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Digital Electronics

Digital Electronics
Logic circuits are

 none of these
 hybrid circuits
 digital circuits
 analog circuits

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Digital Electronics
Which one of the following is an invalid state in 8-4-2-1 binary coded decimal counter

 1001
 1100
 0011
 1000

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Digital Electronics
The voltages corresponding to LOW and HIGH levels respectively are given below. Identify the voltages which correspond to positive logic system.

 5 V and 0 V
 0 V and 5 V
 –1.5 V and – 5 V
 1 V and -5 V

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

 50H
 42H
 08H
 48H

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Digital Electronics
The largest positive number that can be stored in a computer that has 16-bit word length and uses two’s complement arithmetic is

 32
 32,767
 32,768
 65,536

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

 AND
 OR
 NAND
 X-OR

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