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Digital Electronics

Digital Electronics
Which of the following is known as a mod-2 adder?

 X-OR gate
 X-NOR gate
 NAND gate
 NOR gate

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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 Mhz
 1 Khz
 2 Khz

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Digital Electronics
Which of the following is 2’s complement of +12?

 00000011
 00001000
 01110011
 00001100

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Digital Electronics
The decimal equivalent of hexadecimal number of 2A0F is

 17067
 17670
 17607
 10767

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Digital Electronics
A signed integer has been stored in a byte using 2’scomplement format. We wish to store the same integer in 16-bit word. We should copy the original byte to the less significant byte of the word and fill the more significant byte with

 1
 Complement of the MSB of the original byte
 0
 Equal to the MSB of the original byte

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Digital Electronics
What is the minimum number of NAND gates required to realize an X-OR gate?

 5
 6
 4
 3

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