COMPUTER SCIENCE AND ENGINEERING
COMPUTER ORGANIZATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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NAND Gate
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EXOR Gate
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OR Gate
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None of the above
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Detailed explanation-1: -Detailed Solution. OR-AND gate defined as a + b.c, this gate is NOT universal. Explanation: Universal Logic Gates:-In addition to the NOT, AND, OR, and XOR gates, three more common gates are available.
Detailed explanation-2: -NOT gates can’t be universal, because they only take one input. For a circuit with two inputs constructed entirely of AND gates if the inputs are both off then the output must also be off. Thus, we cannot construct NAND with just and gates. Therefore, AND is not universal.
Detailed explanation-3: -The OR, AND, and NOT are the three basic logic gates as they together can construct the logic circuit for any given Boolean expression. NOR and NAND gates have the property that they individually can be used to hardware-implement any logic circuit. For this reason, the NAND and NOR gates are called universal gates.
Detailed explanation-4: -Among the following, NAND gate is the universal gate.
Detailed explanation-5: -You can’t derive an OR (or AND, NOR, NAND) gate from only XOR (or XNOR) gates, because they are not universal gates.