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Digital Electronics

Digital Electronics
Four ROM chips of 16 × 4 size have their address buses connected together. This system will be of size

 256 × 1
 16 × 16
 32 × 8
 64 × 4

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Digital Electronics
The 1’s complement of 11010111 is

 10101000
 00101000
 10101000
 11101000

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Digital Electronics
The logic expression AB can be implemented by giving the inputs A and B to a two-input

 X-NOR gate
 NAND gate
 NOR gate
 X-OR gate

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Digital Electronics
The decimal equivalent of hexadecimal number “BEED” is

 48,777
 47,877
 none
 48,877

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Digital Electronics
The binary number 10101 is equivalent to decimal number ___________.

19
21
12
27

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Digital Electronics
The voltage levels for positive logic system

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

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