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Digital Electronics

Digital Electronics
Which one of the following is 2’s complement of -68?

 10111100
 11000100
 00111100
 01111100

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

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

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Digital Electronics
The number of parity bits in a 12-bit Hamming code is

 5
 6
 4
 8

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Digital Electronics
In which of the following base systems is 123 not a valid number?

Base 16
Base 3
Base 10
Base 8

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Digital Electronics
How many bits are required to store one BCD digit ?

 4
 1
 3
 2

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Digital Electronics
The NAND-NAND realization is equivalent to

 OR-AND realization
 AND-NOT realization
 AND-OR realization
 NOT-OR realization

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