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Digital Electronics

Digital Electronics
NOT gates are to be added to the inputs of which gate to convert it to a NOR gate?

 NAND
 OR
 X-NOR
 AND

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

 9
 3
 8
 6

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Digital Electronics
The number of 1 in 8-bit representation of 127 in 2’s complement form is m and that in 1,s complement form is n. What is the value of m:n?

 1:2
 1:1
 2:1
 2:3

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Digital Electronics
The decimal equivalent of the highest possible address for an 8-bit address bus is

 255
 128
 256
 8

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Digital Electronics
To add two m-bit numbers, the required number of half adder is

 2m+1
 2m-1
 2m-1
 2m

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Digital Electronics
In the toggle mode a JK flip-flop has

 J = 1, K = 1.
 J = 0, K = 0.
 J = 0, K = 1.
 J = 1, K = 0.

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