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Digital Electronics

Digital Electronics
Which of the following is 1’s complement representation of +57

 00111001
 00000001
 01000110
 11000110

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Digital Electronics
A Binary number system has how many digits.

 1
 0
 10
 2

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Digital Electronics
A NAND gate is called a universal logic element because

Many digital computers use NAND gates.
It is used by everybody
All the minization techniques are applicable for optimum NAND gate realization
Any logic function can be realized by NAND gates alone

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

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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 set of which logic gates is designated as universal gate?

 NOT, OR , AND.
 XNOR, NOR, NAND.
 XNOR, NOR, NAND.
  NOR , NAND.

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