Q135 / 150 · MHT CET 2022 (08 Aug Shift 1) · Physics

For the following combination of logic gates, when all the three inputs $A$, $B$ and $C$ are first 'high' and then 'low', the output $Y$ will be respectively. Figure

  • A
    0,0
  • Correct answer
    B
    0,1
  • C
    1,0
  • D
    1,1

Solution

Let inputs $A, B$ and $C$ are given to the circuit. Gate-I is AND gate while gate-II is NAND gate. Output $Y=\overline{(A . B . C)}$ When $A=1, B=1, C=1$, then $Y=\overline{(1 \cdot 1) \cdot 1}=\overline{1 \cdot 1}=\overline{1}=0$ When $A=0, B=0, C=0$, then $Y=\overline{(0.0) \cdot 0}=\overline{0.0}=1$

Hence, the correct answer is option: 'B'.

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