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Digital Electronics

Digital Electronics
In an SR latch built from NOR gates, which condition is not allowed

 S=1, R=0
 S=0, R=1
 S=1, R=1
 S=0, R=0

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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
 NOR
 X-OR
 AND

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Digital Electronics
The output of a logic gate is 0 when all its inputs are at logic 1. The gate is either

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

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Digital Electronics
In Boolean algebra, OR is represented by

 -
 +
 ×
 /

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Digital Electronics
A D-flip-flop is said to be transparent when

 the output is LOW
 the output is HIGH
 the output follow input
 the output follows clock

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Digital Electronics
The voltage levels for negative logic system

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

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