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Q.

Consider two npn transistors as shown in figure. If 0 Volts corresponds to false and 5 Volts correspond to true then the output at C corresponds to

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a

A NAND B

b

A OR B

c

A AND B

d

A NOR B

answer is A.

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Detailed Solution

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In the given circuit if any input A or B will be at high potential +5 V (state–1) then transistor will be in ON state and C will get connected to earth (0 V) so C will be at stable 0. Only when A & B are 0 then C will be at high position (state–1)
Truth table of this circuit will be

A	B	Y
0	0	1
0	1	0
1	0	0
1	1	0

This is Truth table of NAND gate

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