Modulation: DGCA Air Navigation questions

Question 1

The bandwidth produced when a radio frequency (RF) of 4716 kHz is amplitude modulated with an audio frequency (AF) of 6 kHz is:

Accepted Answer

12 kHz

Answer

6 kHz

Answer

3 kHz

Answer

9 kHz

Question 2

Which of the following statements concerning AM is correct?

Accepted Answer

The amplitude of the RF is modified by the amplitude of the AF

Answer

The amplitude of the RF is modified by the frequency of the AF

Answer

The frequency of the RF is modified by the frequency of the AF

Answer

The frequency of the RF is modified by the amplitude of the AF

Question 3

Which of the following is an advantage of single sideband (SSB) emissions?

Accepted Answer

All of the above

Answer

More frequencies available

Answer

Reduced power requirement

Answer

Better signal/noise ratio

Question 4

Which of the following statements concerning FM is correct?

Accepted Answer

The frequency of the RF is modified by the amplitude of the AF

Answer

The amplitude of the RF is modified by the frequency of the AF

Answer

The amplitude of the RF is modified by the amplitude of the AF

Answer

The frequency of the RF is modified by the frequency of the AF