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

 –1.5 V and – 5 V
 5 V and 0 V
 0 V and 5 V
 1 V and -5 V

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Digital Electronics
2421 code is

 non-weighted and non-self-complementing code
 non-weighted self-complementing code
 weighted self-complementing code
 weighted non-self-complementing code

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