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Digital Electronics

Digital Electronics
The boolean algebra is mostly based on

 Boolean theorem
 De Morgans theorem
 Standard theorem
 De Morpans theorem

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

 AND
 X-OR
 NOR
 NAND

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Digital Electronics
Which of these circuits have higher gate complexity 1. Carry look ahead adder 2. Ripple carry adder

 both have same
 none
 2
 1

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Digital Electronics
If two numbers in excess-3 code are added and the result is less than 9, then to get equivalent binary

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

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Digital Electronics
The voltages corresponding to LOW and HIGH levels respectively are given below. Identify the voltages which correspond to negative logic system.

 1 V and 5 V
 0 V and 5 V
 –1.5 V and – 0.5 V
 5 V and 0 V

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Digital Electronics
A digital voltmeter has a read out range from 0 to 999 counts, the resolution is

  1 mV.
 1.1 V.
 0.01 V.
 1 V.

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