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Digital Electronics

Digital Electronics
Which of the following operations is commutative but not associative?

 AND
 OR
 NAND
 X-OR

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Digital Electronics
A half adder has

 1 input and 2 outputs
 1 input and 1 output
 2 inputs and 2 output
 2 inputs and 1 outputs

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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

 NOR
 AND, OR, and NOT
 X-OR
 NAND

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Digital Electronics
In Boolean algebra A.A is equal to

 2A
 1
 A²
 A

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

 8 × 4
 3 × 4
 3 × 8
 8 × 8

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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.
 Inclined at 60°.
  Parallel.

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