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Digital Electronics

Digital Electronics
Which of the following codes is known as the 8421 code?

 Gray code
 XS-3 code
 ASCII code
 BCD code

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Digital Electronics
When will be the output of a NOT gate is HIGH ?

 the input is HIGH and LOW
 the input is HIGH
 the input is LOW
None of these

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Digital Electronics
Why decoder is used in the digital electronics ?

 To convert non coded information into coded form
 It is used to separate address bus and data bus
None of these
 To convert coded information into non coded form

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

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Digital Electronics
The number of parity bits in a 12-bit Hamming code is

 4
 5
 8
 6

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Digital Electronics
How many NOR gates are required to obtain AND operation?

 4
 2
 3
 1

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