Frequency Modulation Vs. Amplitude Modulation

Wireless & Mobile Communications

This set of Wireless & Mobile Communications Questions and Answers for Aptitude test focuses on “Frequency Modulation Vs. Amplitude Modulation”.

1. Which is the process of encoding information from a message source in suitable manner for transmission?
a) Modulation
b) Demodulation
c) Encryption
d) Decryption

2. The bandpass signal is called the modulating signal.
a) True
b) False

3. AM signal have all information in ______ of the carrier.
a) Amplitude
b) Magnitude
c) Frequency
d) Power

4. In frequency modulation, the amplitude of modulated carrier signal is ______and its frequency is ______ by the modulating message signal.
a) Constant, constant
b) Varied, constant
c) Constant, varied
d) Varied, varied

5. FM signals have all their information in ______ of the carrier.
a) Amplitude
b) Magnitude
c) Frequency
d) Power

6. Amplitude modulation has ______ relationship between the quality of the received signal and the power of the received signal.
a) No
b) Non linear
c) Constant
d) Linear

7. FM has _______ noise immunity when compared to amplitude modulation.
a) Same
b) Less
c) No
d) Better

8. FM signals are _____ susceptible to atmospheric and impulse noise as compared to AM.
a) Largely
b) Less
c) Not
d) Better

9. Burst noise affects FM systems.
a) True
b) False

10. AM has a modulation index.
a) True
b) False

11. Which of the following is an advantage of AM systems in comparison to FM sysytems?
a) Occupy less bandwidth
b) Superior performance in fading
c) Better noise immunity
d) Not susceptible to impulse noise

12. An FM signal is a ______ envelope signal.
a) Varied
b) Small
c) Large
d) Constant

13. FM uses class______ amplifiers and AM uses class ______ amplifiers.
a) C, C
b) A, C
c) C, A
d) AB, C

14. AM exhibits capture effect characteristics.
a) True
b) False

15. Which of the following is a drawback of FM systems?
a) Burst noise
b) Susceptible to atmospheric noise
c) Wider frequency band
d) Poor performance in fading

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