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Digital Electronics

Digital Electronics
Which of the following gates cannot be used as an inverter?

 AND
 X-NOR
 NAND
 NOR

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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
 2:3
 1:2
 2:1

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

 NAND
 X-OR
 AND
 NOR

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Digital Electronics
The voltage levels for negative logic system

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

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Digital Electronics
Boolean algebra is also known as

 Gate algebra
 Switching algebra
 Counting algebra
 Transistor algebra

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Digital Electronics
The difference between the diagram of a NOR and OR gate is

 OR has got a bubble at its output terminal
 NOR has got a bubble at its output terminal
 OR is more oval than NOR
 OR is more squared than NOR

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