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Digital Electronics

Digital Electronics
In which of the following base systems is 123 not a valid number?

Base 10
Base 3
Base 8
Base 16

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Digital Electronics
Which of the following gates cannot be used as an inverter?

 X-NOR
 NOR
 AND
 NAND

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Digital Electronics
The simplified block diagram of a 10-bit A/D converter of dual slope integrator type is shown in figure. The 10-bit counter at the output is clocked by a 1 Mhz clock. Assuming negligible timing overhead for the control logic, the maximum frequency of the analog signal that can be converted using this A/D converted is approximately .

 500 Hz.
 2 KHz.
  1 KHz.
 250 Hz.

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Digital Electronics
Which circuit is used in between two systems having two different codes

 Both A and B
 Sequential
 Combinational
 Conversion

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Digital Electronics
The most suitable gate for comparing two bits is

 OR
 X-OR
 NAND
 AND

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Digital Electronics
An 8 × 4 ROM contains a decoder of size

 8 × 4
 8 × 8
 3 × 8
 3 × 4

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