Virtual Labs

Analog amplitude, frequency and phase modulation and demodulation with spectrum analysis

Which of the following statements is true regarding Amplitude Modulation (AM)?

a: The amplitude of the carrier signal is varied in accordance with the modulating signal. Explanation

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b: The frequency of the carrier signal is varied in accordance with the modulating signal. Explanation

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c: The phase of the carrier signal is varied in accordance with the modulating signal. Explanation

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d: The amplitude of the modulating signal is varied in accordance with the carrier signal. Explanation

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In Frequency Modulation (FM), what parameter of the carrier signal changes with the modulating signal?

a: Amplitude Explanation

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b: Frequency Explanation

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c: Phase Explanation

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d: None of the above Explanation

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What is the main advantage of using Phase Modulation (PM) over Amplitude Modulation (AM)?

a: PM is less susceptible to noise. Explanation

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b: PM requires less bandwidth. Explanation

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c: PM is easier to implement. Explanation

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d: PM has a simpler demodulation process. Explanation

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In which modulation technique does the bandwidth of the signal depend on the amplitude of the modulating signal?

a: Amplitude Modulation (AM) Explanation

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b: Frequency Modulation (FM) Explanation

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c: Phase Modulation (PM) Explanation

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d: None of the above Explanation

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Which of the following correctly describes the relationship between carrier frequency and modulating signal in Amplitude Modulation (AM)?

a: The carrier frequency remains constant. Explanation

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b: The carrier frequency varies with the modulating signal. Explanation

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c: The carrier frequency increases with the modulating signal. Explanation

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d: The carrier frequency decreases with the modulating signal. Explanation

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In Phase Modulation (PM), how is the modulating signal encoded?

a: By varying the amplitude of the carrier signal. Explanation

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b: By varying the frequency of the carrier signal. Explanation

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c: By varying the phase of the carrier signal. Explanation

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d: By varying the power of the carrier signal. Explanation

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What is the primary cause of distortion in an Amplitude Modulated (AM) signal?

a: Noise interference Explanation

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b: Non-linearities in the modulating signal Explanation

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c: High modulation index Explanation

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d: Low carrier frequency Explanation

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What happens to the carrier signal's frequency in Frequency Modulation (FM) when the modulating signal increases in amplitude?

a: It increases in frequency. Explanation

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b: It decreases in frequency. Explanation

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c: It remains constant. Explanation

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d: It increases or decreases depending on the modulating signal. Explanation

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In a Phase Modulated (PM) system, if the frequency of the modulating signal increases, what effect does this have on the phase of the carrier signal?

a: The phase changes more rapidly. Explanation

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b: The phase changes more slowly. Explanation

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c: The phase remains unchanged. Explanation

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d: The phase change becomes unpredictable. Explanation

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What is the significance of the modulation index in Amplitude Modulation (AM)?

a: It determines the efficiency of the AM signal. Explanation

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b: It determines the bandwidth of the AM signal. Explanation

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c: It determines the power of the AM signal. Explanation

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d: It determines the distortion in the AM signal. Explanation

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