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Digital Electronics

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

 Telephone lines.
  Modem.
 Coaxial cables.
 Microwave systems.

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Digital Electronics
A Nibble is equal to ________ bit(s)

 2
 1
 4
 8

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Digital Electronics
(44)8 in BCD 8421 code is

 00110110
 00100100
 01000100
 01100011

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Digital Electronics
The output of a logic gate is 0 when all its inputs are at logic 1. The gate is either

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

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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
 OR is more oval than NOR
 OR is more squared than NOR
 NOR has got a bubble at its output terminal

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Digital Electronics
Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

CMOS
TTLLS
ECL
TTLAS

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