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Avionics Practice Test: Digital Communication Techniques
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Avg score: 0% • Most missed: “Which of the following is not a form of pulse modulation?”
Digital Communication Techniques topics include: Data digital transmission, parallel and serial transmission, data conversion, pulse modulation and digital signal processing. Here are some digital communication techniques: Source coding: A form of communication that is mainly for people, not computers. Programmers should write good code that is easy to understand and modify by others. Digital modulation: A technique employed for efficient communication. It has many advantages over analog modulation, including high noise immunity, available bandwidth, and permissible power. Equalizer: A... Show more
Avionics Practice Test: Digital Communication Techniques
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25 Questions

1. Which of the following is false with respect to pulse position modulation?
2. Which of the following is not an advantage of undersampling?
3. What happens after the signal is passed through the analog to digital converter in a DSP?
4. What type of digital modulation is widely used for digital data transmission?
5. According to the sampling theorem, what is the minimum sampling frequency to retain all the information if the bandwidth of the signal is 20MHz?
6. In parallel communication, if the time interval to transmit one bit is 10μs. What is the time to transmit an 8-bit word?
7. What is the error that occurs when the number of bits is not sufficient enough to represent the analog voltages?
8. Which circuit is used to produce the IF for better selection and filtering?
9. What type of filter is an antialiasing filter?
10. What is the maximum operation frequency that can be used if the settling time is 100ns?
11. Which of the following does not belong to the R-2R converter?
12. Which of the following is false with respect to pulse modulation?
13. What is the alias produced when a signal of 15 MHz is sampled at a rate of 28 MHz?
14. Why can Digital data use time division multiplexing?
15. Which of the following is false with respect to digital data transmission?
16. Sampling an analog signal produces pulse amplitude modulation.
17. Speed of transmission is increased by channel encoding.
18. Which of the following is the fastest type of ADC?
19. Selectivity in a DSP is better than its analog equivalent.
20. The process of using a pulse signal to represent information is called _______
21. What is processing gain?
22. What is the number of error bits that occur for a given number of bits transmitted called?
23. What is the resolution of a sting DAC if the reference voltage is 10V and the number of input bits is 3?
24. Which of the following is a false reason for parallel lines not being used for long distances?
25. The devices that convert serial to parallel and parallel to serial are called?

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