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Digital Electronics

Digital Electronics
A switch-tail ring counter is made by using a single D-FF, the following circuit is

  J-K FF.
  D FF.
  S-R FF.
  T FF.

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Digital Electronics
An X-OR gate gives a high output

 if it has even number of 0s
 if there are odd number of 1s
 if the decimal value of digital word is even
 for odd decimal value.

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Digital Electronics
In digital systems, 1 byte is equal to ________ bit(s).

 2
 8
 4
 1

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Digital Electronics
The number of 1 in 8-bit representation of 127 in 2’s complement form is m and that in 1,s complement form is n. What is the value of m:n?

 1:1
 2:1
 2:3
 1:2

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Digital Electronics
Dual slope ADC has R = 1 KΩ and C = 0.22 nanofarad has charging and discharge times for some voltage is 9 ns and 3 ns respectively. The reference Voltage is 2.2 V. What is the peak voltage reached by triangular wave during charging?

 30 mV.
 90 mV.
 900 mV.
 300 mV.

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Digital Electronics
To get an excess-3 code from BCD code

 0011 is added
 0011 is subtracted
 0110 is added
 0110 is subtracted

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