For which of the following gates the output is zero when one or more inputs are zero?

This question was previously asked in
RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
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  1. OR
  2. NOR
  3. NOT
  4. AND

Answer (Detailed Solution Below)

Option 4 : AND
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Detailed Solution

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Types of logic gates

1.) AND Gate

F1 J.K 27.8.20 Pallavi D6

A B Y = AB
0 0 0
1 0 0
0 1 0
1 1 1

When any of the inputs is low, the output is always low.

When all the inputs are high, then only the output is high.

2.) OR gate

F1 J.K 27.8.20 Pallavi D5

A B Y = A+B
0 0 0
1 0 1
0 1 1
1 1 1

When any of the inputs is high, the output is always high.

When all the inputs are low, then only the output is low.

3.) NOR Gate

quesImage4557

A B Y =\(\overline{A+B}\)
0 0 1
1 0 0
0 1 0
1 1 0

When any of the inputs is high, the output is always low.

When all the inputs are low, then only the output is high.

4.) NAND Gate

F1 Shraddha Harshita 20.01.2021 D6

A B Y = \(\overline{AB}\)
0 0 1
1 0 1
0 1 1
1 1 0

When any of the inputs is low, the output is always high.

When all the inputs are high, then only the output is low.

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