Gibilisco: MCQ in Data Transmission | ECE Board Exam

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.

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⇐ Gibilisco: MCQ in Oscillators | ECE Board Exam

Choose the letter of the best answer in each 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.

Topics Included in the Test from Chapter 19 to Chapter 30

Complete List of Multiple Choice Questions from this Book

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