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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 LNA of a transducer has failed during the transmission of a signal. Which component’s failure has caused this?
2. Which of the following is not an advantage of using RF amplifiers in the initial stage of signal selection?
3. What generates the final carrier frequency?
4. What type of oscillators are used to input a wide range of frequencies to the IF amplifier?
5. 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.
6. What is connected between the antenna and the mixer to avoid oscillator radiation?
7. What are used to reduce or stop synchronization problems while receiving?
8. What is the only oscillator capable of meeting the precision and stability demanded by the FCC?
9. Frequency division multiplexing:Frequency slots::time division multiplexing:?
10. Which of the following statements is true with respect to PCM?
11. Which of the following is false with respect to PCM?
12. Which of the following are the two main characteristics of receivers?
13. A sensitive and selective receiver can be made using only amplifiers, selective filters, and a demodulator.
14. Analog signals : Signal to noise ratio:: Digital signals _________
15. In a four channel system, all four signals transmitted contain information.
16. The circuit used to regenerate clock pulses from the transmitted PAM signals is called ____
17. In which of the following systems multiplexing is not necessary?
18. Multiplexing increases the number of communication channels for transmission.
19. The device that maintains controlled temperature for crystal oscillators are called __________
20. Calculate the frequency for maximum drift of crystal if The crystal has a stability of 6300 ppm and an output frequency of 268.2MHz and frequency multiplier chain with factors of 2, 3, and 3.
21. Which circuit does the actual multiplexing process in frequency division multiplexing?
22. What is the input signal level that is approximately equal to the average internally generated noise value called?
23. ______ is used to provide continuous tuning over the desired range?
24. Time division multiplexing: Digital signal:: Frequency division multiplexing:?
25. All local and long-distance connections are digital.

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