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Avionics Practice Test: Amplitude & Frequency Modulation
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Avg score: 77% • Most missed: “Which of the following is false with respect to Pulse modulation?”
Amplitude & Frequency Modulation quiz covers these topics: amplitude modulation, modulation index, sidebands, frequency domain, single sideband and phase modulation, fm noise suppression effects and modulation index. Amplitude modulation (AM) and frequency modulation (FM) are two methods of converting data-carrier signals into modulated waves. The main difference between the two is that AM modifies the carrier wave, while FM modifies the carrier wave frequency.  Here are some other differences between AM and FM: Amplitude: In AM, the amplitude of the signal is varied to incorporate sound... Show more
Avionics Practice Test: Amplitude & Frequency Modulation
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25 Questions

1. What is the bandwidth of the signal if the upper sideband frequency and the lower sideband frequency are 7350 KHz and 7210 KHz respectively?
2. What are FM and AM collectively referred together as?
3. What is the instrument that is used to represent the frequency domain of the signal?
4. Why is no carrier signal transmitted when the amplitude of the modulating signal is 0 in an SSB transmission?
5. What type of display will give us clear information on the signal if it is made up of different frequencies?
6. What is it called when an FM signal occupies no more spectrum space than AM signal?
7. What is the ratio of frequency deviation to the modulating frequency is known as?
8. The low power carrier transmitted with SSB signal is called as?
9. SSB transmitters are lighter and require less power than their normal AM transmitters.
10. Which of the following is true with respect to the bandwidth of a 2kHz audio signal and a 2kHz binary data?
11. What is the upper sideband frequency if the carrier frequency and the modulating signal frequency is 30 KHz and 80 Hz respectively?
12. What is the modulation index of a system with modulating frequency 75kHz and maximum frequency deviation 15kHz?
13. Square waves are made up of numerous Fundamental sin waves.
14. Which one of the following is not true with respect to SSB signal?
15. The spectrum space occupied by a DSB signal is the same as that of a conventional AM signal.
16. Which of the following is false with respect to Pulse modulation?
17. The value of a change in frequency of the carrier wave by the modulating signal is called as?
18. According to Carson’s rule, what is the bandwidth of the signal with a deviation of 30kHz and a maximum modulating signal of frequency 5kHz?
19. The type of signal transmission in which no power is wasted on the carrier is known as ________
20. Which of the following is an advantage of SSB over DSB?
21. What is the circuit used for producing AM called?
22. What is the noise to signal ratio if the phase shift introduced by noise is 0.75°?
23. FM and PM are more susceptible to noise than AM signals.
24. The maximum shift in frequency is 3kHz and the minimum and maximum deviation in frequency of the actual signal are 149.97MHz and 150.03MHz. What is the carrier frequency?
25. The frequency of modulating signal has no effect on the amount of frequency deviation of a carrier signal in FM.

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