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In frequency modulation...

In frequency modulation

A

Frequency of audio signal

B

Amplitude of audio signal

C

Both the frequency and amplitude of audio signal

D

None of these

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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 INSTITUTE ENGLISH-COMMUNICATION SYSTEMS -ASSIGNMENT SECTION B Objective (Only one answer)
  1. Which of the following is an advantage of FM over AM?

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  2. The process of changing some characteristic of a carrier wave in accor...

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  3. Modulation is done in

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  4. 'Need for modulation'' arises due to which of the following reasons?

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  5. The area of the region covered by the TV., broadcast by a T.V. tower o...

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  6. A ground receiver station is receiving a signal at 500 MHz transmitted...

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  7. AN information signal of 150MHz is to be sent across a distance of 40k...

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  8. In an AM wave for audio frequency of 3400 cycle/s, the appropriate car...

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  9. For VHF television broadcasting, the frequency employed is generally

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  10. On a particular day the maximum frequency reflected from the lonospher...

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  11. Line of sight (LOS) communication is also known as

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  12. If a carrier wave of 1000 kHz is used to carry the signal, the length ...

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  13. Modem is a device used for

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  14. In frequency modulation

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  15. The communication satellites are parked at a height of (from surface o...

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  16. 3-30 MHz frequency range is known as

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  17. Long distance short-wave radio broadcasting uses

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  18. A photodetector is made from a compound semiconductor with band gap 0....

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  19. What is the range of frequencies used in state satellite communication...

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  20. Digital signals

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