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Digital Electronics

Digital Electronics
The XS-3 code is a

 weighted code
 self-complementing code
 error-correcting code
 cyclic code

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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.

12 CPS
None of these
10 CPS
120 CPS

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Digital Electronics
Which of these sets of logic gates are designated as universal gates?

 OR, NOT, AND.
 NOR, NAND.
 NOR, NAND, XNOR.
 XOR, NOR, NAND.

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Digital Electronics
When will be the output of an OR gate is LOW ?

 When any input is LOW
 When any input is HIGH
 When all inputs are HIGH
 When all input is LOW

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Digital Electronics
The voltage levels for negative logic system

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

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Digital Electronics
The output of a NAND gate is low

 only when all the inputs are low
 only when at least one input is low
 only when at least one input is high
 only when all the inputs are high

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