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Digital Electronics

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

 AND
 NAND
 OR
 X-OR

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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

 an AND or a NOR
 an AND or an OR
 an OR or an X-OR
 a NAND or a NOR

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Digital Electronics
A gate is disabled when its disable input is at logic 0. The gate is

 OR
 NOR
 AND
 none of these

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Digital Electronics
2's Complement of 10101011 is

 10101100
 00111100
 10101011
 01010101

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Digital Electronics
The output of a logic gate is 1 when all its inputs are at logic 0. The gate is either

 an X-OR or an X-NOR
 an AND or an X-NOR
 an OR or a NAND
 a NAND or a NOR

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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

 32,767
 32,768
 65,536
 32

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