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Questions and Answers
In amplitude modulation (AM), what property of the sinusoidal signal remains constant?
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?
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?
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?
In a diode amplitude modulator, which of the following frequency components are present in the diode current?
Which of the following is NOT a reason for amplitude modulation?
Which of the following is NOT a reason for amplitude modulation?
In which application is amplitude modulation commonly used?
In which application is amplitude modulation commonly used?
What is the equation representing a special filter used in this type of modulation?
What is the equation representing a special filter used in this type of modulation?
In amplitude modulation, what happens to the modulation depth if the modulating signal is doubled?
In amplitude modulation, what happens to the modulation depth if the modulating signal is doubled?
What are the frequency components present in the diode current in amplitude modulation?
What are the frequency components present in the diode current in amplitude modulation?
What is a key application of Amplitude Modulation (AM) in communication systems?
What is a key application of Amplitude Modulation (AM) in communication systems?
Which of the following is NOT a characteristic of Nonlinear Devices in modulation?
Which of the following is NOT a characteristic of Nonlinear Devices in modulation?
What does Frequency Division Multiplexing (FDM) allow in terms of signal transmission?
What does Frequency Division Multiplexing (FDM) allow in terms of signal transmission?
What is the modulation depth of the DSB-LC (AM) signal given by $\phi_{AM}(t) = \cos\omega_c t + 0.3 \cos\omega_m t\cos\omega_c t$?
What is the modulation depth of the DSB-LC (AM) signal given by $\phi_{AM}(t) = \cos\omega_c t + 0.3 \cos\omega_m t\cos\omega_c t$?
What is the frequency of the envelope of the SSB-LC (AM) modulated signal $\phi_{SSB\pm LC}(t) = \cos\omega_c t + 0.3 \cos\omega_m t\cos\omega_c t - j0.3 \cos\omega_m t\sin\omega_c t$?
What is the frequency of the envelope of the SSB-LC (AM) modulated signal $\phi_{SSB\pm LC}(t) = \cos\omega_c t + 0.3 \cos\omega_m t\cos\omega_c t - j0.3 \cos\omega_m t\sin\omega_c t$?
Which of the following is a common application of Amplitude Modulation (AM)?
Which of the following is a common application of Amplitude Modulation (AM)?
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?
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?
What is the main advantage of using Vestigial Sideband (VSB) modulation for video signal transmission?
What is the main advantage of using Vestigial Sideband (VSB) modulation for video signal transmission?
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?
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?
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