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# Analog Communication: Nuclear Quiz 3

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Question 1

A modulating signal has frequency fm and modulation index of 10. Find the bandwidth in case of FM.

Question 2

In FM modulation, when the modulation index increases the transmitted power is

Question 3

Find modulation index of multi-tone modulation FM signal shown modulated with carrier frequency fc?

Question 4

FM broadcast standards specify a maximum deviation of frequency to be equal to 75 kHz and a maximum modulation frequency of 15 kHz. What is the modulation index for FM wave?

Question 5

A modulated signal is given below. Whether the signal is PM or FM? What will be the modulation index() ?

Where m(t) is periodic message signal shown in figure below:

Question 6

An FM signal with modulation index mƒ is passedthrough a frequency tripler. The modulation index ofthe output signal will be

Question 7

Direction: Each of the question consist of two statements, one labelled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answer to these items using the codes given below:
Statement (I): Modulation index of AM is always kept less than 1
Statement (II): Modulation index for FM may be greater than 1

Question 8

The modulation index is doubled in a FM system, the SNR of the system will be

Question 9

Determine the permissible range in maximum modulation index for commercial FM that has 25kHz modulating frequencies.

Question 10

Determine the permissible range in maximum modulation index for commercial FM which has 30Hz to 15kHz modulating frequency.
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