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Digital Electronics

Digital Electronics
Which of the following gates is known as a coincidence detector?

 X-OR gate
 NAND gate
 X-NOR gate
 AND gate

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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 .

 250 Hz.
 2 KHz.
 500 Hz.
  1 KHz.

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Digital Electronics
A gate is disabled when its disable input is at logic 0. The gate is

 NOR
 AND
 OR
 none of these

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Digital Electronics
What is the logic which controls a stair case light associated with two switches A and B located at the bottom and top of the stair case respectively?

 OR
 X-NOR
 X-OR
 AND

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Digital Electronics
What is the gray code for the binary 101011?

 110101
 111110
 011111
 101011

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Digital Electronics
NAND. gates are preferred over others because these

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

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