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Digital Electronics

Digital Electronics
Which of the following operations is commutative but not associative?

 AND
 OR
 X-OR
 NAND

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Digital Electronics
How many entries will be in the truth table of a 3 input NAND gate ?

 6
 3
 9
 8

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Digital Electronics
The output of a NOR gate is high

 only when all the inputs are high
 only when all the inputs are low
 only when at least one input is low
 only when at least one input is high

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

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Digital Electronics
11001, 1001 and 111001 correspond to the 2’scomplement representation of the following set of numbers

 -7, -7 and -7 respectively
 -6, -6 and -6 respectively
 25, 9 and 57 respectively
 -25, -9 and -57 respectively

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Digital Electronics
A latch is ________ sensitive

 level
 both level and edge
 None
 edge

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