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Questions (multiple-choice)

Discussion in 'General Technical Questions and Answers' started by CT7AJC, Oct 12, 2017.

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  1. CT7AJC

    CT7AJC Ham Member QRZ Page

    Hello all,

    I have some doubts in the following multiple-choice quesitons. Can you please help me to get the correct answer?


    Thank you!
     

    Attached Files:

  2. SM0AOM

    SM0AOM Ham Member QRZ Page

    Having also a teaching and instructor background, I strongly encourage students to do their own homework.

    It is counterproductive to give out just the correct answers.

    What are your problems with the questions?

    73/
    Karl-Arne
    SM0AOM
     
    Last edited: Oct 12, 2017
    AG6QR likes this.
  3. K8JD

    K8JD Ham Member QRZ Page

    I believe I can answer all but one correctly, not sure what a "Mesh" is , exactly , but it may mean network of componants. The translation to English is a bit foggy.
     
  4. WR2E

    WR2E Ham Member QRZ Page

    I substituted "network" and it seemed to make sense.

    Use "matching" for "adaptation" and it makes even more sense.
     
  5. CT7AJC

    CT7AJC Ham Member QRZ Page

    Hi Karl,

    Thanks for the reply.
    Indeed I have done my own study but I don't have sure about the answers for the questions I attached in my first post.

    For the RC active oscillator question: I'd pick c) as there's a limit on the highest frequency (bandwidth) and fasted edge your op amp can process.
    For the circuit shown: I'd pick c) because of the arrangement of the opamp with the diodes in the feedback loop.
    For the frequency modulation: I'd pick c) because there will be a frequency shift from the carrier due to the modulating signal (message).
    For the class C amplifier: I'd pick d) as the VCO and PLL need to make part of the circuit.
    For the half wave dipole: I'd pick a) as shortening the antenna will make it ressonant at a higher frequency.
    For the RMS question: I'd pick d) because a square wave has harmonics at odd multiples of the fundamental frequency, thus we need 100MHz bandwidth.


    Am I thinking correctly?


    Thanks again
     
  6. CT7AJC

    CT7AJC Ham Member QRZ Page

    Thank you for correcting the terms. Make much more sense!
     
  7. CT7AJC

    CT7AJC Ham Member QRZ Page

    Question updated
     

    Attached Files:

  8. SM0AOM

    SM0AOM Ham Member QRZ Page

    73/
    Karl-Arne
    SM0AOM
     
  9. CT7AJC

    CT7AJC Ham Member QRZ Page

    Many many thanks for the detailed reply SM0AOM! You explained in a quick and pratical way!
    I attach in the original language (portuguese) the question regarding the definition of frequency modulation.

    Even in my native language, I think that this question is not well formulated...
     
  10. CT7AJC

    CT7AJC Ham Member QRZ Page

    File attached
     

    Attached Files:

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