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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
While using a frequency counter for measuring frequency, two modes of measurement are possible. 1. Period time 2. Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4Mhz the crossover frequency is given by

 8 Mhz
 2 Khz
 2 Mhz
 1 Khz

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Digital Electronics
F’s complement of (2BFD)Hex is

 D402
 D403
 E304
 C403

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Digital Electronics
The inverter is ___________

AND gate
NOT gate
OR gate
None of these

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

 256
 128
 8
 255

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Digital Electronics
A + Ā is equal to

 A
 Ā
 1
 0

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