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Digital Electronics

Digital Electronics
What logic function is produced by adding an inverter to each input and output of an AND gate?

 NOR
 X-OR
 OR
 NAND

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Digital Electronics
Choose the option which is not a code conversion standard

 Excess-3 code
 Truth code
 Gray code
 BCD code

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Digital Electronics
For a code to be self-complementing, the sum of all its weights must be

 12
 9
 10
 6

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Digital Electronics
The voltage levels for negative logic system

 must necessarily be positive
 must necessarily be 0 V and –5 V
 may be negative or positive
 must necessarily be negative

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Digital Electronics
What is the difference between xor gate and exor gate.

 xor gives two outputs while exor gives one
 xor gives one output while exor gives two
 xor and exor are complement of each other
 both are same

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Digital Electronics
Which of the following is known as a mod-2 adder?

 X-OR gate
 NOR gate
 NAND gate
 X-NOR gate

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