Q. What is the modulation index for the FM to behave as a narrowband?

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Q. What is the number of significant sidebands produced when the bandwidth of the signal is 24 kHz and the modulating frequency is 3 kHz?

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Q. According to Carson’s rule, what is the bandwidth of the signal with a deviation of 30 kHz and a maximum modulating signal of frequency 5 kHz?

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Q. Which of the following is not a source of noise in FM?

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Q. Which circuit in FM receivers cancels or filters out noise?

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Q. Noise introduces a frequency variation into the signal.

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Q. What is the frequency deviation produced by noise if the signal to noise ratio is 3:1 and modulating frequency is 800 Hz?

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Q. What is the noise to signal ratio if the phase shift introduced by noise is 0.75°?

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Q. What is the frequency deviation produced by noise if the modulating frequency is 400 Hz and the phase difference introduced by noise is 0.43 rad?

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Q. Calculate the phase difference by noise if the Signal to noise ratio is 7:2.

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Q. What is the ratio of the shift produced by the noise to the maximum allowed deviation if the modulating frequency is 300 Hz and the phase shift by noise is 25° and the maximum allowable deviation is 5 kHz?

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Q. What is the signal to noise ratio if the maximum allowable frequency deviation is 4 kHz and the frequency deviation by noise is 156.42 Hz?

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Q. What is the technique in which the high frequency components are amplified more than the low frequency components in FM?

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Q. Which of the following pairs of resistors and capacitors can be used in high pass filters for preemphasis circuits?

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Q. Find the frequency at which the signal enhancement flattens out in preemphasis circuit if R1=50 Ω ,R2=70 Ω and C=0.45 μF.

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