Home > CompTIA Security+ Certification > Quizzes > Wireless Communication Systems Practice Test: Modulation Techniques for Mobile Radio
Wireless Communication Systems Practice Test: Modulation Techniques for Mobile Radio
Fast practice, instant feedback. Timer auto-submits when time’s up.
Avg score: 20% Most missed: “Which of the following is specified by a specific number of bit errors occurring…”
Modulation reduces the size of the antenna and attracts low attention.  Some modulation techniques for mobile radio are: Frequency modulation (FM): A popular analog modulation technique used in mobile communications systems. In FM, the amplitude of the modulating carrier is kept constant while its frequency is varied by the modulating message signal. Amplitude modulation (AM): A modulation technique that is used in electronic communication. It is most commonly used for transmitting messages with a radio carrier wave. Quadrature amplitude modulation (QAM): A form of modulation widely used... Show more
Wireless Communication Systems Practice Test: Modulation Techniques for Mobile Radio
Time left 00:00
25 Questions

1. AM has a modulation index.
2. Frequency modulation index defines the relationship between the ______ and bandwidth of transmitted signal.
3. What is the full form of OQPSK?
4. Which of the following is not a property of MSK?
5. QPSK provides twice the bandwidth efficiency and _______ energy efficiency as compared to BPSK.
6. Which of the following is an advantage of AM systems in comparison to FM sysytems?
7. By applying cos(2πft), BPSK signal is equivalent to ________
8. The energy efficiency of DPSK is _________ to coherent PSK.
9. Which of the following is a drawback of FM systems?
10. _______ is equal to width of main spectral lobe.
11. The constellation of M-ary PSK is ____________ dimensional.
12. Which of the following holds true for GMSK?
13. The modulation index of an FSK signal is similar to modulation index of ________
14. Increasing the data rate implies the increase in pulse width of digital symbol.
15. FM has _______ noise immunity when compared to amplitude modulation.
16. Modulation index of an AM signal is ratio of __________ to the _______
17. The bandwidth of OQPSK is _______ to QPSK.
18. AM system use only product detector for demodulation. They never use envelope detectors.
19. Half power bandwidth is also called ______
20. Raised cosine filter does not satisfy Nyquist criteria.
21. The transmission bandwidth of spread spectrum techniques is equal to the minimum required signal bandwidth.
22. Which of the following is true for a Gaussian filter?
23. How is the performance of SSB AM systems in fading channels?
24. Why is pulse shaping technique used?
25. M-ary signalling techniques are not sensitive to timing jitters.