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Digital Electronics

Digital Electronics
NOT gates are to be added to the inputs of which gate to convert it to a NOR gate?

 NAND
 OR
 AND
 X-NOR

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

 1000
 1100
 0011
 1001

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Digital Electronics
To get an excess-3 code from BCD code

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

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Digital Electronics
A binary number system is of base ________

 10
 4
 1
 2

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Digital Electronics
To add two m-bit numbers, the required number of half adder is

 2m-1
 2m-1
 2m
 2m+1

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Digital Electronics
The AND-OR realization of a combinational circuit requires three 3-input AND gates and one 3-input OR gate. This circuit can be designed using

None of these
 four input NAND gates only
 three 3-input OR gates and one 3-input AND gate
 three 3-input NAND gates and one 3-input NOR gate

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