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Logic Gates

What are univ...

Question

What are universal gates? Why are they called so ?

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Solution

NAND and NOR gates are called universal gates because they can perform all the three basic logic functions OR, AND and NOT.

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Q. Using truth table of AND gate and NOT gate , show that NAND gate is an AND gate followed by a NOT gate. Hence write the truth table of NAND gate. Why are NAND gates called 'Universal Gates' ?

Q. (a) NAND gates are also called universal gate. Why?
(b) Draw a logic symbol of OR gate.
(c) Write the value of output

y

in the given circuit:
(d) Write the name of the diode used in voltage regulation.

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