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Digital Electronics

Digital Electronics
A + Ā is equal to

 A
 1
 0
 Ā

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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
Which one of the following even parity codes are in errors. (I)100110010 (II)011101010 (III)10111111010001010

 Both (I)&(III)
 Only (II)
 Only (III)
 Both (II)&(III)

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Digital Electronics
A multiplexer is a

 1-to-N device
 1-to-1 device
 N-to-1 device
 N-to-N device

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

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

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Digital Electronics
Which of the following is not a transmission medium?

 Microwave systems.
 Coaxial cables.
  Modem.
 Telephone lines.

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