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# Amplitude Modulation Chapter 4 Quiz

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@SharpestGhost

### In amplitude modulation (AM), what property of the sinusoidal signal remains constant?

The frequency, $\omega_c$

Diode

Infinity

### In a diode amplitude modulator, which of the following frequency components are present in the diode current?

<p>Carrier frequency, sidebands, and their harmonics</p> Signup and view all the answers

### Which of the following is NOT a reason for amplitude modulation?

<p>Increasing the carrier frequency</p> Signup and view all the answers

### What is the equation representing a special filter used in this type of modulation?

<p>[ F(𝜔 − 𝜔𝑐 )] + [ F(𝜔 + 𝜔𝑐 )]</p> Signup and view all the answers

### In amplitude modulation, what happens to the modulation depth if the modulating signal is doubled?

<p>The modulation depth remains the same</p> Signup and view all the answers

### What are the frequency components present in the diode current in amplitude modulation?

<p>Carrier frequency and two sidebands</p> Signup and view all the answers

### Which of the following is NOT a characteristic of Nonlinear Devices in modulation?

<p>Have a linear input-output relationship</p> Signup and view all the answers

### What does Frequency Division Multiplexing (FDM) allow in terms of signal transmission?

<p>Sending multiple signals using a single carrier wave</p> Signup and view all the answers

### What is the modulation depth of the DSB-LC (AM) signal given by $\phi_{AM}(t) = \cos\omega_c t + 0.3 \cos\omega_m t\cos\omega_c t$?

<p>0.3</p> Signup and view all the answers

### What is the frequency of the envelope of the SSB-LC (AM) modulated signal $\phi_{SSB\pm LC}(t) = \cos\omega_c t + 0.3 \cos\omega_m t\cos\omega_c t - j0.3 \cos\omega_m t\sin\omega_c t$?

<p>$\omega_m$</p> Signup and view all the answers

### In a nonlinear device, such as a diode, the current can be expressed as a power series of the applied voltage. Which of the following terms represents the frequency components present in the diode current when an AM signal is applied?

<p>All of the above</p> Signup and view all the answers

### What is the main advantage of using Vestigial Sideband (VSB) modulation for video signal transmission?

<p>It requires a smaller bandwidth than Double Sideband (DSB) modulation</p> Signup and view all the answers

### In the expression for the envelope of the SSB-LC (AM) signal, $r(t) = \sqrt{[A + f(t)]^2 + [\hat{f}(t)]^2}$, what does the term $A$ represent?

<p>The carrier amplitude</p> Signup and view all the answers

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