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For a periodic signal v(t) = 30 sin 100t + 30 cos 300t + 6 sin (500t + π/4), the fundamental frequency in rad/s is

1. 100
2. 300
3. 500
4. 1500

Correct answer: 100

Solution

The fundamental frequency of a periodic signal is determined by the lowest frequency component present in the signal. In this case, the term with the lowest angular frequency is 100 rad/s from the sine function, making it the fundamental frequency.

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