Exam-style question
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EC14: For Data communication systems, a student is analysing a summing amplifier mixer. Which option gives the best Time-division multiplexing reasoning for the objective "Explain why synchronisation is needed"?.
- A.EC14 correct: In the summing amplifier mixer, the answer follows the signal path from input condition to component response to output change, so it supports Explain why synchronisation is needed.
- B.EC14 distractor: It names a component but does not connect the input condition to the measured output in Time-division multiplexing.
- C.EC14 distractor: It reverses the cause-and-effect chain, so the output is explained before the circuit condition is set.
- D.EC14 distractor: It gives a generic electronics definition without applying the summing amplifier mixer context.
Model answer
What a good answer should say
- The correct option is EC14 correct: In the summing amplifier mixer, the answer follows the signal path from input condition to component response to output change, so it supports Explain why synchronisation is needed.
Explanation
Why this works
It is best because it keeps Time-division multiplexing 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 summing amplifier mixer.
Common mistake
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