gates Which of the following statements is true? a. OR and NOT gates are necessary and sufficient for realization of any logic function. b. NAND gates are not sufficient to realize any logic function c. AND and NOT gates are necessary and sufficient for realization of any logic function d. NOR gates are sufficient to realize any logic function. 43 / 48 Category: Logic gates Which of the following is known as a mod-2 adder? a. NAND gate b. NOR gate c. X-NOR gate d. X-OR gate 44 / 48 Category: Logic gates NOT gates are to be added to the inputs of which gate to convert it to a NAND gate? a. AND b. NOT c. OR d. X-OR 45 / 48 Category: Logic gates What is the logic which controls a stair case light associated with two switches A and B located at the bottom and top of the stair case respectively? a. X-OR b. OR c. X-NOR d. AND 46 / 48 Category: Logic gates The output of a gate is LOW when at least one of its inputs is HIGH. This is true for a. NAND b. NOR c. OR d. AND 47 / 48 Category: Logic gates How many NOR gates are.required to obtain AND operation? a. 3 b. 1 c. 4 d. 2 48 / 48 Category: Logic gates Which of the following gate is known as a coincidence detector? a. X-OR gate b. X-NOR gate c. NAND gate d. 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