Gibilisco: MCQ in Data Transmission | ECE Board Exam

(Last Updated On: March 16, 2020)

Multiple choice questions in Data Transmission

This is the Multiple Choice Questions (MCQs) in Chapter 26: Data Transmission from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

Practice Exam Test Questions

1. A radio wave has a frequency of 1.55 MHz. The highest modulating frequency that can be used effectively is about:

  • A. 1.55 kHz.
  • B. 15.5 kHz.
  • C. 155 kHz.
  • D. 1.55 MHz.

2. Morse code is a form of:

  • A. Digital modulation.
  • B. Analog modulation.
  • C. Phase modulation.
  • D. dc modulation.

3. An advantage of FSK over simple on-off keying for RTTY is:

  • A. Better frequency stability.
  • B. Higher speed capability.
  • C. Reduced number of misprints.
  • D. On-off keying is just as good as FSK.

4. The maximum AM percentage possible without distortion is:

  • A. 33 percent.
  • B. 67 percent.
  • C. 100 percent.
  • D. 150 percent.

5. If an AM signal is modulated with audio having frequencies up to 5 kHz, then the complete signal bandwidth will be:

  • A. 10 kHz.
  • B. 6 kHz.
  • C. 5 kHz.
  • D. 3 kHz.

6. An AM transmitter using a class-C PA should employ:

  • A. Carrier suppression.
  • B. High-level modulation.
  • C. Lower sideband.
  • D. Single sideband.

7. Which of the following modulation methods is used to send teleprinter data over the phone lines?

  • A. CW.
  • B. SSB.
  • C. AM.
  • D. AFSK.

8. An advantage of SSB over AM is:

  • A. Higher data transmission rate.
  • B. More effective use of transmitter power.
  • C. Greater bandwidth.
  • D. Enhanced carrier wave level.

9. An SSB suppressed carrier is at 14.335 MHz. The voice data is contained in a band from 14.335-14.338 MHz. The mode is:

  • A. AM.
  • B. LSB.
  • C. USB.
  • D. FSK.

10. A spectrum analyzer displays:

  • A. Time as a function of frequency.
  • B. Frequency as a function of time.
  • C. Signal strength as a function of time.
  • D. Signal strength as a function of frequency.

11. The deviation for voice FM signals is usually:

  • A. Plus-or-minus 3 kHz.
  • B. Plus-or-minus 5 kHz
  • C. Plus-or-minus 6 kHz.
  • D. Plus-or-minus 10 kHz.

12. Wideband FM is preferable to narrowband FM for music transmission because:

  • A. Lower frequencies are heard better.
  • B. Spectrum space is conserved.
  • C. The fidelity is better.
  • D. No! Narrowband FM is better for music.

13. In which mode of PM does the pulse level vary?

  • A. PAM.
  • B. PDM.
  • C. PWM.
  • D. PFM.

14. In which PM mode do pulses last for varying times?

  • A. PAM.
  • B. PWM.
  • C. PFM.
  • D. PCM.

15. How many states are commonly used for the transmission of digitized voice signals?

  • A. Two.
  • B. Four.
  • C. Six.
  • D. Eight.

16. In an SSTV signal, the frame time is:

  • A. 1/525 second.
  • B. 1/30 second.
  • C. 1/8 second.
  • D. Eight.
  • D. 8 seconds.

17. The bandwidth of a fax signal is kept narrow by:

  • A. Sending the data at a slow rate of speed.
  • B. Limiting the image resolution.
  • C. Limiting the range of shades sent.
  • D. Using pulse modulation.

18. What is the wavelength of a 21.3-MHz signal?

  • A. 46.2 m.
  • B. 14.1 m.
  • C. 21.0 km.
  • D. 6.39 km.

19. A coaxial cable:

  • A. Keeps the signal confined.
  • B. Radiates efficiently.
  • C. Works well as a transmitting antenna.
  • D. Can pick up signals from outside.

20. An advantage of fiber optics over cable communications is:

  • A. More sensitivity to noise.
  • B. Improved antenna efficiency.
  • C. Higher RF output.
  • D. Simpler and easier maintenance.

Complete List of Multiple Choice Questions from this Book

Check your work.

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