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Digital Electronics

Digital Electronics
How many flip flops are required to build a binary counter circuit to count from 0 to 1023?

 24.
  10.
  6.
 12.

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Digital Electronics
A gate is enabled when its enable input is at logic 0. The gate is

 AND
 NOR
 NAND
 none of these

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Digital Electronics
(11011) 2 in BCD 8421 code is

 01101100
 00100111
 00011011
 11011001

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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

 2 Khz
 2 Mhz
 1 Khz
 8 Mhz

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Digital Electronics
An AND gate will function as OR if

All the inputs are ‘0’
All the inputs and outputs are complemente'
All the inputs to the gates are “1”
Either of the inputs is “1”

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Digital Electronics
The 1’s complement of 11010111 is

 10101000
 00101000
 10101000
 11101000

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