A table which will help to understand behavior of logic gates is known as _______.

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RRB ALP Electronics Mechanic 23 Jan 2019 Official Paper (Shift 3)
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  1. Matrix
  2. Parameter
  3. Gates
  4. Truth table

Answer (Detailed Solution Below)

Option 4 : Truth table
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A table which will help to understand behavior of logic gates is known as truth table. 

Concept:

  • Logic gate: The digital circuit that can be analyzed with the help of Boolean algebra is called a logic gate or logic circuit.
  • logic gate has two or more inputs but only one output.
  • Logic gates work on the truth table.

 

Additional Information 

For Example,

AND Gate: The Logic AND Gate is a digital logic circuit whose output HIGH only when all the inputs are 1 (HIGH) otherwise output will be LOW.

F1 J.K 27.8.20 Pallavi D6

A

B

C = A⋅ B

0

0

0

0

1

0

1

0

0

1

1

1

 

OR Gate: The Logic OR Gate is a digital logic circuit whose output goes HIGH only when any one or more than one of its inputs is HIGH.

F1 J.K 27.8.20 Pallavi D5  

A

B

C = A + B

0

0

0

0

1

1

1

0

1

1

1

1

 

NOT Gate: The Logic NOT Gate is the most basic of all the logic gates and is often referred to as an Inverting Buffer or simply an Inverter.

F1 J.K 27.8.20 Pallavi D4

\(Y = \bar A\)

A

B

0

1

1

0

 

NAND Gate: The logic Gate is obtained after adding NOT Gate after AND Gate.

\(Y = \overline {\left( {A \cdot B} \right)} \)

A

B

0

0

1

0

1

1

1

0

1

1

1

0

 

NOR Gate: The logic Gate is obtained after adding NOT Gate after OR Gate.

\(Y = \overline {\left( {A + B} \right)} \)

A

B

Y

0

0

1

0

1

0

1

0

0

1

1

0

 

F1 J.K 27.8.20 Pallavi D2

F1 J.K 27.8.20 Pallavi D3

XOR Gate: output goes HIGH to a logic level 1 only when both of its inputs are different. If inputs are the same, the output will be LOW '0'.

\(Y = A \cdot \bar B + \bar A \cdot B\)

Truth Table of XOR Gate:

A

B

Y

0

0

0

0

1

1

1

0

1

1

1

0

 

F1 J.K 27.8.20 Pallavi D1

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