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Digital Electronics

Digital Electronics
To get an excess-3 code from BCD code

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

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Digital Electronics
In which of the following base systems is 123 not a valid number?

Base 10
Base 16
Base 8
Base 3

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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 squared than NOR
 OR is more oval than NOR

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Digital Electronics
Which of the following is 1’s complement representation of -34?

 01011101
 11011110
 11011101
 10100010

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Digital Electronics
Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is.

None of these
12 CPS
10 CPS
120 CPS

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Digital Electronics
Which of the following operations is commutative but not associative?

 OR
 NAND
 X-OR
 AND

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