The symbolic representations of four logic gates are shown below. Identify which ones correspond to $AND$,$NAND$,and $NOT$ gates,respectively.

  • A
    $(ii), (iii)$ and $(iv)$
  • B
    $(iii), (ii)$ and $(i)$
  • C
    $(iii), (i)$ and $(iv)$
  • D
    $(ii), (iv)$ and $(iii)$

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The truth table for the system of four $NAND$ gates as shown in the figure is:

The combination of the gates shown will produce:

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

Input waveforms $A$ and $B$ as shown in Fig-$I$ are applied to the combination of gates as shown in Fig-$II$. Which of the waveforms shown in Fig-$(i)$ to Fig-$(iv)$ correctly represents the output waveform $Y$?

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Which logic gate is represented by the following truth table?
$A$ $B$ $Y$
$1$ $1$ $0$
$0$ $1$ $1$
$1$ $0$ $1$
$0$ $0$ $1$

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