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Digital Electronics

Digital Electronics
In Boolean algebra, the bar sign (-) indicates ___________.

OR operation
NOT operation
None of these
AND operation

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Digital Electronics
The resolution of a 12 bit analog to digital converter in percent in

 0.09760.
  0.01220.
 0.04882.
  0.02441.

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Digital Electronics
While using a frequency counter for measuring frequency, two modes of measurement are possible. 1. Period time 2. Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4Mhz the crossover frequency is given by

 8 Mhz
 2 Mhz
 1 Khz
 2 Khz

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Digital Electronics
1s Complement of 11001010 is

 11001001
 00110101
 00110111
 11001011

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Digital Electronics
When will be the output of an AND gate is HIGH if there are three inputs, A, B, and C ?

 A = 0, B = 0, C = 0
 A = 1, B = 0, C = 1
 A = 1, B = 1, C = 1
 A = 1, B = 1, C = 0

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Digital Electronics
A demultiplexer is a

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

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