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In frequency modulation...

In frequency modulation

A

the amplitude of the modulated wave varies as frequency of the carrier wave

B

the frequency of the modulated wave varies as the amplitude of the modulating wave

C

the amplitude of the modulated wave varies as the amplitude of the carrier wave

D

the frequency of the modulated wave varies as the frequency of the modulating wave

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The correct Answer is:
B
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Define frequency modulation and state any one advantage of frequency modulation (FM) over amplitude modulation (AM).

Both amplitude modulation (AM) and frequency modulation (FM) are used for radio broadcasting. The amplitude of the high frequency carrier wave is varied or modulated in accordance with the variations in the amplitude of the audio signals that are to be transmitted, in te process of amplitude modulation in frequency modulation te amplitude of the carrier remains constant but its frequency is varied inn accordance withh the audio signal. Reception with AM signals is in general is affected by interference of various kinds ad elaborated equipment is required for FM broadcast. In india the radio signals are boarcast using-

Both amplitude modulation (AM) and frequency modulation (FM) are used for radio broadcasting. The amplitude of the high frequency carrier wave is varied or modulated in accordance with the variations in the amplitude of the audio signals that are to be transmitted, in te process of amplitude modulation in frequency modulation te amplitude of the carrier remains constant but its frequency is varied inn accordance withh the audio signal. Reception with AM signals is in general is affected by interference of various kinds ad elaborated equipment is required for FM broadcast. The rangeof a transmitter is

The difference between phase and frequency modulation

Write two advantages of frequency modulation over amplitude modulation.

If f_(0) and f_(f) represent the carrier wave frequencies for amplitude and frequency modulations respectively, then

(A) : In case of frequency modulation, the frequency of the RF carrier is changed by the AF signal and the change is proportional to the amplitude of the AF signal at any instant. (R) : When the AF signal is positive, the carrier frequency increases but it decreases when the AF signal is negative.

An audio signal of 2.8 kHz modulates a carrier of frequency 84 MHz and produces a frequency of deviation of 56kHz. Calculate(i) Frequency modulation index(ii) Frequency range of FM wave.

Match the following {:("(a) Amplitude","(e) Amplitude and angular frequency remains constant"),("(b) Frequency modulation ","(f) Digital transmission"),("(c) Phase modulation","(g) noise creeps in"),("(d) Pulse code modulation","(h) Stereophonic transmission"):}

What should be the transmission bandwidth of an FM signal with 75kHz deviation and highest frequency of modulation 15kHz?

AAKASH SERIES-COMMUNICATION SYSTEM -LECTURE SHEET (LEVEL - I) (MAIN) (EXERCISE - III) (Straight Objective & More than one Correct Answer Type Questions)
  1. Which of following four alternatives is not correct? We need modulatio...

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  2. In frequency modulation

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  3. The frequency of a FM transmitter without signal input is called

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  4. The AM wave of equivalent to the summation of

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  5. The AM wave contans three frequencies viz:

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  6. In AM wave the amplitude of each side hand frequency is

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  7. In AM wave, carrier power is given by-

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  8. In AM wave total power of side bands is given by :

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  9. Fraction of total power carried by side bands is given by-

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  10. Modulation factor determines-

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  11. if the maximum and minimum voltage of AM wave are V(max) and V(min), r...

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  12. When m=1 ,power carried by side bands is:

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  13. Which of the following is/are the limitations of amplitude modulation?

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  14. Degree of modulation-

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  15. A signal wave of frequency 12KHz is modulated with a carrier wave of f...

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  16. The antenna current of an AM transmitter is 8A when only the carrier i...

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  17. A 1kW signal is transmitted using a communication channel which provid...

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  18. A speech signal of 3 KHz is used to modulate a carrier signal of frequ...

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  19. A message signal of frequency omega(m) is superposed on a carrier wave...

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  20. 1-V characteristics of four devices are shown in figure. Identif...

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