Exam-style question
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A diagram shows a carrier wave whose amplitude and frequency both vary in a sinusoidal pattern. Which modulation type is represented?.
- A.Amplitude modulation
- B.Frequency modulation
- C.Phase modulation
- D.Amplitude and frequency modulation
Model answer
What a good answer should say
- Amplitude and frequency modulation
Explanation
Why this works
Evidence: the diagram shows simultaneous amplitude and frequency variations. Interpretation: both parameters vary, indicating a combined AM and FM signal.
Implication: the modulation type is amplitude and frequency modulation. Conclusion: the correct answer is Amplitude and frequency modulation.
Common mistake
No common mistake is linked to this question yet.