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Digital Electronics

Digital Electronics
The number of 1 in 8-bit representation of 127 in 2’s complement form is m and that in 1,s complement form is n. What is the value of m:n?

 1:1
 2:1
 2:3
 1:2

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Digital Electronics
NAND. gates are preferred over others because these

provide maximum density in a chip.
have lower fabrication area
can be used to make any gate
consume least electronic power

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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

 four input NAND gates only
None of these
 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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Digital Electronics
The output of a gate is LOW if and only if all its inputs are HIGH. It is true for

 AND
 NAND
 NOR
 X-NOR

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Digital Electronics
An AND gate will function as OR if

Either of the inputs is “1”
All the inputs and outputs are complemente'
All the inputs are ‘0’
All the inputs to the gates are “1”

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Digital Electronics
Which of the following is equivalant to an ODD function

 XOR
 NOR
 AND-NOR
 XNOR

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