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Digital Electronics

Digital Electronics
AND operation of (79)10 & (-56)10 is

 48H
 50H
 08H
 42H

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Digital Electronics
An exclusive NOR gate is logically equivalent to

 complement of a NOR gate
 X-OR gate followed by an inverter
 NOT gate followed by a NOR gate
 inverter followed by an X-OR gate

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Digital Electronics
NAND. gates are preferred over others because these

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

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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

 AND, OR, and NOT
 X-OR
 NOR
 NAND

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Digital Electronics
Consider the following multiplication: (10w1z) × (15)10 = (y01011001)2 Which one of the following gives appropriate values of w,y and z?

 w = 1,y = 1,z = 0
 w = 0,y = 0,z = 1
 w = 1,y = 1,z = 1
 w = 0,y = 1,z = 1

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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.
  1 KHz.
 500 Hz.
 2 KHz.

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