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Avionics Practice Test: Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing
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Avg score: 60% • Most missed: “Time division multiplexing: Digital signal:: Frequency division multiplexing:?”

This quiz covers radio transmitters, communication receivers, pulse code modulation, frequency and time division multiplexing.
 

Avionics Practice Test: Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing
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25 Questions

1. A special PCM system uses 16 channels of data, one whose purpose is identification (ID) and synchronization. Find (a) the number of available data channels.
2. Which of the following is not an advantage of using RF amplifiers in the initial stage of signal selection?
3. What is the individual carrier frequency of each signal called?
4. A special PCM system uses 16 channels of data, one whose purpose is an identification (ID) and synchronization. The sampling rate is 3.5 kHz. The word length is 6 bits. Find the serial data rate.
5. Serial transmission is not possible without time division multiplexing.
6. The device that maintains controlled temperature for crystal oscillators are called __________
7. Which of the following is not an advantage of time division multiplexing?
8. In a TDD one channel is sufficient for transmission.
9. The ability to pick up week signals by a receiver is called _________
10. Time division multiplexing: Digital signal:: Frequency division multiplexing:?
11. For frequency division multiplexing who defines the channel bandwidth?
12. Multiplexing increases the number of communication channels for transmission.
13. The transmission of data by dots and dashes is an example of ___________
14. What type of oscillators are used to input a wide range of frequencies to the IF amplifier?
15. Which of the following device was used in early TDM/PAM telemetry systems?
16. What generates the final carrier frequency?
17. Which of the following are the two main characteristics of receivers?
18. What circuit provides the initial selectivity in a receiver?
19. A cable TV service uses a single coaxial cable with a bandwidth of 860 MHz to transmit multiple TV signals to subscribers. Each TV signal is 6 MHz wide. How many channels can be carried?
20. What is the only oscillator capable of meeting the precision and stability demanded by the FCC?
21. Frequency division multiplexing:Frequency slots::time division multiplexing:?
22. Which of the following device is used to demultiplex the received signal?
23. Which of the following is false with respect to PCM?
24. What is the purpose of one shot multivibrator?
25. What type of receivers converts all incoming frequency into a lower frequency for better selectivity and sensitivity?

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