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Digital Electronics

Digital Electronics
What is the minimum number of 2 input NAND gates used to perform the function of 2 input OR gate

 3
 1
 4
 2

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

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

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Digital Electronics
The maximum positive and negative numbers that can be represented in one’s complement using n-bits are respectively

 None of these
 +2n-1,-(2n-1-1)
 +(2n-1-1),-(2n-1-1)
 +(2n-1-1),-2n-1

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Digital Electronics
Minimization of logical expressions while designing digital systems helps in reducing

 space requirements
 cost
 power requirements
All of these

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Digital Electronics
What is the gray code for the binary 101011?

 110101
 111110
 011111
 101011

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Digital Electronics
The output of a NAND gate is low

 only when at least one input is high
 only when all the inputs are high
 only when at least one input is low
 only when all the inputs are low

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