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Question

# Identify the logic operation carried out by the following circuit.

A
AND
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B
NOR
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C
OR
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D
NAND
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Solution

## The correct option is A ANDTruth table of the given circuit is as follows. A B ¯¯¯¯A ¯¯¯¯B Y=¯¯¯¯¯¯¯¯¯¯¯¯¯¯A.¯¯¯¯B 0 0 1 1 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 1 ⇒ The given circuit is equivalent to AND gate. Alternate method: The output Y=¯¯¯¯¯¯¯¯¯¯¯¯¯¯A.¯¯¯¯B According to Morgan's law Y=¯¯¯¯¯¯¯¯¯¯¯¯¯¯A.¯¯¯¯B=¯¯¯¯A+¯¯¯¯B=A.B So, the given circuit is equivalent to AND gate. Hence, (D) is the correct answer.

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