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S.Y.B.Sc. Sem IV Modulation Techniques Solved Numerical

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S.Y.B.Sc. Sem IV Modulation Techniques Solved Numerical

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Questions and Answers

What is the formula to calculate the modulation factor in an AM wave?

m = Vmin / Vmax
m = Vmax / Vmin
m = (Vmax - Vmin) / (Vmax + Vmin) (correct)
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?

0.125
0.25
0.75 (correct)
0.5

Which term represents the amplitude of the signal in an AM wave equation?

Vm
Es (correct)
Vmax
Vmin

If the percentage modulation of an AM wave is 80%, what is the modulation factor?

1.25 (B) Signup and view all the answers

In the context of AM waves, what does the modulation factor of 0 indicate?

No signal present (C) Signup and view all the answers

What happens to the bandwidth of an AM wave when the modulation factor increases?

Bandwidth increases (A) Signup and view all the answers

What is the minimum amplitude of the AM wave according to the given information?

$2$ V (B) Signup and view all the answers

What is the maximum amplitude of the AM wave according to the given information?

$8$ V (B) Signup and view all the answers

What is the modulation coefficient ($m$) of the AM wave according to the given information?

$0.6$ (A) Signup and view all the answers

What is the bandwidth of the AM wave according to the given information?

$4$ KHz (A) Signup and view all the answers

What is the frequency of the lower sideband (LSB) according to the given information?

$335$ KHz (B) Signup and view all the answers

What is the frequency of the upper sideband (USB) according to the given information?

$337$ KHz (C) Signup and view all the answers

What is the expression for the AM wave when the modulation index is 0.75?

$s(t) = 50 [ 1 + 0.75 cos(2\pi t)]cos(100\pi t)$ (C) Signup and view all the answers

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 (D) Signup and view all the answers

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 (C) Signup and view all the answers

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 (D) Signup and view all the answers

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 (A) Signup and view all the answers

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?

$s(t) = 10 \left[ 1 + 0.5 \cos(2\pi \times 10^4 t) \right] \cos(2\pi \times 10^7 t)$ (A) Signup and view all the answers