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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. The system which uses FM for the subcarriers is called _____
2. What is the input signal level that is approximately equal to the average internally generated noise value called?
3. What is the individual carrier frequency of each signal called?
4. For frequency division multiplexing who defines the channel bandwidth?
5. Which circuit does the actual multiplexing process in frequency division multiplexing?
6. A special PCM system uses 16 channels of data, one whose purpose is an identification (ID) and synchronization. The word length is 6 bits. Find the number of bits per frame.
7. ______ is used to provide continuous tuning over the desired range?
8. What type of multiplexing is widely used in cellphones?
9. Frequency multiplier multiplies the frequency deviation produced by the modulator.
10. The LNA of a transducer has failed during the transmission of a signal. Which component’s failure has caused this?
11. A sensitive and selective receiver can be made using only amplifiers, selective filters, and a demodulator.
12. What device is used to demodulate a time division multiplexed analog wave?
13. Serial transmission is not possible without time division multiplexing.
14. In a TDD one channel is sufficient for transmission.
15. All local and long-distance connections are digital.
16. 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.
17. Calculate the transmitter output frequency if the transmitter uses a crystal oscillator with a frequency of 14.9 MHz and a frequency multiplier chain with factors of 2, 3, and 3.
18. What circuit provides the initial selectivity in a receiver?
19. 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.
20. What device is used to prevent power from the transmitter from going to the receiver side?
21. What generates the final carrier frequency?
22. What is the minimum frequency of a 16-MHz crystal with a stability of 200 ppm?
23. Which of the following device is used to demultiplex the received signal?
24. The circuit used to regenerate clock pulses from the transmitted PAM signals is called ____
25. The transmission of data by dots and dashes is an example of ___________

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