Question

Write the names of logic gates related to figure P and table Q.

Answer 1

Hint: Logic gates are the basic building blocks of any digital system. It is an electronic circuit having one or more than one input and only one output. When all the inputs are high then the output is high in an AND gate. If one of the inputs is high then the output is high in an OR gate.

Complete step by step answer:
We are given a figure and a table describing two logic gates and we have to name those logic gates.
In figure P, the given logic gate diagram is of an AND gate.
In an AND gate, when all the inputs are high then only the output will be high.
Input 1 is considered as high, 0 is considered as low.
If the inputs are 0 (low), 0 (low) then the output will be zero (low).
If the inputs are 0 (low), 1 (high) then the output will be zero (low).
If the inputs are 1 (high), 0 (low) then the output will be zero (low).
If the inputs are 1 (high), 1 (high) then the output will be one (high).
The truth table of AND gate is as follows

In the above table, A, B are the inputs and Y is the output. Y’ is the complement of the output Y.
Table Q
The given table is the truth table of the logic gate ‘OR’. The below diagram is of OR gate.

In an OR gate, if one of the inputs is high then the output will be directly high.
If the inputs are 0 (low), 0 (low) then the output will be zero (low).
If the inputs are 0 (low), 1 (high) then the output will be one (high).
If the inputs are 1 (high), 0 (low) then the output will be one (high).
If the inputs are 1 (high), 1 (high) then the output will be one (high).

Note: In an AND gate, the output will be high only when all the given inputs are high whereas in an OR gate, if atleast one of the inputs is high then the output is high. So an AND gate is not an OR gate. Do not confuse an AND gate with an OR gate.