# Questions (multiple-choice)

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

Hello all,

Thank you!

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2. ### SM0AOMHam MemberQRZ 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
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3. ### K8JDHam MemberQRZ 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. ### WR2EHam MemberQRZ Page

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

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

5. ### CT7AJCHam MemberQRZ Page

Hi Karl,

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. ### CT7AJCHam MemberQRZ Page

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

7. ### CT7AJCHam MemberQRZ Page

Question updated

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73/
Karl-Arne
SM0AOM

9. ### CT7AJCHam MemberQRZ 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. ### CT7AJCHam MemberQRZ Page

File attached

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