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If a FM signal having modulation index mf is passed through a frequency tripler, then the modulation index of output of frequency tripler is ________
Correct Answer: C — 3mf
Explanation:
A frequency tripler is a frequency multiplier in which an electronic circuit generates an output signal whose output frequency is a harmonic (multiple) of its input frequency. When a FM signal is passed through a frequency tripler, it increases its modulation index 3 times. So the modulation index of output is 3mf.