FREQUENCY MODULATION

What is the purpose of the carrier frequency in frequency modulation?

• To block the information signal

• To amplify the information signal

• To carry the information signal

• To reduce the information signal

Explain the concept of modulating signal in frequency modulation.

• The modulating signal in frequency modulation varies the amplitude of the carrier signal.

• The modulating signal in frequency modulation varies the phase of the carrier signal.

• The modulating signal in frequency modulation has no effect on the carrier signal.

• The modulating signal in frequency modulation varies the frequency of the carrier signal.

Define frequency deviation and its significance in frequency modulation.

• Maximum difference between the carrier frequency and the instantaneous frequency of the modulated signal

• The phase difference between the carrier frequency and the modulated signal

• The amplitude of the modulated signal

• The average frequency of the modulated signal

How is modulation index calculated in frequency modulation?

• Frequency deviation divided by modulating frequency

• Frequency deviation plus modulating frequency

• Frequency deviation minus modulating frequency

• Modulating frequency multiplied by frequency deviation

What are sidebands in the context of frequency modulation?

• The main carrier frequency

• The phase shift caused by modulation

• Frequency components resulting from the modulation process.

• The amplitude of the modulating signal

Why is the choice of carrier frequency important in frequency modulation?

• It has no impact on the modulated signal

• It only affects the color of the modulated signal

• It determines the amplitude of the modulated signal

• It determines the bandwidth of the modulated signal and affects the efficiency of the modulation process.

Discuss the relationship between modulating signal and frequency deviation in frequency modulation.

• The modulating signal has no effect on the frequency deviation in frequency modulation.

• Frequency deviation is inversely proportional to the modulating signal.

• Frequency deviation is determined by the phase of the modulating signal.

• The amplitude of the modulating signal directly affects the frequency deviation of the carrier signal.

What is the impact of modulation index on the quality of frequency modulation?

• Lower modulation index improves the quality of frequency modulation.

• Higher modulation index improves the quality of frequency modulation.

• Modulation index has no impact on the quality of frequency modulation.

• Modulation index directly affects the quality of frequency modulation.

How does frequency modulation differ from amplitude modulation in terms of sideband generation?

• Frequency modulation generates sidebands by varying the frequency of the carrier signal.

• Amplitude modulation generates sidebands by varying the amplitude of the carrier signal.

• Frequency modulation does not generate any sidebands.

• Frequency modulation generates sidebands by varying the phase of the carrier signal.

Indicate which one of the following is not an advantage of FM over AM:

• Better noise immunity is provided

• Lower bandwidth is required

• The transmitted power is more useful

• Less modulating power is required