## Marks 1

A bulb in staircase has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned $$ON$$ and als...

The complete set of only those Logic Gates designated as Universal gates is

The digital circuit using two inverters shown in figure will act as
...

The output of a logic gate is $$''1''$$ when all its inputs are at logic $$''0''.$$ The gate is either

The Boolean expression for the output of the logic circuit shown in figure is
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## Marks 2

$$A,B,C$$ and $$D$$ are input bits, and $$Y$$ is the output bit in the $$XOR$$ gate circuit of the figure below. Which of the following statements abo...

In the figure, as long as $${X_1} = 1$$ and $${X_2} = 1,$$ the output $$Q$$ remains
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A digital circuit which compares two numbers $${A_3}{A_2}{A_1}{A_0},\,\,{B_3}{B_2}{B_1}{B_0}$$ is shown in Fig. To get output $$Y=0,$$ choose one pair...

For the circuit shown in Fig. the Boolean expression for the output $$Y$$ in terms of inputs $$P,$$ $$Q,$$ $$R$$ and $$S$$ is
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For a flip-flop formed from two $$NAND$$ gates as shown in figure. The unusable state corresponds to
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The logic function $$f = \overline {\left( {x.\overline y } \right) + \left( {\overline x .y} \right)} $$ is the same as