Modulation Techniques Quiz

What happens to the frequency and phase of a carrier signal during amplitude modulation?

• They are both varied.

• They are both kept constant.

• Only frequency is varied.

• Only phase is varied.

In frequency modulation, which parameter of the carrier signal is altered?

• None of the above

• Phase

• Frequency

• Amplitude

What is the role of a modulator in the modulation process?

• To demodulate the received signal

• To filter out noise from the signal

• To alter one parameter of the carrier signal based on the message signal

• To amplify the message signal

How is a message signal mathematically represented?

• M(t) = Ac sin(2πFct + φc)

• M(t) = Ac cos(2πFct + φc)

• M(t) = Am sin(2πFmt)

• M(t) = Am cos(2πFmt)

What does 'Ac' represent in the carrier signal equation C(t) = Ac cos(2πFct + φc)?

• Phase of the carrier signal

• Amplitude of the carrier signal

• Frequency of the message signal

• Amplitude of the message signal