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Digital Electronics

Digital Electronics
The number of Boolean functions that can be generated by n variables is equal to

22n
2n
2n-1
2n

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Digital Electronics
Which of the following codes is known as the 8421 code?

 BCD code
 XS-3 code
 Gray code
 ASCII code

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Digital Electronics
The AND-OR realization of a combinational circuit requires three 3-input AND gates and one 3-input OR gate. This circuit can be designed using

 three 3-input NAND gates and one 3-input NOR gate
 three 3-input OR gates and one 3-input AND gate
None of these
 four input NAND gates only

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Digital Electronics
An AND gate can be imagined as

 switches connected in parallel
 transistors connected in series
 switches connected in series
 transistors connected in paralle

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Digital Electronics
The devices commonly used for making digital circuits are

 contact switches
 semiconductor devices
 mechanical switches
 relays

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Digital Electronics
The voltages corresponding to LOW and HIGH levels respectively are given below. Identify the voltages which correspond to negative logic system.

 –1.5 V and – 0.5 V
 1 V and 5 V
 5 V and 0 V
 0 V and 5 V

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