18 Questions
What is the formula to calculate the modulation factor in an AM wave?
m = (Vmax - Vmin) / (Vmax + Vmin)
In an AM wave, if the peak-to-peak voltage is 16 mV and the minimum voltage is 2 mV, what is the modulation factor?
0.75
Which term represents the amplitude of the signal in an AM wave equation?
Es
If the percentage modulation of an AM wave is 80%, what is the modulation factor?
1.25
In the context of AM waves, what does the modulation factor of 0 indicate?
No signal present
What happens to the bandwidth of an AM wave when the modulation factor increases?
Bandwidth increases
What is the minimum amplitude of the AM wave according to the given information?
$2$ V
What is the maximum amplitude of the AM wave according to the given information?
$8$ V
What is the modulation coefficient ($m$) of the AM wave according to the given information?
$0.6$
What is the bandwidth of the AM wave according to the given information?
$4$ KHz
What is the frequency of the lower sideband (LSB) according to the given information?
$335$ KHz
What is the frequency of the upper sideband (USB) according to the given information?
$337$ KHz
What is the expression for the AM wave when the modulation index is 0.75?
$s(t) = 50 [ 1 + 0.75 cos(2\pi t)]cos(100\pi t)$
For an AM signal with a carrier frequency of 1 MHz and a modulating signal frequency of 100 kHz, what are the frequencies of the upper and lower sidebands?
Upper sideband: 1.1 MHz, Lower sideband: 900 kHz
What is the modulation index of an AM signal with a carrier amplitude of 10 V and a modulating signal amplitude of 3 V?
0.3
What is the bandwidth of an AM signal with a carrier frequency of 10 MHz and a modulating signal frequency of 10 kHz?
20 MHz
What is the peak amplitude of the upper and lower sidebands in an AM signal with a carrier amplitude of 10 V and a modulation index of 0.3?
1.5 V
What is the expression for the AM wave when the carrier frequency is 10 MHz, the modulating signal frequency is 10 kHz, and the modulation index is 0.5?
$s(t) = 10 \left[ 1 + 0.5 \cos(2\pi \times 10^4 t) \right] \cos(2\pi \times 10^7 t)$
Test your understanding of modulation techniques with this solved numerical quiz unit. Explore topics like the modulation factor in AM waves and calculate signal amplitudes. Prepared by Prof. Vishwas Deshmukh from Rizvi College of Arts, Science & Commerce.
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