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Digital Electronics

Digital Electronics
The number of comparators in a parallel conversion type 8-bit analog to digital converter is

  8.
  255.
 16.
 256.

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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?

 300 mV.
 30 mV.
 90 mV.
 900 mV.

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Digital Electronics
Which of the logical operations is represented by the + sign in Boolean algebra ?

 OR
 NOT
 NAND
 AND

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Digital Electronics
NAND. gates are preferred over others because these

provide maximum density in a chip.
can be used to make any gate
have lower fabrication area
consume least electronic power

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Digital Electronics
An AND gate will function as OR if

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

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Digital Electronics
The NOR gate is OR gate followed by ___________.

None of these
NAND gate
AND gate
NOT gate

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