Gibilisco - Wireless Transmitters And Receivers

20 Questions | Attempts: 122
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  • 1/20 Questions

    In which mode of PM does the peak power level of the pulses vary?

    • PAM
    • PDM
    • PIM
    • PFM
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  • 2. 

    Which of the following modes is used to send image data over telephone lines?

    • On/off keying

    • Fax

    • AM

    • Product detection

    Correct Answer
    A. Fax
  • 3. 

    The highest layer of the ionosphere is

    • The D layer.

    • The E layer.

    • The F layer.

    • None of the above.

    Correct Answer
    A. The F layer.
  • 4. 

    Which of the following modes can be demodulated with an envelope detector?

    • AM

    • CW

    • FSK

    • USB

    Correct Answer
    A. AM
  • 5. 

    The bandwidth of a fax signal is kept narrow by

    • Sending the data at a slow rate of speed.

    • Maximizing the number of digital states.

    • Optimizing the range of colors sent.

    • Using pulse modulation.

    Correct Answer
    A. Sending the data at a slow rate of speed.
  • 6. 

    The S/N ratio is a measure of

    • The sensitivity of a receiver.

    • The selectivity of a receiver.

    • The dynamic range of a receiver.

    • The efficiency of a transmitter.

    Correct Answer
    A. The sensitivity of a receiver.
  • 7. 

    A receiver that responds to a desired signal, but not to another signal very close by infrequency, has good

    • Sensitivity.

    • Noise figure.

    • Dynamic range.

    • Selectivity.

    Correct Answer
    A. Selectivity.
  • 8. 

    Frequency sweeping can be used to get a transmitter to produce

    • Spread-spectrum signals.

    • Time division multiplexed signals.

    • Narrowband AM signals.

    • Double sideband, suppressed carrier signals.

    Correct Answer
    A. Spread-spectrum signals.
  • 9. 

    If an AM signal is modulated with audio having frequencies up to 5 kHz, then what is thecomplete signal bandwidth?

    • 10 kHz

    • 20 kHz

    • 50 kHz

    • 500 kHz

    Correct Answer
    A. 10 kHz
  • 10. 

    Suppose an SSB suppressed carrier is at 14.335 MHz, and audio data is contained in a bandfrom 14.335 to 14.338 MHz. What is this mode?

    • DSB

    • LSB

    • USB

    • AFSK

    Correct Answer
    A. USB
  • 11. 

    A continuously variable signal (such as music audio) can be recovered from a signal havingonly a few discrete levels or states by means of

    • A ratio detector.

    • A D/A converter.

    • A product detector.

    • An envelope detector.

    Correct Answer
    A. A D/A converter.
  • 12. 

    Fill in the blank to make the following sentence true: “The reception of can beimproved by the use of DSP.”

    • SSB signals

    • SSTV signals

    • Synchronized communications signals

    • Any of the above

    Correct Answer
    A. Any of the above
  • 13. 

    The reflected wave

    • Arrives in phase with the direct wave.

    • Arrives out of phase with the direct wave.

    • Arrives in a variable phase compared with the direct wave.

    • Is always horizontally polarized.

    Correct Answer
    A. Arrives in a variable phase compared with the direct wave.
  • 14. 

    Fill in the blank in the following sentence to make it true: “The deviation of a narrowbandvoice FM signal normally extends up to either side of the unmodulated-carrier frequency.”

    • 3 kHz

    • 5 kHz

    • 10 kHz

    • 3 MHz

    Correct Answer
    A. 5 kHz
  • 15. 

    A radio wave has a frequency of 1.55 MHz. The highest modulating frequency that can beused effectively is about

    • 1.55 kHz.

    • 15.5 kHz.

    • 155 kHz.

    • 1.55 MHz.

    Correct Answer
    A. 155 kHz.
  • 16. 

    The dynamic range in a superhet is largely influenced by the performance of the

    • Local oscillator.

    • Product detector.

    • Front end.

    • Selectivity in the IF chain.

    Correct Answer
    A. Front end.
  • 17. 

    An advantage of FSK over on/off keying is the fact that FSK

    • Offers better frequency stability.

    • Can provide faster data rates.

    • Reduces the number of receiving errors.

    • Forget it! On-off keying is just as good as FSK.

    Correct Answer
    A. Reduces the number of receiving errors.
  • 18. 

    In which mode are signals intertwined in the time domain at the transmitter, and thenseparated again at the receiver?

    • FDM

    • AFSK

    • PCM

    • None of the above

    Correct Answer
    A. None of the above
  • 19. 

    An FM detector with built-in limiting is

    • A ratio detector.

    • A discriminator.

    • An envelope detector.

    • A product detector.

    Correct Answer
    A. A ratio detector.
  • 20. 

    An LSB, suppressed-carrier signal can be demodulated by

    • An envelope detector.

    • A diode.

    • A ratio detector.

    • A product detector.

    Correct Answer
    A. A product detector.

Quiz Review Timeline (Updated): Mar 21, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 09, 2010
    Quiz Created by
    BATANGMAGALING
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