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Digital Electronics

Digital Electronics
AND operation of (79)10 & (-56)10 is

 50H
 42H
 08H
 48H

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Digital Electronics
If two numbers in excess-3 code are added and the result is less than 9, then to get equivalent binary

 0011 is subtracted
 0110 is added
 0011 is added
 0110 is subtracted

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Digital Electronics
What is the logic which controls a stair case light associated with two switches A and B located at the bottom and top of the stair case respectively?

 X-NOR
 AND
 X-OR
 OR

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Digital Electronics
The number of digit 1 present in the binary representation of (3 × 512 + 7 × 64 + 5 × 8 + 3) is

 9
 6
 7
 8

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Digital Electronics
What is the gray code for the binary 101011?

 101011
 011111
 110101
 111110

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Digital Electronics
The main criterion in the design of a digital circuit is reduction of

 volume
 cost
 size
 weight

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