Discussion
Which arrangement gives the cleanest sine output?
Answer: D
A Wien bridge whose amplitude is regulated by a lamp or a slow control loop never clips, so the output stays a clean sine with distortion in the hundredths of a per cent. A multivibrator and a unijunction produce square and sawtooth waveforms by construction, and a clipping Colpitts carries strong harmonics. The limiting mechanism decides the purity, so a topology plus its amplitude control has to be named together before any distortion figure means anything.
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