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Digital Electronics

Digital Electronics
Which number system has a base of 16

 None
 Hexadecimal
 Decimal
 Octal

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Digital Electronics
For a code to be self-complementing, the sum of all its weights must be

 9
 10
 12
 6

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Digital Electronics
A gate is inhibited when its inhibit input is at logic 1. The gate is

 OR
 NAND
 none of these
 AND

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Digital Electronics
Which of these circuits will give yield carry with more delay 1. Carry look ahead adder 2. Ripple carry adder

 both are same
 2.
 1.
 none

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Digital Electronics
Which one of the following is an invalid state in 8-4-2-1 binary coded decimal counter

 1001
 1100
 1000
 0011

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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

 1 Khz
 2 Mhz
 8 Mhz
 2 Khz

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