What is the ratio of frequency deviation to the modulating frequency is known as?(a) Frequency index(b) Modulating index(c) Modulation index(d) Modulation ratioI have been asked this question in an internship interview.I'd like to ask this question from Frequency, Phase Modulation, Modulation Index and Sidebands in division Amplitude & Frequency Modulation of Avionics

What is the ratio of frequency deviation to the modulating frequency i

1.	What is the ratio of frequency deviation to the modulating frequency is known as?(a) Frequency index(b) Modulating index(c) Modulation index(d) Modulation ratioI have been asked this question in an internship interview.I'd like to ask this question from Frequency, Phase Modulation, Modulation Index and Sidebands in division Amplitude & Frequency Modulation of Avionics
Answer» Correct ANSWER is (c) Modulation INDEX For explanation I would say: The modulation ratio is defined as the ratio of the frequency DEVIATION to that of the modulating frequency. In communication systems using FM techniques, there are LIMITS put on the maximum frequency and the modulation index.

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