Amplitude Modulation Quiz

Advait is studying communication systems and wants to understand how an amplitude-modulated signal is represented mathematically. What is the equation for an amplitude-modulated signal?

• [Ac+Am cos(wm*t)]cos(wc*t)
• [Ac cos(wc*t)

• [Am+Ac cos(wm*t)]cos(wc*t)

• Am sin (wc*t)

Shreya is studying Amplitude Modulation (AM) in her communications class. She wants to know what the formula for the modulation index (m) in AM is.

Saisha is working on a project where the amplitude of the modulating signal is 5 V and the carrier signal is 10 V. What is the modulation index?

Kavya is studying the total power of an AM signal in her communications class. What is the total power of an AM signal?

• Pt=Pc. (m^2)/2
• Pt=Pc +m

• Pt=Pc [1+(m^2)]/2

• Pt=Pc. (m^2)

5. Which component of an AM signal carries the original information?

• Carrier signal

• Upper and lower sidebands

• Both carrier and sidebands

• None of these

Ria is studying amplitude modulation in her communications class. She needs to know what the formula for carrier power in AM is.

• Pc= Ac/ (2R)

• Pc= Ac*Am / (2R)

• Pc= Am^2 / (2R)

• Pc= Ac^2 / (2R)

If the carrier amplitude is 12 V and the load resistance is 6 Ω, what is the carrier power?

• 12 W

• 24 W

• 6 W

• 144 W

Rohan is studying Amplitude Modulation (AM) in his communications class. He wants to know the total sideband power in AM, which is given by which formula?

• Psb= Pc. (m^2)

• Psb= Pc. ((m^2)/2)

• Psb= Pc. m

• Psb= Pc. ((m)/2)

For a modulation index m=0.75, Riyaan wants to know what is the percentage of modulation?

• 25%

• 50%

• 75%

• 100%

Which of the following statements is true about amplitude modulation?

• The carrier signal contains all the information.

• The modulation index cannot exceed 1 for proper modulation.

• The total power of an AM signal is independent of the modulation index.

• The sidebands are not affected by the modulation process.