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

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

11.1% of the total power of AM wave

22.2% of the total power of AM wave

33.3% of the total power of AM wave

44.4% of the total power of AM wave

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

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

Fraction of total power carried by the side bands (P_(S)//P_(T)) is given by

The total power content of an AM wave is 2.64 KW at a modulation factor of 80% . The power content of each side band is

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

The modulation index is 0.75. Then the useful power available in the side bands nearly

The tuned circuit the Oscillator in a simple AM transmitter employs a 50mu H coil and a 1 nF capacitor. If the oscillator output is modulated by audio frequencies up to 10m kHz calculate the range occupied by the side bands.

Find the amplitude of side bands in terms of modulation index mu and carrier wave amplitude A_c .

In an amplitude modulation with modulation index 0.5 the ratio of the carrier wave to that of side band in the modulated wave is

AAKASH SERIES-COMMUNICATION SYSTEM -LECTURE SHEET (LEVEL - I) (MAIN) (EXERCISE - III) (Straight Objective & More than one Correct Answer Type Questions)

In AM wave, carrier power is given by-
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In AM wave total power of side bands is given by :
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Fraction of total power carried by side bands is given by-
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Modulation factor determines-
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if the maximum and minimum voltage of AM wave are V(max) and V(min), r...
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When m=1 ,power carried by side bands is:
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Which of the following is/are the limitations of amplitude modulation?
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Degree of modulation-
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A signal wave of frequency 12KHz is modulated with a carrier wave of f...
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The antenna current of an AM transmitter is 8A when only the carrier i...
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Audio sine waves of 3 kHz frequency are used to amplitude modulate a c...
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In amplitude modulation, the modulation index m, is kept less than or ...
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