Amplitude Modulation Chapter 4 Quiz

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

The amplitude, $a(t)$

The frequency, $\omega_c$ (correct)

The phase angle, $\gamma(t)$

None of the above

Which of the following devices is commonly used for amplitude modulation?

Capacitor

Diode (correct)

Operational amplifier

Transistor

If the modulation depth of a double-sideband (DSB) signal is 100%, what is the ratio of the maximum amplitude to the minimum amplitude?

2

0

1

Infinity (correct)

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

Carrier frequency, sidebands, and their harmonics Signup and view all the answers

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

Increasing the carrier frequency Signup and view all the answers

In which application is amplitude modulation commonly used?

Radio broadcasting (AM radio) Signup and view all the answers

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

[ F(𝜔 − 𝜔𝑐 )] + [ F(𝜔 + 𝜔𝑐 )] Signup and view all the answers

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

The modulation depth remains the same Signup and view all the answers

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

Carrier frequency and two sidebands Signup and view all the answers

What is a key application of Amplitude Modulation (AM) in communication systems?

Analog television broadcasting Signup and view all the answers

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

Have a linear input-output relationship Signup and view all the answers

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

Sending multiple signals using a single carrier wave Signup and view all the answers

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

0.3 Signup and view all the answers

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

$\omega_m$ Signup and view all the answers

Which of the following is a common application of Amplitude Modulation (AM)?

Radio broadcasting 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?

All of the above Signup and view all the answers

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

It requires a smaller bandwidth than Double Sideband (DSB) modulation 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?

The carrier amplitude Signup and view all the answers