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Digital Electronics

Digital Electronics
The number of comparators in a parallel conversion type 8-bit analog to digital converter is

 256.
 16.
  8.
  255.

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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 OR or an X-OR
 an AND or a NOR

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Digital Electronics
The maximum positive and negative numbers which can be represented in two’s complement form using n bits are respectively,

 +2n-1,-2n-1
 +(2n-1-1),-2n-1
 +2n-1,-(2n-1+1)
 +(2n-1-1),-(2n-1-1)

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

 0 and 3
 0 and 4
 1 and 3
 1 and 4

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Digital Electronics
How many input and output required for demultiplexer ?

 one input and many output
None of these
 number of selection inputs and one output
 one input and one output

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Digital Electronics
What are the values of R1 and R2 respectively in the expression (235)R1 = (565)10 = (1065)R2

 16, 8
 12, 8
 8, 16
 6, 16

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