Consider two npn transistors as shown in the figure. If 0 Volts… | JEE Main 2013 (9 Apr, Shift 1)

Q166JEE Main 2013 · 9 APR · SHIFT 1Difficult

Logic Gates

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

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Answer: (d)

Both transistors have emitters grounded and collectors joined to C, so they are in parallel between C and ground.
If A or B is 5 V, that transistor saturates and pulls C to about 0 V.
Only when A = B = 0 are both cut off, and C = 5 V through the resistor.
$C = \overline{A + B}$ , so the answer is (d) A NOR B.

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Logic Gates question from JEE Main 2013 (9 Apr, Shift 1)

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