Exam-style question
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EC21: For Digital signal processing, a student is analysing a audio preamplifier input. Which option gives the best Astables reasoning for the objective "Explain duty cycle qualitatively"?.
- A.EC21 correct: In the audio preamplifier input, the answer follows the signal path from input condition to component response to output change, so it supports Explain duty cycle qualitatively.
- B.EC21 distractor: It names a component but does not connect the input condition to the measured output in Astables.
- C.EC21 distractor: It reverses the cause-and-effect chain, so the output is explained before the circuit condition is set.
- D.EC21 distractor: It gives a generic electronics definition without applying the audio preamplifier input context.
Model answer
What a good answer should say
- The correct option is EC21 correct: In the audio preamplifier input, the answer follows the signal path from input condition to component response to output change, so it supports Explain duty cycle qualitatively.
Explanation
Why this works
It is best because it keeps Astables anchored to the circuit signal path: input condition, component response, then output change. The distractors are wrong because they omit the output link, reverse the electronics causality, or drift into a generic component definition rather than applying the audio preamplifier input.
Common mistake
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