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Digital Electronics

Digital Electronics
The complement of a function A is

 A
 Ā
 0
 1

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Digital Electronics
Maximum number in decimal that can be represented by 4 bits (binary) is

 4
 16
 15
 7

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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
 1 Khz
 2 Mhz
 2 Khz

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Digital Electronics
The voltages corresponding to LOW and HIGH levels respectively are given below. Identify the voltages which correspond to negative logic system.

 0 V and 5 V
 1 V and 5 V
 –1.5 V and – 0.5 V
 5 V and 0 V

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Digital Electronics
In digital systems, 1 byte is equal to ________ bit(s).

 4
 8
 1
 2

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Digital Electronics
The maximum positive and negative numbers that can be represented in one’s complement using n-bits are respectively

 +2n-1,-(2n-1-1)
 +(2n-1-1),-2n-1
 +(2n-1-1),-(2n-1-1)
 None of these

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