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The process of superimposing signal freq...

The process of superimposing signal frequency (i.e., audio wave) on the carrier wave is known as:

A

transmission

B

reception

C

modulation

D

detection

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The correct Answer is:
C
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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 process of separating radio signal from the modulated wave is known as

The process of recovering the audio signal from the modulated wave is known as

One of the components of frequency of amplitude modulated wave (AM) formed by the superposition of message signal of frequency omega_1 on a carrier wave of frequency omega_2 is

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

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. If modulation factor is 100% , the amplitude change of carrier wave is

Assertion: The process of retrieval of information from the carrier wave at the reciever is termed as modulation. Reason: Repeater helps to modulate the signals.

Assertion: AM detection is the process of recovering the modulating signal from amplitude modulated waveform wich is carried out using a rectifier and an evelope detector. Reason: Amplitude modulated waves can be produced by application of the message signal and the carrier wave to a non-linear device followed by band pass filter.

In AM wave, carrier power is given by-

AAKASH SERIES-COMMUNICATION SYSTEM -LECTURE SHEET (LEVEL - I) (MAIN) (EXERCISE - IV) (Straight Objective & More than one Correct Answer Type Questions)
  1. The process of superimposing signal frequency (i.e., audio wave) on th...

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  2. The highest frequency of radiowaves which when sent at some angle towa...

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  3. Speed of electromagnetic waves is the same

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  4. In space communication, the information can be passed from one place t...

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  5. Which one of the following is correct ?

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  6. The space wave propagation is utilized in

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  7. Three waves A,B and C of frequencies 1600 KHz, 5MHz and 60 MHz, respec...

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  8. A transmitter transmits the message in original

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  9. A receiver reconstructs the original message after propagation through...

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  10. A 100m long antenna is mounted on a 500m tall building. The complex ca...

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  11. A diode detector is used to detect an amplitude modulated wave of 60% ...

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  12. The number of telephone conversations by a fibre of band width 40MHz, ...

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  13. Which of the following devices is full duplex?

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  14. Which of the following devices is half duplex ?

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  15. Which of the following statement is wrong?

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  16. Through which mode of propagation the radio waves can be sent from one...

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  17. The maximum peak to peak voltage of an AM wire is 24 mV and the minimu...

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

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  19. The radio waves of frequency 300 MHz to 3000 MHz belong to

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  20. Match the column I with column II.

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  21. Match the following elements of column I with their property given in ...

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