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Digital Electronics

Digital Electronics
The 1’s complement of 11010111 is

 10101000
 10101000
 11101000
 00101000

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Digital Electronics
An exclusive NOR gate is logically equivalent to

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

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Digital Electronics
The number of 1 in 8-bit representation of 127 in 2’s complement form is m and that in 1,s complement form is n. What is the value of m:n?

 1:2
 1:1
 2:3
 2:1

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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-OR
 AND
 X-NOR

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Digital Electronics
The effect of stray magnetic field on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are

 Inclined at 30°.
 Perpendicular.
  Parallel.
 Inclined at 60°.

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Digital Electronics
The decimal number 0.246 in binary is

 0.001101
 0.001111
 0.011011
 0.010111

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