Virtual Labs

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

1. 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

Explanation

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

Explanation

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

Explanation

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

Explanation

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

a: Amplitude Explanation

Explanation

b: Frequency Explanation

Explanation

c: Phase Explanation

Explanation

d: None of the above Explanation

Explanation

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

a: PM is less susceptible to noise. Explanation

Explanation

b: PM requires less bandwidth. Explanation

Explanation

c: PM is easier to implement. Explanation

Explanation

d: PM has a simpler demodulation process. Explanation

Explanation

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

a: Amplitude Modulation (AM) Explanation

Explanation

b: Frequency Modulation (FM) Explanation

Explanation

c: Phase Modulation (PM) Explanation

Explanation

d: None of the above Explanation

Explanation

5. 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

Explanation

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

Explanation

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

Explanation

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

Explanation

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

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

Explanation

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

Explanation

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

Explanation

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

Explanation

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

a: Noise interference Explanation

Explanation

b: Non-linearities in the modulating signal Explanation

Explanation

c: High modulation index Explanation

Explanation

d: Low carrier frequency Explanation

Explanation

8. 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

Explanation

b: It decreases in frequency. Explanation

Explanation

c: It remains constant. Explanation

Explanation

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

Explanation

9. 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

Explanation

b: The phase changes more slowly. Explanation

Explanation

c: The phase remains unchanged. Explanation

Explanation

d: The phase change becomes unpredictable. Explanation

Explanation

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

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

Explanation

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

Explanation

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

Explanation

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

Explanation