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Digital Electronics

Digital Electronics
Positive integers must be represented by

 None of these
 unsigned number
 signed numbers
 Both A and B

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Digital Electronics
(11011) 2 in BCD 8421 code is

 00011011
 00100111
 01101100
 11011001

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Digital Electronics
A computer has a word length of 8 bits (including sign). It is required to determine the range of integers that can be stored in the computer. If 1’s complement is used to represent the numbers, then the range will be

 -127 to 127
 -256 to 256
 -128 to 127
 -256 to 255

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Digital Electronics
1 kb represents

 1024 bytes
 10,000 bytes
 1000 bytes
 100 bytes

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

 128
 256
 8
 255

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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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