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Digital Electronics

Digital Electronics
In which of the following codes do the successive characters differ in only 1-bit position?

 binary code
 cyclic code
 8421 code
 2421 code

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Digital Electronics
The voltage levels for positive logic system

 must necessarily be negative
 must necessarily be 0 V and 5 V
 must necessarily be positive
 may be positive or negative

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

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
Many digital computers use NAND gates.

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Digital Electronics
A computer has a word length of 8 bits (including sign). It is required to determine the range of integers that can be stored in the computer. If 2’s complement is used to represent the numbers, then the range will be

 -256 to 256
 -128 to 127
 -128 to 128
 -256 to 255

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Digital Electronics
The binary equivalent of hexadecimal number 4F2D is

 0100 1111 0010 1101
 0100 1111 0010 1100
 0100 1110 0010 1101
 0101 1111 0010 1100

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Digital Electronics
Extremely low power dissipation per gate can be gained from

 ECL ICs
 CMOS ICs
 MOS ICs
 TTL ICs

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