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The frequency of a FM transmitter withou...

The frequency of a FM transmitter without signal input is called

A

Lower side b and frequency

B

Upper side b and frequency

C

Resting frequency

D

None of these

Text Solution

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The correct Answer is:
c
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Modulation is the phenomenon of superimposing the low audio frequency base band message or information signals ( called the modulation signals) on a high frequency wave (called, the carrier wave). The resultant wave is called the modulated wave, which is transmitted. Read the above passage and answer the following questions: (i) What are the Audio Frequency and Radio Frequency ranges? (ii) Why audio frequency signals, as such cannot be transmitted over long distance? (iii) What does the phenomemom imply in day to day life ?

An audio signal of 15 kHz frequency cannot be transmitted over long distance without modulation because.

The range of frequency of audio signal is _________.

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The efficient transmission of signals is achieved by superimposing electrical audio signals on a high frequency carrier wave (the process is known as modulation). When the amplitude of high frequency carrier wave is changed in accordance with the intensity of modulating signal, it is called amplitude modulation. The extent to which the amplitude of carrier wave is changed by the signal is described by modulation factor. It is given as m="Amplitude change of carrier wave"/"Amplitude of unmodulated carrier wave" Let a carrier wave is represented by V_c=V_c cos omega_ct Let the modulation factor be m, the maximum change in amplitude of carrier wave is mV_c So, modulating signal can be represented as v_m=mV_c cosomega_mt So, the amplitude of modulated wave is =V_c+mV_c cosomega_m t Using this value, the instantaneous voltage of modulated wave is E=V_c cos omega_c t+ (mV_c)/2 cos (omega_c+omega_m)t + (mV_c)/2 cos (omega_c-omega_m ) t The above wave contains three frequencies namely, f_c, f_c+f_m and f_c-f_m . The frequencies f_c+f_m and f_c-f_m are called side band frequencies , USB and LSB respectively. The fraction of total power carried by side band frequencies is

Knowledge Check

  • A: The bandwidth of a modulated signal is 2f_(m) in amplitude modulation, where f_(m) is the frequency of the modulating signal. R: In case of amplitude modulation the frequency of a modulated signal is equal to the frequency of the carrier wave.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false
    D
    If both assertion and reason are false.

  • An audio signal of 15 kHz frequency cannot be transmitted over long distance without modulation because.

    A
    the size of the required anteena would be at least 5 km which is not convenient.
    B
    the audio signal cannot be transmitted through sky waves.
    C
    the size of the required antenna would be at least 20 km, which is not convenient.
    D
    effective power transmitted would be very low, if the size of the antenna is less than 5 km

  • The range of frequency of audio signal is _________.

    A
    0 to 2 KHz
    B
    20 Hz to 20 MHz
    C
    20 Hz to 20 kHz
    D
    20 kHz to 200 kHz
    • A2Z-ELECTROMAGNETIC WAVES AND COMMUNICATION SYSTEM -Section D - Chapter End Test
    1. The frequency of a FM transmitter without signal input is called

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    2. Indicate which one of the following system is digital

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    3. In a communication system, noise is most likely to affect the signal

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    4. An amplitude modulated wave is modulated to 50%. What is the saving in...

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    5. The audio signal used to modulate 60 sin (2pixx10^(6)t) is 15 sin 300 ...

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    6. The total power content of an AM wave is 900 W. For 100% modulation, t...

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    7. In a diode AM- detector, the output circuit consist of R=1 k Omega and...

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    8. Mean optical power launched into an 8 km fibre is 120 muW and mean out...

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    9. A sky wave with a frequency 55 MHz is incident on D-region of earth's ...

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    10. The electromagnetic wave of frequency 2 MHz to 30 MHz are

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    11. Laser light is considered to be coherent because it consists of

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    12. The phenomenon by which light travels in an optical fibres is

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    13. The electron dencity of E, F(1),F(2) layers of ionosphere is 2xx10^(11...

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    14. The impedance of coaxial cable, when its inductance is 0.40 mu H and c...

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    15. Consider telecommunication through optical fibres. Which of the follow...

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    16. Which of the following statement is wrong?

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    17. Pick out the longest wavelength from the following types of radiation

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    18. Wave which cannot travel in vacumm is

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    19. In an electromagnetic wave, the electric and magnetizing field are 100...

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    20. The 21 cm radio wave emitted by hydrogen in interstellar space is due ...

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