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Digital Electronics

Digital Electronics
A demultiplexer is a

 1-to-1 device
 N-to-N device
 N-to-1 device
 1-to-N device

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Digital Electronics
Which of the following gates is known as a coincidence detector?

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

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Digital Electronics
Which circuit is used in between two systems having two different codes

 Both A and B
 Conversion
 Combinational
 Sequential

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Digital Electronics
Which of the following is 1’s complement representation of +57

 00111001
 11000110
 01000110
 00000001

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Digital Electronics
(11011) 2 in BCD 8421 code is

 00011011
 01101100
 11011001
 00100111

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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

 2 Khz
 1 Khz
 2 Mhz
 8 Mhz

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