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Digital Electronics

Digital Electronics
What is the minimum number of NAND gates required to realize an X-OR gate?

 5
 4
 3
 6

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Digital Electronics
The most suitable gate to check whether the number of 1s in a digital word is even or odd is

 NAND
 NOR
 X-OR
 AND, OR, and NOT

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Digital Electronics
The decimal equivalent of the highest possible address for an 8-bit address bus is

 255
 256
 128
 8

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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 .

  1 KHz.
 500 Hz.
 250 Hz.
 2 KHz.

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Digital Electronics
Which of the following codes is known as the 8421 code?

 BCD code
 ASCII code
 XS-3 code
 Gray code

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Digital Electronics
The voltage levels for positive logic system

 must necessarily be positive
 must necessarily be 0 V and 5 V
 may be positive or negative
 must necessarily be negative

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