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Digital Electronics

Digital Electronics
For 4 bit parallel addition, we need ________ half adder(s) and ________ full adder(s)

 0 and 4
 1 and 3
 0 and 3
 1 and 4

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Digital Electronics
Simplified form of the function f = (x+y+xy)(x+z)

 y+xz
 x+xyz
 x+y
 x+yz

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Digital Electronics
A byte is equal to ________ bits.

 32
 4
 16
 8

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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 1’s complement is used to represent the numbers, then the range will be

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

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Digital Electronics
A full adder has

 3 inputs, 1 output
 2 inputs, 1 output
 2 inputs, 2 outputs
 3 inputs, 2 outputs

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Digital Electronics
The output of a logic gate is 1 when all its inputs are at logic 1. The gate is either

 a NAND or a NOR
 an AND or an OR
 an AND or a NOR
 an OR or an X-OR

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